This is exactly the video that I needed! I had a bad relay, replaced it, and now my fan works! 1960 Thunderbird with an electric fan in addition to the stock fan.
This is the most useful video showing me all the details related to auxiliary fans, wiring kit, and the most useful part "relay" Thank you so much for this video.
Excellent explanation , Need to control Fan on my Car, temp. here in Mozambique soar to +35-38 deg C, Cannot wait for the fan to kick-in.... Thank You very much !!!
Okay Thanks so Much! So which prong on a relay would be for which component of the curcuit? I want to wire a thermal switch(activates at 40°C) to my intercooler and a manual switch in the cockpit. Also since im using switches do i need to use ny ignition source for 12V or can i run straight to my battery since the relay is relying on the two switches that would be "Control the ground" right? This video explains it all better than the other one hundred that I have come across (7yrs looking) but i really need these answers so that it can finally make complete sense of what I need to do. Also you displayed a 4 prong and a 5 prong, which one would benifit me the most. I also believe there are at least two differnet configurations of 5 prong relays (center prong being 86a or 86b etc.)
A lot of great information. But how would I wire a push through radiator temperature probe? Is it one wire lead to 85 And one to ground? OR One lead to 85 terminal One lead to and ignition source? Thanks for your help!
Good job ! I was trying to explaine to my brother about the relay function and I did'nt sound to convincing . you made it sound more convincing and easy to understand . Now if I could just get my headlight's to work ???
THANKS FOR RESPONDING... A FRIEND OF MINE WENT THROUGH AND DETERMINED THAT THE CIRCUIT BREAKER, THAT CAME WITH THE THERMOSTAT WIRING KIT, WAS THE PROBLEM... HE REPLACED IT WITH AN INLINE FUSE... PROBLEM SOLVED...
I like that the fan is automatic, but just putting a switch in isn't dangerous unless you don't use the proper gauge of wire... turning the switch off means the circuit is open and no voltage gets anywhere if the wind spins the fan a bit. I do like how you explain everything. I always thought of relays as a weight saver when it comes to wire cause it just relays the signal to a heavier wire, but obviously it's more complicated than that if they do other things, like wiper relays and fan relays.
I am using the AAW Camaro kit for the 69 camaro. Is the orange wire to the fan intended to be the ground switch for the fan to signal it to turn on? Its unclear what the function of this wire is. I have the Dakota digital dash too.
Juan Abreu The diode across the relay coil is to block any back pulse created when the relay turns off to prevent damage to a transistor switch if used its not a "freewheeling" diode.
Thank you for this video. But what if the relay has a malfunction? Then the override switch wont complete the circuit. So it has to be either the hot or the cold direct wire that supply the fan to be connected to the override switch.
great job! only question i have is? shouldnt you have a second "free wheeling" diode right close to the fan motor? wouldnt there be voltage feedback with on the freeway??. without one? larry
Hi. Great video. Can i install an electric fan using the temp sensor on the engine. Or do i have to install a separate sensor switch. The temp sensor has 2wires. I want to retrofit to electric fan
I did a fan on my jeep yj with out using a relay and it caused issues. not using a relay caused the engine to run for a few seconds after I shut the key off. after I installed a relay the problem when a way.
How much is that system from vintage air? I have a 03 focus with dual fans, all new parts yet fans do not run on their own but, I drive a 07 Pontiac G5 2.2 vin F & I ha e never seen the fans run on their own so I figured out how to run low speed but, I need the fan to operate properly & at a temp lower then 223° low speed, & 230° HI-SPEED..MY CAR CYCKES BETWEEN 178-192 NORMALLY EXCEPT WHEN driving up a continuous hill/ sitting, idling. I turn on low speed at 190-ish but, I cannot control hi-speed yet. Any help is greatly appreciated!!!
what if you istall a temp switch on the ac condenser so the fans turn on when the condenser gets hot and at highway speeds the condenser will stay cool keeping the fans off
Hmmm. DIN 72552 says terminal 86 is relay coil positive and terminal 85 is relay coil negative. Normally it might not matter, but if there is a diode in parallel with the coil it would matter. Are you using another standard? SAE, ISO, ???
I am so confused with pin 85 and 86. Why are some vehicles earthed to 85 and others are earthed to 86. Its understandable if your just hooking up your own relay but if your temporarily tapping into the earth pin whichever it is, you'd want to make sure you're not earthing out the switched power one.
