For the tacoma, 3.4L 6-cyl 5VZ-FE engine the jiggle valve is in 6 o-clock position as mentioned in these comments in contrast to this video. Some 4Runner years use this same engine.
Per Toyota_4runner.org :The FSM says the jiggle valve must be pointed downward at the 6 o'clock position. Some people with the Haynes manual for their trucks says it's supposed to be placed at the 12 o'clock position. Some on this forum have recently replaced their thermostats, including myself, and found the jiggle valves in different position. @StreetCreeper found his at the 1-1:30 position. I found mine at the 3 o'clock position. I placed my new one at the 6 o'clock position and nothing changed. My coolant temps were around 190 before and that's where they are now. @DK327 placed his at 12 and found he was running in the 200's for his coolant temp. When he switched it to 6, his coolant temp dropped to the standard 190 range where most of us run at.
Jiggle valve MUST be installed down in the 6 O'Clock position for the 3.4 motor shown here. With the standard 180* T-Stat, it'll run at 187-192 all day. Install it up at 12, add 8-10 degrees. Please correct your video.
The location of this thermostat is something I am not used to. To have the thermostat connected to the Lower Radiator Hose really threw me for a loop. I am used to the thermostat being on the top of the engine and connected to the Upper Radiator Hose. So, thank you very much for sharing this information. My question now is.... which direction does the water flow through this radiator? Does the hot water come into the radiator from the top or from the bottom? I am used to the hot water coming in from the top and cooled water settling at the bottom.
After replacing the radiator and running the engine I could feel that the Upper hose is hotter and the Lower hose is cooler. So hot water still comes in at the top of the radiator even though the thermostat is mounted lower on the engine.
Water flows in the engine from the upper hose, and out of the engine from the lower hose. A good way to check if u have a bad thermostat is to feel the upper hose and lower hose while running your truck, if the upper hose gets hot but the lower does not that means the therm isn’t opening and alllwing coolant out of the engine
Bought a thermostat straight from Toyota and the 4.0 v6 has the jiggle vent on the top. Since the housing and thermostat are sold as one, I imagine it came properly installed.
If it is leaking it probably just needs the rubber gasket replaced. But since you are already in there, with the system drained, spend the extra $12 and replace the thermostat also.
I ended up having to buy a new Water Neck for the thermostat. The original one was corroded at one spot and the corroded hole was so big that the rubber gasket around the thermostat could not seal it off. So the water leaked out. $35 at O'Reilly's Auto Parts. They were able to get it for me in one day.
be thao This is Tacoma 95..what is important, 3.4Liter V6 Engine, model 5VZ-FE . Many reasons to replace Thermostat, here it was slight engine overheating.
My 4Runner is slightly overheating at stops of more than 2 minutes. As soon as I up the rpm it cools down. The fan clutch is fine because the fan told my fingers it was. lol Do you suppose this is the thermostat that is to blame?
I don''t know about all engines with the thermostat lying on its side at the bottom of the engine, but the 3.4 l v-6 doesn't care how the jiggle valve is placed. Some people claim it is to remove trapped air. If so how does air get to the bottom of the radiator? My grandfather worked at Ford for a number years and he told me the hole in the wing of the thermostat was to allow a small amount of coolant through in in the event the thermostat failed closed. I received the same information from a parts rep at NAPA. This makes sense to me as thermostats almost always fail closed and a small amount of coolant would allow a driver to get off the road before a radiator failed. If people want to believe air in the bottom of the radiator can occur that's fine but logic says that can't happen....
@@1420MHZ You are right DK and makes a huge difference. Here's the important note in the Toyota repair manual with engines (5VZ-FE). The thermostat's jiggle valve is ONLY installed in the DOWNWARD position (6 O'Clock) see page # CO-12 in your factory repair manual.
VW put the thermostat housing on the bottom of the there VW rabbit engine, if you didn't let it idle til it opened in cold weather , it would stay closed and overheat
Thanks so much for the video! Great video for us 4runner, people that don't get as much attention as taco's. Do you recommend OEM radiators? amazon has a denso for 100 bucks. thinking of going that route.
I bought a Stant #14078 thermostat (180 degrees) and it doesn't have a jiggler valve. The 14077 (170 degrees) doesn't either. Which brand are you using?
In this video he already had the cooling system completely drained. At the very beginning of the video (in seconds 0-3) you can see that the Upper Radiator Hose has been completely removed. I also think from what he describes and how clean the area is that he (or someone else ) may have replaced the Water Pump recently before filming this.
On 4runners, the jiggle valve on thermostat is actually in 6pm position, not sure about Tacoma's but might be worth a 2nd look.
This is correct. The truck will run 10 degrees cooler if the jiggle valve installed at 6 o clock
For the tacoma, 3.4L 6-cyl 5VZ-FE engine the jiggle valve is in 6 o-clock position as mentioned in these comments in contrast to this video. Some 4Runner years use this same engine.
Per Toyota_4runner.org :The FSM says the jiggle valve must be pointed downward at the 6 o'clock position. Some people with the Haynes manual for their trucks says it's supposed to be placed at the 12 o'clock position. Some on this forum have recently replaced their thermostats, including myself, and found the jiggle valves in different position. @StreetCreeper found his at the 1-1:30 position. I found mine at the 3 o'clock position. I placed my new one at the 6 o'clock position and nothing changed. My coolant temps were around 190 before and that's where they are now. @DK327 placed his at 12 and found he was running in the 200's for his coolant temp. When he switched it to 6, his coolant temp dropped to the standard 190 range where most of us run at.
