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.


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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1 Answer

What kind of ac coolant does it have 134a or r 12 and where is the low pressure port for the ac located

Depends on the year. Cars in the early 90's used R12. Anything later uses R134a. The size of the charge ports will define the R134a port. An adapter is needed to fit on the charging hose. R12 requires no such adapter. Ther charging label under the hood will tell you what refrigerant is needed too. Since you failed to give enough information on what make and model car you have, a general answer for the location of the low pressure port will be given. On the compressor, the larger diameter hose connection is the low side. Connect there, or look for the drier/accumulator (Large diameter silver container near the firewall). Connect there. You will need to access the AC information label under the hood to determine how much freon to add to the system.

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You must have a leak, the compressor will not run if the system is low on charge, the charge carries the oil to lube the parts of the system. Also do an electrical jumper of the compressor cycling/pressure sensing switch.

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The r134a pressure may be low in the refrigerant lines causing the compressor to not engage as a safety measure for the compressor.

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1 Answer

Trouble shoot lack of power to AC clutch

Broken wire to it, or upper or lower pressure switch preventing power going to AC Clutch.

Usually, lack of power to it is due to a low refrigerant r134a charge in the system. Add a can or two of refrigerant should rectify this problem, assuming there are no leaks in the a/c hoses or compressor.

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How do you connect a/c charger to make your central air cooler

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1 Answer

My car's ac unit turns off and on so it get's cold and makes a click sound and get's hot. Is that the compressor?

that's the pressure cut off switch or the compressor clutch clicking off due to possibly low refrigerant charge (r134a).

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1 Answer

Ac compressor clutch does not engage

to prevent damage to the air conditioning system there is a "low pressure switch" located on the condenser near the low pressure hose (large one) .. if the refrigerrant (R134A) gets too low then the clutch will be blocked from activating by that switch .. you can have your system tested and recharged or you can do that yourself .. the R134A is available at auto parts stores .. some come with a gague that is required for proper charge .. if you dont already have a gage then yoiu will need that one ... recharge kits often come with instructions .. other less likely but possible problems could be a fuse or bad AC clutch relay. sometimes damaged wiring or bad clutch will be the problem but much more likely just low fluid ..

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2 Answers

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The ac system may need freon added,if the system is low,or out of freon,it will not allow the ac compressor to come on.

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1 Answer

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Try disconnecting the battery for a minute or so and reconnect it. Believe it or not this has worked for me numerous times. If this doesn't work then disconnect the switch on the accumulator. The accumulator is located in the low side (big) hose near the firewall on the passenger side of truck. Using a paperclip jump the two wires (harness side) together with engine running and a/c on. If compressor kicks on when jumped either it's low on freon or the switch is bad. Hope this is helpful.

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1 Answer

2001 Mustang Gt A/C not cooling

You might not have enough R134A in it the system should hold 3 - 5 lbs of pressure if I remeber right. But if the clutch is kicking in then its working but you might not have enough R134A. Buy the kit that has the pressure guage with a trigger on it so you can add what you need. When you fill it turn car on and ac on high then fill it. When ac is off the clutch should spin freely if not then your compressor is junk. As for the slight grinding noise just to make sure with CAR OFF turn the clutch on the compressor and make sure its not rubbing the pulley on the compressor.

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