Thank you for checking out our video! We would have to find out how you have the fan wired. That will help us determine what is going on. Depending on the temperature switch you are using, there are many factors that can cause erratic behavior in fan operation. The reading on a gauge may not always match the timing of the fan switch operation due to location in the engine. Please call us so we can help you get it figured out 800-482-9473 and press option 4 for Technical Support. Thank you.
I want my fan to come on as soon as my motor is running in warm weather,is there a reason i couldn't use the exact system shown here with the exception of running my ground direct to battery ? If not how can i wire the cooling fan in a 1995 mustang v6 to come on & stay on the entire time the motor is running ? An inline switch is no good seeing as im doing this for a disabled woman wholl forget to turn the switch off & kill the battery leaving her stranded.
My new 57 Chevy American Autowire kit provides constant power to the relay coil so even when the motor is turned off, if the water temp is above the sensor set point, the fan continues to run. How would you wire the relay coil to only have 12Volt power when the ignition is "on"??
.....???? WHY DO YOU WANT TO CHANGE THE WAY IT COOLS , THAT IS THE WAY IT SHOULD BE SO THAT YOU DONT HAVE EXTREMELY HIGH TEMPERATURES JUST COMPLETELY STUCK IN THE SYSTEM THAT WILL MAKE EVERYTHING BREAK DOWN FASTER.....THE QUICKEST COOL DOWN IS THE WAY TO GO
@@seanglenn1901 Your mis-understanding what I'm looking for. I'm not trying to change how it cools. First of all, I figured why it was running when I turned the key off. The "original" ignition switch simply had "off", "on", and "Start". The new switch that came with the new wiring harness, has one additional position to the left of "off". You would consider that position "Accessory". When I was turning off the ignition, I was going all the way to "Accessory". That was sending power to the fan relay so if the temperature of the coolant was still above the sender set point, it would continue to run the fan even though the motor was no longer running. I have no intention to change the "on-off" set points of the sender.
Using relays to switch a DC fan motor is a real bad idea. It can blast the relay contacts leaving the fan at full RPM dead. Starting DC fan motors draws high amount of DC current that can short out the diodes in your alternator. Get a good solid state controller with SOFT START. See more at www.autocoolguy.com
Have 86 square body doing ls swap with dual electric fans do I need a third relay from trinary switch to kick a fan on and do you sell a dual fan relay kit
Anyone familiar with electric fan circuit breakers? My universal fan kit works up until a certain ambient air temp. After 90 degrees it wont work. I have it in the coolest part of the engine bay, which isn't very hot, and yet hot days will cause it not to turn on. I Live in a costal town and it is pretty reliable-get inland in the summer and I am toast! Any ideas?
When the coil shows a freewheeling diode accross its terminals, I've always seen that the cathode is connected to terminal 86, should not be better to favor the connection of power to terminal 86 and ground to terminal 85 even if diode is not present. Of course the diagram on the relay case dictates the rules!
hello my name is Rob I have problem with 600 Honda Silver wing every time I start the bike the fan keeps running never stops and some fuse get burn what I should do please let me know thank you very much
hello my ac fan relay stops working. after on ac some time fan and compressor working fine. after 10 min only compressor working . fan not working. how to fix it
Hello sir I checked cooling fan resistor and find out that the voltage coming to resistor unstable the voltage up to 13.2 v and suddenly drop to 1.4 v .The fan can,t work in this voltage and when I tuned on , Air conditioner the dashboard light shows antifreeze is low .My car mercedes w202 c200 1999 year .What does it mean ?
Hi my name is christopher, and i have a problem with my 2016 Mazda bt 50 space cab 4x4 manual, and my wiper just stop working, if anyone out there can helps me to fix it please email me thanks.
Relays are a piss poor method to switch fans on and off. The contacts WILL be obliterated over time and miles. Starting current in DC fan motors WILL cause huge current spikes on those relays. It can also blow the diodes in your alternator. Get smart and go with solid state pulse width modulated fan controllers with SOFT START and drive worry free. See www.autocoolguy.com controllers start at 55 amps up to 200 DC amps.
THE FAN WOULD BEGIN TO COME ON, AND THEN THE RELAY WOULD "CLICK", AND THE FAN WOULD STOP... I BOUGHT A NEW RELAY FROM THE PARTS STORE, WHICH DID GET THE FAN TO RUN, BUT, IT WOULDN'T KEEP RUNNING... IT WOULD START, AND STOP CONTINUOUSLY, ALLOWING THE TEMP TO REACH 230 DEGREES... AT THAT POINT, I JUST BYPASSED THE RELAY, SO THAT THE FAN COMES ON WHEN I TURN THE CAR ON... I WOULD REALLY PREFER TO HAVE IT OPERATE OFF THE RELAY, LIKE IT'S INTENDED TO DO... ANY SUGGESTIONS WOULD BE APPRECIATED...
