In this video I show how my evaporator switch failed in the closed position. This caused my AC to freeze all of the time. It also caused drivability problems. Hope it helps
Thank you, I have complained constantly to Chevy about my 2019 Trax ac freezing up and they keep telling me refrigerant is correct level, and they can’t fix what they can’t duplicate. It has gotten to the point of freezing up sooner as time goes by. I will check switch
With a vehicle that new you would not have a low pressure switch controlling the cycling of the compressor. On your vehicle you have an expansion valve on the firewall that meters refrigerant. That could be the issue. When was the last time your cabin air filter was changed? If it is stopped up that will cause low air flow problems and could cause evaporator freezing. Lastly your Trax should have a temperature sensor somewhere close by the evaporator inside of the vehicle. That sensor reads the temperature of the evaporator and is what tells the computer to cycle the compressor on and off. These do go bad but you can't tell without a scan tool to tell you what the sensor is reading.
@@Bbernhardsr We change the cabin filter regularly, living here in Florida...LOL. I appreciate the help, I think Chevrolet is trying to dodge repairing this until the warranty is out. Appreciate the direction on what to look at. Going to have a conversation with the service manager at Chevy.
Hey man awesme video! I have a 2006 ford econoline. My ac lines are always frozen everytime i drive without my ac switch even being turned on. Do you think my switch failed on all the time??
If your ac lines are frozen and you don't have it turned on then you have a problem you should fix. I would start by simply unplugging the compressor and see if the clutch is still engaged after that.
Any low side pressure below 22 psi will close the cycling switch causing the compressor to turn off. If you are having gauge readings of 15 psi and the compressor is still on then you definitely have a bad low side cycling switch.
I have same issue on my semi truck. No one could fix years and years. Evaporator freezes and blocking airflow. I have to turn off A/C for a while to melt ice down then turn on until freezes again.
@@Bbernhardsr No it’s old truck 2012 million miles. But I’ll let my mechanic to check that switcher. Evaporator was replaced, temperature sensor replaced, fan replaced 3 times, while l found why doesn’t blowing cold air because ice on evaporator blocking the air flow. And hope that is the problem because that issue took very long time.
@@shafrana2You say it has a temperature sensor so I am assuming the compressor is cycled by the ecm and not cycled by a switch like my 98 chevy. I am curious now to know if your compressor is switched by a low side switch.
No. The switch is just a switch. The short has to be somewhere else. Maybe the windings in the ac clutch are shorting. One for sure way to tell is just jump the two wires together and see if you still have the issue. That will take the switch out of the equation all together.
Question. My 2010 Dodge Ram QC seems to be freezing. Fan blows cold air, but after awhile, the “wind speed” out of the vents decreases but is still cold. I run off my ac, fan still blowing, after about 5 minutes, the air speed increase to full and I tune the ac on and all is well for about 15 minutes. It’s a cycle I have to do. I just watch this video and is the evaporator switch the problem.
@@AlfalfaInc if I am right newer vehicles rely on a temperature sensor that is actually inside of the evaporator housing to do what the switch on my accumulator does. It reads the evap temperature and once it gets to about 26°F it will let the ECM know it is time to cycle off the compressor. If airflow is good, you know for a fact that your freon charge is correct, and you know that your metering device (orifice tube or txv) is flowing correctly, then you would need a scan tool to see if the sensor is reading the correct data.
@@Bbernhardsr I think it's the low pressure regulator that connects to the evaporator. It's not closing so the compressor is constantly running and freezing up and freezing up the line connecting to the evaporator.
Yes it is different but the same. This is a mechanical on and off switch depending on low side pressure. The actual current for the ac clutch travels through this switch. An evaporator sensor reads the temp of the evaporator and then tells the computer to activate or deactivate the relay for the compressor clutch. In the end they both perform the same kind of function just in different ways.
@@Bbernhardsr hmmm okay. I have a 2012 ford fusion acting the same way and I know we have a EVAP sensor located in the dash. Had it recharged with the proper amount but didn't remedy the issue, coil still froze up. Didn't know if vehicles had both sensor and switch or just one or the other.