Haynes and Chilton manuals both recommend the jiggle valve be within 30° of the 12 o'clock position
Doesn't the FSM say to put it at 6 o'clock?
Jiggle valve MUST be installed down in the 6 O'Clock position for the 3.4 motor shown here. With the standard 180* T-Stat, it'll run at 187-192 all day. Install it up at 12, add 8-10 degrees. Please correct your video.
The location of this thermostat is something I am not used to. To have the thermostat connected to the Lower Radiator Hose really threw me for a loop. I am used to the thermostat being on the top of the engine and connected to the Upper Radiator Hose. So, thank you very much for sharing this information.
My question now is.... which direction does the water flow through this radiator? Does the hot water come into the radiator from the top or from the bottom? I am used to the hot water coming in from the top and cooled water settling at the bottom.
After replacing the radiator and running the engine I could feel that the Upper hose is hotter and the Lower hose is cooler. So hot water still comes in at the top of the radiator even though the thermostat is mounted lower on the engine.
Water flows in the engine from the upper hose, and out of the engine from the lower hose. A good way to check if u have a bad thermostat is to feel the upper hose and lower hose while running your truck, if the upper hose gets hot but the lower does not that means the therm isn’t opening and alllwing coolant out of the engine
@@boardpalmtrees1946 thats my issue im going to replace the Tstat put a new radiator in bottom hose stone cold after road test.
Bought a thermostat straight from Toyota and the 4.0 v6 has the jiggle vent on the top. Since the housing and thermostat are sold as one, I imagine it came properly installed.
If it's leaking from the area that house's the thermostat it usually means it's sticking or going bad right?
That's happening to me now
What did it end up being? Water pump?
If it is leaking it probably just needs the rubber gasket replaced. But since you are already in there, with the system drained, spend the extra $12 and replace the thermostat also.
I ended up having to buy a new Water Neck for the thermostat. The original one was corroded at one spot and the corroded hole was so big that the rubber gasket around the thermostat could not seal it off. So the water leaked out. $35 at O'Reilly's Auto Parts. They were able to get it for me in one day.
@@richardmang2558total long shot because this comment was 2 years ago, but I have to do this tomorrow. Any advice?
Nice, a very quick video. Thx
What year is this? And can you tell me what would cause to replace a thermostat?
be thao This is Tacoma 95..what is important, 3.4Liter V6 Engine, model 5VZ-FE . Many reasons to replace Thermostat, here it was slight engine overheating.
My 4Runner is slightly overheating at stops of more than 2 minutes. As soon as I up the rpm it cools down. The fan clutch is fine because the fan told my fingers it was. lol Do you suppose this is the thermostat that is to blame?
Great information 👍 thank you
I don''t know about all engines with the thermostat lying on its side at the bottom of the engine, but the 3.4 l v-6 doesn't care how the jiggle valve is placed. Some people claim it is to remove trapped air. If so how does air get to the bottom of the radiator? My grandfather worked at Ford for a number years and he told me the hole in the wing of the thermostat was to allow a small amount of coolant through in in the event the thermostat failed closed. I received the same information from a parts rep at NAPA. This makes sense to me as thermostats almost always fail closed and a small amount of coolant would allow a driver to get off the road before a radiator failed. If people want to believe air in the bottom of the radiator can occur that's fine but logic says that can't happen....
JIMMY TATE with jiggle valve @12pm my engine temp is 207F with it at 6pm its 190F right where it should be since its a 180F thermostat.
@@1420MHZ You are right DK and makes a huge difference. Here's the important note in the Toyota repair manual with engines (5VZ-FE). The thermostat's jiggle valve is ONLY installed in the DOWNWARD position (6 O'Clock) see page # CO-12 in your factory repair manual.
VW put the thermostat housing on the bottom of the there VW rabbit engine, if you didn't let it idle til it opened in cold weather , it would stay closed and overheat
Toyota manual says jiggle valve on bottom/6 o'clock?
Thanks so much for the video! Great video for us 4runner, people that don't get as much attention as taco's. Do you recommend OEM radiators? amazon has a denso for 100 bucks. thinking of going that route.
+Bardia Ghajari that should work just fine...
Just be aware that the $100 Denso is made in Taiwan if that is o.k. with you and is not packed real well in the box.
I just bought a generic from Amazon and have had no issues.
I bought a Stant #14078 thermostat (180 degrees) and it doesn't have a jiggler valve. The 14077 (170 degrees) doesn't either. Which brand are you using?
This was from Toyota Dealer
Only buy Toyota brand. $26
Ty
Thanks
I need help, the bottom bolt of the three that hold on the thermostat hose is snapped and I need to figure out how to replace it
Oh man.... I feel sorry for you. How did it go?
@@richardmang2558 had to remove bumper and radiator to get in and I still couldn’t get it out so I just replaced the whole water pump
Where’s the 3rd bolt can only find the top two
Thanks for sharing your video
I have my OBD scanner reading P0031, Fuel sys 1 CL. Does it have to do with replacing the Thermostat?please help
or is it an O2 Sensor that I have to replace?
I cannot help you over internet with that….
its ok, I like your videos.
Good Luck !
ITS OXYGEN SENSOR DUMMY....
Obviously you don't need to drain your radiator or anything else?
In this video he already had the cooling system completely drained. At the very beginning of the video (in seconds 0-3) you can see that the Upper Radiator Hose has been completely removed. I also think from what he describes and how clean the area is that he (or someone else ) may have replaced the Water Pump recently before filming this.
What millimeter socket talk English or don't make the video
"Talk English"?😂 You haven't even mastered your primary language and you're criticizing his secondary language?
Can't understand a damn thing he's saying