Using relays to switch DC fan motors from a dead stop IS NOT a good idea. First, the contacts will burn, go open or weld shorted. The high peak current can blow the diodes in your alternator. Then the fan at high RPM will driver you nuts and your fuse holders will melt down. Better go with Pulse Width Modulation with the Auto Cool Guy aka www.autocoogguy.com
![How To Test and Diagnose Relays and Wiring [4 & 5 Pin]](http://i.ytimg.com/vi/S-DwV0HLsE4/mqdefault.jpg)
![How To Test and Diagnose Relays and Wiring [4 & 5 Pin]](/img/tr.png)
The reason why I ordering electric parts for my project is this perfect show how it works and how it’s to do from your side. Thanks
This is exactly the video that I needed! I had a bad relay, replaced it, and now my fan works! 1960 Thunderbird with an electric fan in addition to the stock fan.
This is the most useful video showing me all the details related to auxiliary fans, wiring kit, and the most useful part "relay"
Thank you so much for this video.
Great video! Now I not only understand how a relay works, I am also confident I can install this myself :)
Great video. I’ve been hooking up relays for years not understanding why i was or how they worked.
Best video on how to do a cooling fan relay for me !! 👍💯
Excellent explanation , Need to control Fan on my Car, temp. here in Mozambique soar to +35-38 deg C, Cannot wait for the fan to kick-in.... Thank You very much !!!
The important thing about using a relay is to use a relay? Glad that was clarified thanks.
See!!?? Now these are videos worth watching
Okay Thanks so Much!
So which prong on a relay would be for which component of the curcuit? I want to wire a thermal switch(activates at 40°C) to my intercooler and a manual switch in the cockpit. Also since im using switches do i need to use ny ignition source for 12V or can i run straight to my battery since the relay is relying on the two switches that would be "Control the ground" right?
This video explains it all better than the other one hundred that I have come across (7yrs looking) but i really need these answers so that it can finally make complete sense of what I need to do. Also you displayed a 4 prong and a 5 prong, which one would benifit me the most. I also believe there are at least two differnet configurations of 5 prong relays (center prong being 86a or 86b etc.)
Awesome explanation! Thank you.
A lot of great information.
But how would I wire a push through radiator temperature probe?
Is it one wire lead to 85
And one to ground?
OR
One lead to 85 terminal
One lead to and ignition source?
Thanks for your help!
Good job ! I was trying to explaine to my brother about the relay function and I did'nt sound to convincing . you made it sound more convincing and easy to understand . Now if I could just get my headlight's to work ???
THANKS FOR RESPONDING... A FRIEND OF MINE WENT THROUGH AND DETERMINED THAT THE CIRCUIT BREAKER, THAT CAME WITH THE THERMOSTAT WIRING KIT, WAS THE PROBLEM... HE REPLACED IT WITH AN INLINE FUSE... PROBLEM SOLVED...
I like that the fan is automatic, but just putting a switch in isn't dangerous unless you don't use the proper gauge of wire... turning the switch off means the circuit is open and no voltage gets anywhere if the wind spins the fan a bit. I do like how you explain everything. I always thought of relays as a weight saver when it comes to wire cause it just relays the signal to a heavier wire, but obviously it's more complicated than that if they do other things, like wiper relays and fan relays.
I would like to see how you wire an aux fan to turn on when a/c turns on from a/c clutch wire
thanks for this tips really useful and clear explaination
This helped a lot, thank you
What are the part numbers for those control relays? I need the standard 35 or 40 Amp relay. I see they are made from Zettler.
Thanks man,so this switch can cut the power from the AC system and simultaneously connects the cooling fan ground wire to turn it on .?
I am using the AAW Camaro kit for the 69 camaro. Is the orange wire to the fan intended to be the ground switch for the fan to signal it to turn on? Its unclear what the function of this wire is. I have the Dakota digital dash too.
In the video you say that terminal 85 should be connected to power and terminal 86 to ground. When the coil shows a freewheeling diode across
Juan Abreu
The diode across the relay coil is to block any back pulse created when the relay turns off to prevent damage to a transistor switch if used its not a "freewheeling" diode.