@@beammeupscottsp7952 newer vehicles have only the sensor. I know a lot of those fords have the sensor in a really ridiculous place and literally the entire dash has to be removed in order to change it. Yes if that sensor is bad it can cause the same problem with freezing up. A good scan tool would be able to see the evap temp pid.
@@Bbernhardsr I've seen vids on ford fusions to replace the sensor w/o removing the dash though, might give it a try on my own if the mechanic diagnoses it as a faulty sensor.
That is not the evaporator switch. that is a pressure switch that cuts your compressor off, if you don't have enough freon. The evaporator switch is inside the evaporator case in the dash, also called the thermostat switch, which measures the evaporator temperature and cycles the compressor accordingly. Labor calls for removing dash to replace evap switch.
I explained in detail how the switch functions. Yes if I loose freon and the pressure goes below 26psi it will permanently turn off the compressor until the charge is brought back up. In these older vehicles this switch is the compressor cycling switch. In newer vehicles it is replaced by an evaporator temperature sensor and then the ecu cycles the compressor and then the switch just becomes a low pressure cutout switch.
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Buddy you did an excellent job of explaining how the system works, it couldn’t be explained any better! Good Job!
Thanks I appreciate it!
I just replaced the cabin filter in my Mazda 3 2007 and now, no more frozen lines. Thank you!
very informative video! Great job!!
Thank you so much for this very informative video. I'ma now take a look into this possibility in my ac issues
Nice informative video.
Hvac system, cool, you know your stuff well.
Thank you, I have complained constantly to Chevy about my 2019 Trax ac freezing up and they keep telling me refrigerant is correct level, and they can’t fix what they can’t duplicate. It has gotten to the point of freezing up sooner as time goes by. I will check switch
With a vehicle that new you would not have a low pressure switch controlling the cycling of the compressor. On your vehicle you have an expansion valve on the firewall that meters refrigerant. That could be the issue.
When was the last time your cabin air filter was changed? If it is stopped up that will cause low air flow problems and could cause evaporator freezing.
Lastly your Trax should have a temperature sensor somewhere close by the evaporator inside of the vehicle. That sensor reads the temperature of the evaporator and is what tells the computer to cycle the compressor on and off. These do go bad but you can't tell without a scan tool to tell you what the sensor is reading.
@@Bbernhardsr We change the cabin filter regularly, living here in Florida...LOL. I appreciate the help, I think Chevrolet is trying to dodge repairing this until the warranty is out. Appreciate the direction on what to look at. Going to have a conversation with the service manager at Chevy.
@@dburto13hey! Any updates from Chevy on what the issue was? Thanks!
@@remstud1 No, but I think it’s like the author said, the txv, which is not an easy fix on the 2019, at least not for me anymore 😂👍👊
Good
Hey man awesme video! I have a 2006 ford econoline. My ac lines are always frozen everytime i drive without my ac switch even being turned on. Do you think my switch failed on all the time??
If your ac lines are frozen and you don't have it turned on then you have a problem you should fix. I would start by simply unplugging the compressor and see if the clutch is still engaged after that.
Good video
Thanks
How do you know without a scan tool if evaporator switch or just a bad accumulator ?
I have a scan tool. Accumulators don't really go bad that I am aware of.
What does this look like on the gauges? 15 low, 200 high?
Any low side pressure below 22 psi will close the cycling switch causing the compressor to turn off. If you are having gauge readings of 15 psi and the compressor is still on then you definitely have a bad low side cycling switch.
I have same issue on my semi truck. No one could fix years and years. Evaporator freezes and blocking airflow. I have to turn off A/C for a while to melt ice down then turn on until freezes again.
Is it a newer model? Maybe it has an issue similar to this?
