Confusing A/C problem
Thread Starter
2020s8
Joined: Sep 2017
Posts: 64
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Confusing A/C problem
We had issues with car overheating and ac not blowing cold air (just sometimes). After many faulty thermostats frkm the dealership, we finally have a functional one installed. The ac however sometimes blows hot and sometimes blows cold air. It seems like an on/off all of a sudden feature. All settings remain the same i terms of temperature etc. It sometimes fixes itself fornmsny days blowing ice air, and sometimes it suddenly returns back to warm air. Dealership recommended replacing the whole compressor and some other smaller psrts around it (2900$). I believe its an electrical problem. I have good knowledge about a lot of things in cars but not the ac systems. Wgat do u guys think is the problem? I thought about relays or sensors maybe
Thread Starter
2020s8
Joined: Sep 2017
Posts: 64
Likes: 13
If the fans were not running properly, wouldn't they cause engine overheating? Temperature wise, the engine is doing fine, at least after changing the thermostat. Sorry I could be wrong, but I'm not being able to relate the AC with the fans.
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Joined: Mar 2017
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From: Denver, CO
Refrigerant could be overcharged, this would cause it to shut down when pressure gets too high and turn back on when it cools down.. Or the pressure switch is faulty.
Was helping my dad with a vehicle that was loosing AC on hot days and long trips.. He bought a can of refrigerant and put it in and it just made it worse to the point you could hear it cycling on/off repeatedly.. Bled out some refrigerant and it started working.
Was helping my dad with a vehicle that was loosing AC on hot days and long trips.. He bought a can of refrigerant and put it in and it just made it worse to the point you could hear it cycling on/off repeatedly.. Bled out some refrigerant and it started working.
Thread Starter
2020s8
Joined: Sep 2017
Posts: 64
Likes: 13
Refrigerant could be overcharged, this would cause it to shut down when pressure gets too high and turn back on when it cools down.. Or the pressure switch is faulty.
Was helping my dad with a vehicle that was loosing AC on hot days and long trips.. He bought a can of refrigerant and put it in and it just made it worse to the point you could hear it cycling on/off repeatedly.. Bled out some refrigerant and it started working.
Was helping my dad with a vehicle that was loosing AC on hot days and long trips.. He bought a can of refrigerant and put it in and it just made it worse to the point you could hear it cycling on/off repeatedly.. Bled out some refrigerant and it started working.
AudiWorld Super User
Joined: Apr 2004
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I'm not saying this IS your problem. Just that it warrants checking. There are LOTS of things that could be causing your intermittent lack of cooling. It likely will require use of refrigeration gauges and scanning with VAG com to figure it out. Ours had a blower motor( for the front AC and heater) fail once and it acted just like the compressor was shutting down. Even the rear air would blow hot. Everything is interrelated. You'll likely need someone well versed in automotive AC and hopefully familiar with VW Audi. Good luck!
Thread Starter
2020s8
Joined: Sep 2017
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Originally Posted by J. It likely will require use of refrigeration gauges and scanning with VAG com to figure it out. [/QUOTE
The problem is that the dealership said it needs a new compressor, and I'm sure they used some scanners, but they also just want to rip people off in Lebanon, so it might not be that big of a problem.
Wow, this is weird... I have to definitely check these too. Shouldn't there be no air coming out of the vents if the blower motor was out?
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Thread Starter
2020s8
Joined: Sep 2017
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Originally Posted by J. It likely will require use of refrigeration gauges and scanning with VAG com to figure it out. [/QUOTE
The problem is that the dealership said it needs a new compressor, and I'm sure they used some scanners, but they also just want to rip people off in Lebanon, so it might not be that big of a problem.
Ours had a blower motor( for the front AC and heater) fail once and it acted just like the compressor was shutting down. Even the rear air would blow hot. Everything is interrelated. [/QUOTE]
Wow, this is weird... I have to definitely check these too. Shouldn't there be no air coming out of the vents if the blower motor was out?
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Thread Starter
2020s8
Joined: Sep 2017
Posts: 64
Likes: 13
[QUOTE=J. It likely will require use of refrigeration gauges and scanning with VAG com to figure it out.
Ours had a blower motor( for the front AC and heater) fail once and it acted just like the compressor was shutting down. Even the rear air would blow hot. Everything is interrelated. [/QUOTE]
The problem is that the dealership said it needs a new compressor, and I'm sure they used some scanners, but they also just want to rip people off in Lebanon, so it might not be that big of a problem.
Wow, this is weird... I have to definitely check these too. Shouldn't there be no air coming out of the vents if the blower motor was out?
Ours had a blower motor( for the front AC and heater) fail once and it acted just like the compressor was shutting down. Even the rear air would blow hot. Everything is interrelated. [/QUOTE]
The problem is that the dealership said it needs a new compressor, and I'm sure they used some scanners, but they also just want to rip people off in Lebanon, so it might not be that big of a problem.
Wow, this is weird... I have to definitely check these too. Shouldn't there be no air coming out of the vents if the blower motor was out?
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