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Compressor acting flaky

dtom4 on Tue May 21, 2013 10:48 PM User is offline

Year: 1993
Make: Saab
Model: 900s
Engine Size: 2.1
Refrigerant Type: Enviro safe
Ambient Temp: 85
Pressure Low: 75
Pressure High: 75
Country of Origin: United States

So I charged the system with enviro safe early last year and system seemed to work fine. Have not driven the car much since and now when I turn on the ac compressor randomly clicks on and off repeatedly and constantly for a split second. It never comes on for more than 2-3 seconds and almost always for a second or less. Took some readings and got 75 psi low and high static. With car running and ac on low side drops as soon as compressor clicks and drops to 35 if compressor stays on for more than a few seconds and high goes to 90. Tried jumping the pressure switch on the dryer but no change in behavior. Not sure where to go from here. Any suggestions would be appreciated.

Dave T.

iceman2555 on Wed May 22, 2013 9:50 AM User is offlineView users profile

Not a fan of your choice of refrigerant...would suggest a total system clean out and a true retro fit with the proper refrigerant.

Static pressures are not an indication of amount of charge. Have not checked a pressure/chart for EnviroSafe, but never the less, the system should be completely charged to the correct amount of refrigerant to perform a valid diagnosis.

Jumping the switch on the drier would not probably have a effect on compressor operation. This would be a normally closed HPCO switch and you do not have a high side pressure problem from your post. It could be the temp sensor located in the evap or a rad fan controller/wiring problem. This could prevent proper compressor operation. Since SAAB utilized several controllers for this system they will all probably need to be checked.

First would be to insure proper recharge....not sure what proper is with EnviroSafe.....back to suggestion #1. But then retro fitting has it's own problem with the correct amount of refrigerant. Once recharged...check the evap temp senor and the rad fan controller. That would be a good place to start or just start with the sensors and go from there. SAAB had a problem with corrosion on this part. Also check the outside temp sensor....this was another known failure problem.

Obtain a service manual for this would be of great benefit for this problem. SAAB AC can be a bit frustrating at times.

Good luck

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Thomas Jefferson

apexair on Mon June 17, 2013 6:56 AM User is offlineView users profile

Vacuum pump is intended for creation of exhaustion in vacuum boaster of brake system of diesel-powered vehicles.
Type of pump is rotor-flaky, single-acting, with the drive from car's motor through cone-belt.
Lubrication system is forced, from the motor's oil system.

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