@@Bbernhardsr No it’s old truck 2012 million miles. But I’ll let my mechanic to check that switcher. Evaporator was replaced, temperature sensor replaced, fan replaced 3 times, while l found why doesn’t blowing cold air because ice on evaporator blocking the air flow. And hope that is the problem because that issue took very long time.
@@shafrana2You say it has a temperature sensor so I am assuming the compressor is cycled by the ecm and not cycled by a switch like my 98 chevy. I am curious now to know if your compressor is switched by a low side switch.
@@Bbernhardsr I’ll let you know for sure for the result when they replace that switch. Which never been replaced
Can this evaporator switch overload and blow the AC fuse?
No. The switch is just a switch. The short has to be somewhere else. Maybe the windings in the ac clutch are shorting. One for sure way to tell is just jump the two wires together and see if you still have the issue. That will take the switch out of the equation all together.
Question. My 2010 Dodge Ram QC seems to be freezing. Fan blows cold air, but after awhile, the “wind speed” out of the vents decreases but is still cold. I run off my ac, fan still blowing, after about 5 minutes, the air speed increase to full and I tune the ac on and all is well for about 15 minutes. It’s a cycle I have to do. I just watch this video and is the evaporator switch the problem.
When was the last time you changed your cabin filter?
Same thing is happening to my 14 Subaru wrx. Fairly new cabin air filter too
@@AlfalfaInc if I am right newer vehicles rely on a temperature sensor that is actually inside of the evaporator housing to do what the switch on my accumulator does. It reads the evap temperature and once it gets to about 26°F it will let the ECM know it is time to cycle off the compressor. If airflow is good, you know for a fact that your freon charge is correct, and you know that your metering device (orifice tube or txv) is flowing correctly, then you would need a scan tool to see if the sensor is reading the correct data.
That is exactly the same issue in my Chevy van. I just have to find out what that part which sticks out of the AC compressor is called.
Part that sticks out of the compressor? Does it plug in?
@@Bbernhardsr I think it's the low pressure regulator that connects to the evaporator. It's not closing so the compressor is constantly running and freezing up and freezing up the line connecting to the evaporator.
@@ericshiiba1847 is it mechanical or electrical?
Is this switch different from an EVAP sensor?
Yes it is different but the same. This is a mechanical on and off switch depending on low side pressure. The actual current for the ac clutch travels through this switch.
An evaporator sensor reads the temp of the evaporator and then tells the computer to activate or deactivate the relay for the compressor clutch.
In the end they both perform the same kind of function just in different ways.
@@Bbernhardsr hmmm okay. I have a 2012 ford fusion acting the same way and I know we have a EVAP sensor located in the dash. Had it recharged with the proper amount but didn't remedy the issue, coil still froze up. Didn't know if vehicles had both sensor and switch or just one or the other.
@@beammeupscottsp7952 newer vehicles have only the sensor. I know a lot of those fords have the sensor in a really ridiculous place and literally the entire dash has to be removed in order to change it. Yes if that sensor is bad it can cause the same problem with freezing up. A good scan tool would be able to see the evap temp pid.
@@Bbernhardsr yup was told the entire dash needed to be pulled just to change the sensor and that also came with a hefty price 😂
@@Bbernhardsr I've seen vids on ford fusions to replace the sensor w/o removing the dash though, might give it a try on my own if the mechanic diagnoses it as a faulty sensor.
That is not the evaporator switch. that is a pressure switch that cuts your compressor off, if you don't have enough freon. The evaporator switch is inside the evaporator case in the dash, also called the thermostat switch, which measures the evaporator temperature and cycles the compressor accordingly. Labor calls for removing dash to replace evap switch.
Sorry but you are mistaken in this case. My truck is a 98. In newer vehicles then you would be correct.
I explained in detail how the switch functions. Yes if I loose freon and the pressure goes below 26psi it will permanently turn off the compressor until the charge is brought back up. In these older vehicles this switch is the compressor cycling switch. In newer vehicles it is replaced by an evaporator temperature sensor and then the ecu cycles the compressor and then the switch just becomes a low pressure cutout switch.