Question about 1997 Cadillac DeVille

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Ac compressor off due to low on r134a but wont take charge, do ihave to reset the compressor or what, how do i turn it on so it will take charge?

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  • holmes5151 Apr 20, 2009

    thanks cheif

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Try this first! I had the same problem The system would not take the charge I was there for 2 freaking hours in 100 degree weather in Texas trying to recharge finally I figured out that in order for the A/C to recharge I had to first disconnect the battery so the computer would reset itself for at least 1 min. I then reconnected the battery turned the car back on put the A/C on high hooked the freon can back up and viola the A/C took the recharge immediately.

Jerry

Posted on Apr 23, 2009

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There could be several reasons for this to occure, first often times when the system doesn't turn on is because it could be over charged. also there could be a dryer that is clogged or the expansion valve is not functioning.then you have the electrical side of the problem if the a/c clutch doesn't engage it could be that there is no power going to that circuit. there is also the hi/lo pressure switch that regulates the system as well. then you could also have a clogged condensor. I would first start by checking the fuse and the relay for the a/c clutch. then if that ius in order connect a vaccum pum,p to the system and bring it down to a negative 29 psi. after about 30 minutes shut the valves on the gauges and see if there is a loss of vacumm if there is you have a leak and that will exp[lain the clutch not engaging. next if your maintaining a vaccum continue to vaccum the system for several hours to make sure that the system is free of moisture. moisture is the number one reason for clogged system because it attacks the dryer granules.once that is done recharge the system to specifications. then run the system. the low pressure side shoulkd be between 35-50 psi and the high side 150 - 180 psi i also recommend if you follow all the steps pryer to recharging replace the dryer that is always a safe bet. if you still continue to have a problem my bet would be that your expansion valve needs replacing because it is not opening to allow the refrigerant to flow through the system

Posted on Apr 20, 2009

  • Ronald Mueller
    Ronald Mueller Apr 20, 2009

    if you could rate the solution it would be greatly appreciated thank you. Ron M

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