“The important thing in hooking up a relay kit is to use a.. relay!” LOL The important thing in drinking water is to drink.. water? Mind blown!
Thank you for this video. But what if the relay has a malfunction? Then the override switch wont complete the circuit. So it has to be either the hot or the cold direct wire that supply the fan to be connected to the override switch.
great job! only question i have is? shouldnt you have a second "free wheeling" diode right close to the fan motor?
wouldnt there be voltage feedback with on the freeway??. without one?
larry
Hi. Great video.
Can i install an electric fan using the temp sensor on the engine. Or do i have to install a separate sensor switch. The temp sensor has 2wires. I want to retrofit to electric fan
Thank you 🙏 for your help !!
I did a fan on my jeep yj with out using a relay and it caused issues. not using a relay caused the engine to run for a few seconds after I shut the key off. after I installed a relay the problem when a way.
I'm having the exact same issue and I think it's because my fan has no relay.
@@scanner2350 You need a relay!
Using a Higher amperage relay is the harness different than a normal relay harness? Since the terminals are so much larger?
How much is that system from vintage air? I have a 03 focus with dual fans, all new parts yet fans do not run on their own but, I drive a 07 Pontiac G5 2.2 vin F & I ha e never seen the fans run on their own so I figured out how to run low speed but, I need the fan to operate properly & at a temp lower then 223° low speed, & 230° HI-SPEED..MY CAR CYCKES BETWEEN 178-192 NORMALLY EXCEPT WHEN driving up a continuous hill/ sitting, idling. I turn on low speed at 190-ish but, I cannot control hi-speed yet. Any help is greatly appreciated!!!
what if you istall a temp switch on the ac condenser so the fans turn on when the condenser gets hot and at highway speeds the condenser will stay cool keeping the fans off
Hmmm. DIN 72552 says terminal 86 is relay coil positive and terminal 85 is relay coil negative. Normally it might not matter, but if there is a diode in parallel with the coil it would matter. Are you using another standard? SAE, ISO, ???
I am so confused with pin 85 and 86. Why are some vehicles earthed to 85 and others are earthed to 86. Its understandable if your just hooking up your own relay but if your temporarily tapping into the earth pin whichever it is, you'd want to make sure you're not earthing out the switched power one.
Thank you
Where do u plug in the relay or do you use an existing one??
Thank you for checking out our video! We would have to find out how you have the fan wired. That will help us determine what is going on. Depending on the temperature switch you are using, there are many factors that can cause erratic behavior in fan operation. The reading on a gauge may not always match the timing of the fan switch operation due to location in the engine. Please call us so we can help you get it figured out 800-482-9473 and press option 4 for Technical Support. Thank you.
I want my fan to come on as soon as my motor is running in warm weather,is there a reason i couldn't use the exact system shown here with the exception of running my ground direct to battery ? If not how can i wire the cooling fan in a 1995 mustang v6 to come on & stay on the entire time the motor is running ? An inline switch is no good seeing as im doing this for a disabled woman wholl forget to turn the switch off & kill the battery leaving her stranded.
hi, i have 3 pin sensor how to know which pin is the ground? and where goes 3rd pin connection? thank you
My new 57 Chevy American Autowire kit provides constant power to the relay coil so even when the motor is turned off, if the water temp is above the sensor set point, the fan continues to run. How would you wire the relay coil to only have 12Volt power when the ignition is "on"??
.....???? WHY DO YOU WANT TO CHANGE THE WAY IT COOLS , THAT IS THE WAY IT SHOULD BE SO THAT YOU DONT HAVE EXTREMELY HIGH TEMPERATURES JUST COMPLETELY STUCK IN THE SYSTEM THAT WILL MAKE EVERYTHING BREAK DOWN FASTER.....THE QUICKEST COOL DOWN IS THE WAY TO GO
@@seanglenn1901
Your mis-understanding what I'm looking for. I'm not trying to change how it cools. First of all, I figured why it was running when I turned the key off. The "original" ignition switch simply had "off", "on", and "Start". The new switch that came with the new wiring harness, has one additional position to the left of "off". You would consider that position "Accessory". When I was turning off the ignition, I was going all the way to "Accessory". That was sending power to the fan relay so if the temperature of the coolant was still above the sender set point, it would continue to run the fan even though the motor was no longer running.
I have no intention to change the "on-off" set points of the sender.
