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up until last night the AC was working fine. This morning I turn on the car and go for a drive and the AC doesn't blow any cold air. It's the same air whether ac is on or off. I checked the low pressure line and the gauge reads red (too high).
I ran the self diagnostic I got the screenshot attached. I'm not sure how to interpret it. I scheduled an appointment to get it checked on Tuesday but I'd like to get it figured out before then.
Help please?
Last edited by xdmds; 05-28-2016 at 06:00 PM.
Reason: additional info
Does it blow hot regardless of set temp? I know there is something within the AC system that gets stuck and cant move over to change temp. I think its called a damper. And when was it last on heat?
EDIT: I did see this before. My dads truck has 2 zone climate. the driver side, when set to cold, would make a noise. Noise would go away when set to hot
Does it blow hot regardless of set temp? I know there is something within the AC system that gets stuck and cant move over to change temp. I think its called a damper. And when was it last on heat?
EDIT: I did see this before. My dads truck has 2 zone climate. the driver side, when set to cold, would make a noise. Noise would go away when set to hot
Yes it blows hot regardless of the set temp. I tried low through 65. The fan adjusts its speed, but its hot air no matter what. The last time the heat was on was probably months ago? Its been in the 80's for a while now
Another thing I noticed while trying to run the self diagnostic was that there is a weird whining noise under the dash when the air turns on. It goes away shortly after I turn the air off.
Does it blow hot air as if the heat is stuck on, or is it just not cooling? The ducts in the dash are going to be quite hot while sitting in the sun, and its going to blow quite hot and then cool off to warm. If the heat is stuck on, it will be hot initially if parked in the sun, cool down a bit if the engine is cold, then warm back up as the engine heats up. You could check if the water valve is working. Ensure the temp is set to LO and go under the hood. Theres two largeish hoses going through the firewall near the passenger side. With the engine running and warm, one should be hot and one should be cool or warmish. If both are hot, your water valve is open for some reason. It's probably broken or stuck and not that hard to replace. If it appears to be working, you can double check by setting the temp to HI and check the hoses again. They both should get hot.
If this all checks out, check the refrigeration system. I would unplug the plug going to the compressor coil and manually apply power to get the clutch to engage. If it fails to pull in, you know thats your issue. If it pulls in and runs perfectly fine, you might have an issue with the charge, electrical, or a connector or contact problem. If it makes bad noises while running, the belt slips, or the engine stalls when it engages, the compressor is done.
It could just be a little low on refrigerant. The dual pressure switch will not allow it to engage if the pressure is too low or high, and the car has no feedback on this.
Thanks for the tip. I tried swapping the ac compressor relay with the radiator fan relay but no difference. The radiator fan still works using the ac compressor relay so I think the relay is fine.
Does it blow hot air as if the heat is stuck on, or is it just not cooling? The ducts in the dash are going to be quite hot while sitting in the sun, and its going to blow quite hot and then cool off to warm. If the heat is stuck on, it will be hot initially if parked in the sun, cool down a bit if the engine is cold, then warm back up as the engine heats up. You could check if the water valve is working. Ensure the temp is set to LO and go under the hood. Theres two largeish hoses going through the firewall near the passenger side. With the engine running and warm, one should be hot and one should be cool or warmish. If both are hot, your water valve is open for some reason. It's probably broken or stuck and not that hard to replace. If it appears to be working, you can double check by setting the temp to HI and check the hoses again. They both should get hot.
If this all checks out, check the refrigeration system. I would unplug the plug going to the compressor coil and manually apply power to get the clutch to engage. If it fails to pull in, you know thats your issue. If it pulls in and runs perfectly fine, you might have an issue with the charge, electrical, or a connector or contact problem. If it makes bad noises while running, the belt slips, or the engine stalls when it engages, the compressor is done.
It could just be a little low on refrigerant. The dual pressure switch will not allow it to engage if the pressure is too low or high, and the car has no feedback on this.
It's just not cooling. I don't hear the clicking from the compressor either.
Thanks guys...
Unfortunately, neither of those relays did anything for me...
The whole story is I put the base flashpro map on the car...was datalogging...turned on ac and bam...ac comes on hot and there was a weird burning smell...
maybe compressor clutch died? coincidence is weird though...it worked fine on the way home...loaded a tune...bam.
05-28-2016, 05:59 PM
