AC Compressor Clutch Relay
12-21-2010, 05:04 PM
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Well crap no relay. I was really hoping it had a relay, even the napa store said it had a relay from looking what they had documented on their computers. I have my wiring diagram here and have checked both fuses for the AC system, both look good. When I press the switch for the AC in the cab my AC compressor will engage 3 separate times very briefly. Then it the compressor stays shut off completely.
When I jump out the compressor it works like a champ. So I thought it was just the button of the whole electronics panel in the cab. Well I pulled the panel out of my truck and put it in my buddies, and the panel worked just fine. I have also replaced the pressure switch on the compressor and have tested the temp. switch on the coils.
My freon levels are good. When I put a gauge on the system I had 100lbs on each side w/ the compressor off. Can someone help me out w/ this.
When I jump out the compressor it works like a champ. So I thought it was just the button of the whole electronics panel in the cab. Well I pulled the panel out of my truck and put it in my buddies, and the panel worked just fine. I have also replaced the pressure switch on the compressor and have tested the temp. switch on the coils.
My freon levels are good. When I put a gauge on the system I had 100lbs on each side w/ the compressor off. Can someone help me out w/ this.
12-22-2010, 10:08 AM
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Well, most times you are going to have a bad evaporator temp sensor. If you find a scanner that will pull HVAC codes I'm sure you will find a related code stored.
12-22-2010, 07:08 PM
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Yeah I thought it might be the evaporator temp sensor. So I took it out and put it in another pickup of the same model, and their AC system still worked. Wouldn't that be a good way to see if the evap. temp sensor worked?
Where might I find a scanner that can pull HVAC codes? I went to autozone and they tried to pull any codes, but it did not throw any. I think they only scan the motor and drive train sensors. Thanks
Where might I find a scanner that can pull HVAC codes? I went to autozone and they tried to pull any codes, but it did not throw any. I think they only scan the motor and drive train sensors. Thanks
12-23-2010, 10:51 AM
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Yeah I thought it might be the evaporator temp sensor. So I took it out and put it in another pickup of the same model, and their AC system still worked. Wouldn't that be a good way to see if the evap. temp sensor worked?
Where might I find a scanner that can pull HVAC codes? I went to autozone and they tried to pull any codes, but it did not throw any. I think they only scan the motor and drive train sensors. Thanks
Where might I find a scanner that can pull HVAC codes? I went to autozone and they tried to pull any codes, but it did not throw any. I think they only scan the motor and drive train sensors. Thanks
Edit: Are you sure you pulled the right sensor? The one inside the HVAC housing....
12-24-2010, 02:49 PM
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Well not 100%. I pulled a white plastic thing that had wire two wires on the end of it. The plastic was molded like an L. I thought there would just be one sensor in there. If not please let me know and I will look again.
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12-24-2010, 03:44 PM
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Ok I am still not sure if I removed the right thing. I took the glove box off and then pulled the plastic probe thing and stuck it in another pickup. Is there more to the procedure to pull the evap. temp sensor.
12-24-2010, 03:53 PM
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This picture of a mercedes evap. temp sensor is very similar to what the part looked like that I pulled. Let me know if you can if I pulled the right sensor.
http://www.autohausaz.com/search/pro...erm=2108300772
http://www.autohausaz.com/search/pro...erm=2108300772
12-24-2010, 04:02 PM
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Well thanks for the info. Before I go replacing the sensor sense there is so much work to get to the switch, is there a test procedure that I can see if this sensor is in proper working order. Also do you have any idea what I may have pulled out?
12-25-2010, 10:00 PM
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That is fine. It is pretty cold here so the AC is not a big concern at this point, but I would like to get it working before it becomes an issue.
Were you able to look at the link that has a picture of the evap. temp sensor for the mercedes? That looks exactly what I took out behind the glove box. I thought for sure it was the evap. temp sensor.
Were you able to look at the link that has a picture of the evap. temp sensor for the mercedes? That looks exactly what I took out behind the glove box. I thought for sure it was the evap. temp sensor.
12-26-2010, 08:51 AM
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I looked at it. I have not seen one of those before but the latest truck I have had that problem with was an 06. I'll go look at my truck later and take a few pics of what I find.