Using relays to switch a DC fan motor is a real bad idea. It can blast the relay contacts leaving the fan at full RPM dead. Starting DC fan motors draws high amount of DC current that can short out the diodes in your alternator. Get a good solid state controller with SOFT START. See more at www.autocoolguy.com
what happens if a relay is wired 30 out 87 in im burning up relays can this be my problem fan motor is new
Amazing i like it
Nice intro music!
Have 86 square body doing ls swap with dual electric fans do I need a third relay from trinary switch to kick a fan on and do you sell a dual fan relay kit
Thanks for watching planning the work"❤❤❤
Anyone familiar with electric fan circuit breakers? My universal fan kit works up until a certain ambient air temp. After 90 degrees it wont work. I have it in the coolest part of the engine bay, which isn't very hot, and yet hot days will cause it not to turn on. I Live in a costal town and it is pretty reliable-get inland in the summer and I am toast! Any ideas?
wouldn't be better to have the fan switch in the radiator?
what do you connect the ground wire from the fan to?
Any decent earth point.
my cooling fan will not shut off on my 1995 Ford Taraus 3.8 with AC. Help ASAP
When the coil shows a freewheeling diode accross its terminals, I've always seen that the cathode is connected to terminal 86, should not be better to favor the connection of power to terminal 86 and ground to terminal 85 even if diode is not present. Of course the diagram on the relay case dictates the rules!
Juan Abreu
Where does the trinary switch go
hello my name is Rob I have problem with 600 Honda Silver wing every time I start the bike the fan keeps running never stops and some fuse get burn what I should do please let me know thank you very much
rabah otsmane the fan relay is stuck on.
hello my ac fan relay stops working. after on ac some time fan and compressor working fine. after 10 min only compressor working . fan not working. how to fix it
Got a p0480 code on my 2006 dodge magnum 3.5 how do I fix this. Anyone
Thank u شكرا
Hello sir I checked cooling fan resistor and find out that the voltage coming to resistor unstable the voltage up to 13.2 v and suddenly drop to 1.4 v .The fan can,t work in this voltage and when I tuned on , Air conditioner the dashboard light shows antifreeze is low .My car mercedes w202 c200 1999 year .What does it mean ?
Voltage regulator is bad, very common problem with those cars.
where this regulator location on w202 ?
How to know if ac switch is good
what about,,,Flex-a-lite Electric Fan Controller
Thanks
Hi my name is christopher, and i have a problem with my 2016 Mazda bt 50 space cab 4x4 manual, and my wiper just stop working, if anyone out there can helps me to fix it please email me thanks.
its the control arm, either buy a new one or sometimes the connector can be loose, just tighten it.
Relays are a piss poor method to switch fans on and off. The contacts WILL be obliterated over time and miles. Starting current in DC fan motors WILL cause huge current spikes on those relays. It can also blow the diodes in your alternator. Get smart and go with solid state pulse width modulated fan controllers with SOFT START and drive worry free. See www.autocoolguy.com controllers start at 55 amps up to 200 DC amps.
THE FAN WOULD BEGIN TO COME ON, AND THEN THE RELAY WOULD "CLICK", AND THE FAN WOULD STOP... I BOUGHT A NEW RELAY FROM THE PARTS STORE, WHICH DID GET THE FAN TO RUN, BUT, IT WOULDN'T KEEP RUNNING... IT WOULD START, AND STOP CONTINUOUSLY, ALLOWING THE TEMP TO REACH 230 DEGREES... AT THAT POINT, I JUST BYPASSED THE RELAY, SO THAT THE FAN COMES ON WHEN I TURN THE CAR ON... I WOULD REALLY PREFER TO HAVE IT OPERATE OFF THE RELAY, LIKE IT'S INTENDED TO DO... ANY SUGGESTIONS WOULD BE APPRECIATED...
ty
RELAYS TURN INTO TRASH FROM HIGH STARTING CURRENT OF DC FAN MOTORS!
Using relays to start a DC fan motor is NUTS! They will burn out and fail over time. Call The Auto Cool Guy for Sold State PWM Controllers.
This will fail in shorten time than relay its not reliable (that controler) or module
Using relays to switch DC fan motors from a dead stop IS NOT a good idea. First, the contacts will burn, go open or weld shorted. The high peak current can blow the diodes in your alternator. Then the fan at high RPM will driver you nuts and your fuse holders will melt down. Better go with Pulse Width Modulation with the Auto Cool Guy aka www.autocoogguy.com