cd45 Posted August 15, 2006 Share Posted August 15, 2006 OK, I had the A/C upgraded to 134a, and now the compressor does not come on when I push the button on the dash. However, if I hot wire to the battery, it comes on and runs perfectly. If anyone has any ideas, please help. Link to comment Share on other sites More sharing options...
NorthWet Posted August 15, 2006 Share Posted August 15, 2006 Probably the low pressure switch, assuming that the compressor is not even trying to come on (cycling on for a second or more and then shutting off). If this is so, the method you used for charging the system may not have been correct. BTW, it will help to know what vehicle this is on. Link to comment Share on other sites More sharing options...
idosubaru Posted August 15, 2006 Share Posted August 15, 2006 did you get all the R12 out? if the system is under or over charged the compressor won't come on. check your fuses and relays, the fuses to the a/c system are subject to blowing, i'd particularly be sure to look at them since they are so easy to inspect visually. Link to comment Share on other sites More sharing options...
NorthWet Posted August 15, 2006 Share Posted August 15, 2006 GG has good points. ...if the system is under or over charged the compressor won't come on. ... IIRC, overcharged will allow the compressor to come on until the overpressure occurs, and then cut the compressor. Is my memory (and my brain) scrambled-eggs this morning? :-\ Link to comment Share on other sites More sharing options...
daeron Posted August 16, 2006 Share Posted August 16, 2006 i think your right northwet... it runs until it builds up too much pressure, then shuts off.. but at static conditions its not "overpressurized" just overfilled... so it will turn on, for a little bit. Link to comment Share on other sites More sharing options...
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