russian rocket Posted June 2, 2011 Report Share Posted June 2, 2011 hey guys im having issues with my ac in my 02 audi s4 it was working fine and all of a sudden stopped blowing cold air. my dash is reading the correct temp and my compressor kicks on but does not cycle. i took it to a shop and they said my low side was reading high and my high side was reading low. i tried adding refrigerant but it wouldnt take any. any idea what it could be? all fuses are good no leaks econ mode is off compressor does kick on the shop thinks its electrical related any help is greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Patterson Posted June 3, 2011 Report Share Posted June 3, 2011 My leaning would be towards one of the pressure switches. Does the blower motor come on? Quote Link to comment Share on other sites More sharing options...
russian rocket Posted June 3, 2011 Author Report Share Posted June 3, 2011 My leaning would be towards one of the pressure switches. Does the blower motor come on? yep blower motor blows strong and the condenser fans kick on. i would think if it was one of the pressure switches wouldnt the compressor not kick on? Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted June 3, 2011 Report Share Posted June 3, 2011 My first step would be to have the system evacuated and recharged. Does the clutch engage? Quote Link to comment Share on other sites More sharing options...
russian rocket Posted June 3, 2011 Author Report Share Posted June 3, 2011 My first step would be to have the system evacuated and recharged. Does the clutch engage? yep the clutch engages. so do you think the refrigerant is bad or that something got clogged up? because it was working just fine and then just stopped instantly, no gradual change, just went from cold to warm. Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted June 3, 2011 Report Share Posted June 3, 2011 yep the clutch engages. so do you think the refrigerant is bad or that something got clogged up? because it was working just fine and then just stopped instantly, no gradual change, just went from cold to warm. The high side is throwing me for a bit of a loop. My thoughts are either A) There is a bad valve in the compressor or B) There may be a lot of moisture in the system. Quote Link to comment Share on other sites More sharing options...
craig71188 Posted June 3, 2011 Report Share Posted June 3, 2011 hey guys im having issues with my ac in my 02 audi s4 it was working fine and all of a sudden stopped blowing cold air. my dash is reading the correct temp and my compressor kicks on but does not cycle. i took it to a shop and they said my low side was reading high and my high side was reading low. i tried adding refrigerant but it wouldnt take any. any idea what it could be? all fuses are good no leaks econ mode is off compressor does kick on the shop thinks its electrical related any help is greatly appreciated. Find a new shop. Compressor is being commanded on by the PCM (clutch is engaging) - usually this means there is sufficient charge in the system and all the sensors are giving a signal within the specs the PCM expects to see. However, low side high/high side low typically is one of two things: 1) Compressor internal issue (not pumping) 2) Expansion device issue (TXV) - this Audi uses an orifice tube so #2 is very unlikely From what you're describing - the compressor is not pumping (hence no low side low pressure and no high side high pressure) - or, it is pumping, but there is no restriction (the expansion device) to cause the change in pressure (in this case an orifice tube so not likely the problem). Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted June 3, 2011 Report Share Posted June 3, 2011 Find a new shop. Compressor is being commanded on by the PCM (clutch is engaging) - usually this means there is sufficient charge in the system and all the sensors are giving a signal within the specs the PCM expects to see. However, low side high/high side low typically is one of two things: 1) Compressor internal issue (not pumping) 2) Expansion device issue (TXV) - this Audi uses an orifice tube so #2 is very unlikely From what you're describing - the compressor is not pumping (hence no low side low pressure and no high side high pressure) - or, it is pumping, but there is no restriction (the expansion device) to cause the change in pressure (in this case an orifice tube so not likely the problem). That's my main thought. Internal valve failure = new compressor. Quote Link to comment Share on other sites More sharing options...
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