Question about 1996 Oldsmobile Cutlass Ciera

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A/c wont work, compressor is running, it wont take anymore freon even though it is not enough. the pressure switch on the high has no power at it at all. no fan comes on either. I jumped the relay to get the fan working but still wont cool.I have checked all fuses they are all fine. I need to get it working this is my wifes car and she spends many hours in it a day and we live in florida. thanks

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It is possible to put too much freon in the system and it will do this. you need to drain the system and use a vacuum pump to get the system completely clean. draw a full vacuum on it then charge it with the correct amount of freon according to the labels posted on the vehicle.the pressure switch must be ok or the compressor would not run. the relay may be bad and that may be because the fan has a problem and is burning up the relay. you know these are all guesses because i am not there to see it. i am an ase certified mechanic with a lot of experience on a/c systems. try what i said and please get back to me and i hope we can solve this. good luck

Posted on May 06, 2010

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1 Answer

Is it true if u don't have enough Freon the compressor will not turn


Yes it is true IF your system has a low pressure cutoff switch. Some systems only run a high pressure cutoff switch.
Most newer systems run a high/low pressure switch. When these switches are activated the clutch on the compressor is disengaged.

Jun 05, 2015 | Cars & Trucks

1 Answer

AC not running in my 1998 Jeep Cherokee. Changed AC clutch compressor RELAY, freon level is good, temperature sending unit replaced along with cooling fan! Checked all fuses still good. Can't seem to...


Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.

When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.

The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.

The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.

You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.

Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.

Good luck with this repair and I hope my solution helps you.

Mar 19, 2012 | 1998 Jeep Cherokee

1 Answer

Im told my orphise on my a/c is clogged


if the orifice is clogged the a/c compressor should, with motor running, kick in when you turn on a/c. it will run for 30 to 45 seconds, pulling down engine VERY slightly but noticeable. then the high pressure switch will activate and compressor will stop. if its not completely clogged it will run loger, even a few mins and maybe start to cool a little. when pressure drops enough it will start again and should do same thing over & over. if compressor never starts running it may be a fuse or relay or low on freon. it has a low pressure cutoff also and will not operate under low press, just like high press. cutoff wont let it run with too much. so a cycling compressor that pulls engine down would be proof of clogged orifice

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2 Answers

Ac won't get cold anymore power to compressor but won't click on clutch won't engage possible problems are compressor or evaporator what do you think?


Has the Freon been checked with a gauge to see if there is enough Freon to allow the system to work. Low or no Freon will not allow the compressor to engage. The low pressure switch is most likely activated due to low freon, and will cause this condition.

Aug 19, 2011 | 2001 Jeep Grand Cherokee

1 Answer

Compressor wont run, tried to add freon but the pressure is too high to connect. what could be wrong besides bad compressor


The computer looks at a pressure switch that will close when there is enough pressure to turn the compressor on, that pressure switch could be bad or the relay that the computer uses to turn on the compressor could be bad.

Apr 27, 2010 | 2007 Kia Sorento LX 4x4

1 Answer

A/C 2001 Dodge Dakota compressor wont come on


Check the high side ac clutch cut out switch,witch could be in back of compressor,or in a high side line.By pass the switch to see if the compressor will come on.Also the ac module could be gone out.First check the ac clutch relay,or better yet swap it out with a relay just like it,same number will be on the relay,this will tell you if it is the relay.

Aug 24, 2009 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

My ac wont turn on anymore where is the pressure switch or can it b a fuse


every vehicle develop small leaks over period of time or soon will quit, its common for all vehicle although parts tend to ware and brakes. I would first check the fuses and relays making sure they are good. second check the pressure and the pressure switch. if you systems running low on refrigerant (feon) than you have small leaks or running low. if there not enough pressure in your systems than it wont trigger the switch to run the compressor and that may not cause the AC unit not to run. If your ac just quit running all of sudden, more likely its probably low on freon, than again switch may also be bad. if everything check out as fuses,switch,pressure than next would compressor.the switch will have two wire to it, location can be on the line, on compressor, evaporator and for most of kia on top of the dryer.I would have the systems check for proper pressure before you start replacing different parts. want to save some money, you can get most expensive parts from a junk yard, like compressor, evaporator and motors.

Jul 19, 2009 | 2003 Kia Spectra

3 Answers

A/C Compressor not kicking on


The power to run the compressor clutch coil goes from the battery, to the AC Clutch Relay, somewere in the engine compartment fuse box, then it goes to the positive side of the AC compressor clutch coil; goes thru the coil, activating the compressor, and then goes to complete the circuit through another switch (high pressure protection switch) in the back of the AC compressor and finally reaching negative or Ground.

Disconnect the AC compressor clutch connector and using a 12 V bulb with 2 wires (test lamp) check the following:

1.- connect 1 lamp wire to battery neg; with the other check both pins at connector with the AC in the RUN (AC and ignition switch on ) you should have power in one side.

2.- connect 1 lamp wire to battery positive and with the other check both pins at connector, lamp should light getting the ground from the clutch connector thru the high pressure compressor switch to ground.

On the other side what makes the relay close and let the power flow to the clutch works with the low pressure switch, (if the freon pressure is too low it opens and kills the ground to the relay coil and that kills the compressor), that low pressure switch is in the low pressure side of the freon tubing, the fat pipe that comes from inside the firewall into the accumulator/dryer, a big aluminum cylinder sitting on the right side of the engine compartment in GM cars.

To know if the low press switch is the cause you can unplug it and connect both legs with a paper clip for a minute or two, no more, you don't want to damage the compressor. anyway if jumping the switch makes the compressor come alive and kick in, you either have low freon pressure or a bad switch; it's time for the pressure gauges and check how the compressor is pumping and that is better left to a pro.

By the way you said that your system is a R-12 system, have you considered switching to R-134a the new "ozone friendly" freon? to do that you need to evacuate the system with a recycling machine and pull vacuum in your AC, if it holds the vacuum for a while, then you can be sure that there are not leaks and then dump 1.5 or 2 pound (check the labels in the engine compartment) of R-134a into your system. it will be a good idea to put some fluorescent leak detecting dye in the system to check for leaks, just in case..

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2 Answers

A/C wil not work


if your low on freon the unit will not work.low pressure switch cuts it off. or you have a bad a/c clutch asy.

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2 Answers

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Sounds like you are on the right track. Jump the pressure switch and see if the compressor comes on.

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