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Old 05-05-2006, 12:23 AM   #1
Smiley1
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Default air conditioning not working

I have a 96 SL2 that I bought without AC working. I checked the low side of the ac line with a guage and it showed that it was in proper range. With AC on max, the clutch does not engage. All fuses are good, including the relay. I tested the wire to the clutch and found no current. I jumped the battery to the clutch and it engaged but had an electrical buz to it. Not sure if thats bad or not. I left it running for a while but no cold air.

This was done in mild temps of about 70 degrees. Any ideas? I searched and could not find any solutions.
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Old 05-05-2006, 01:32 AM   #2
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Default Re: air conditioning not working

You per chance try to check pressure on low side with compressor (jumped) on?
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Old 05-05-2006, 08:59 PM   #3
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Default Re: air conditioning not working

Proper range?? What was the pressure?
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Old 05-05-2006, 10:37 PM   #4
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Default Re: air conditioning not working

It was 27 to start and I charged it up to 43 psi with no change.
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Old 05-05-2006, 10:47 PM   #5
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Default Re: air conditioning not working

Those home recharge kits can be deceptive. The static (A/C compressor NOT turning) will always be higher. Once the system engages, the low side pressure will DROP dramtically in all liklihood. I will add that you can only measure the true health of the system with a two gauge set that reads both the high AND low side on the system while it is actually operating. Anything else is a GUESS. Guessing, when it comes to A/C, is generally not a wise idea.
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Old 05-05-2006, 11:39 PM   #6
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Default Re: air conditioning not working

As wolfman said.
When you are dealing with a system that has a total charge of 1.5 pounds it is more than hard to get the correct operating charge in with the DIY kits from parts stores.

I will also add that AC work in the hands of people who don't quite know what they are doing can be DANGEROUS so be careful. R-134 boils in the area of minus 30-40 degrees. It will cause you "burns/frostbite" like you don't want to know.

43 PSI is not a high enough pressure to turn the AC system on. I can't remember the pressure that will kick the system on but it will be in the 60-70 PSI area.
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Old 05-06-2006, 01:30 AM   #7
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Default Re: air conditioning not working

Quote:
Originally Posted by ssicarman
43 PSI is not a high enough pressure to turn the AC system on. I can't remember the pressure that will kick the system on but it will be in the 60-70 PSI area.
Thats all I needed to know. Thanks.
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Old 05-07-2006, 09:23 PM   #8
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Default Re: air conditioning not working

Quote:
Originally Posted by ssicarman
43 PSI is not a high enough pressure to turn the AC system on. I can't remember the pressure that will kick the system on but it will be in the 60-70 PSI area.
whats the ideal pressure range for a 95 SC2? mines reading around 25 psi on my home kit gauge, and the compressor isn't kicking on at all... maybe thats the problem
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Old 05-07-2006, 10:10 PM   #9
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Default Re: air conditioning not working

With the AC system properly charged and the system running normally the compressor will kick out before 25 PSI.

Below are readings from the service manual of the system for "normal" values. This is what you should have under most conditions.

System Condition Charts - Definition and Usage Degrees*
Suction*
Discharge*
Outlet*

21C (70F)
180-206 kPa (26-30 psi)
793-1172 kPa (115-170 psi)
5-9C (40-48F)

27C (80F)
166-206 kPa (24-30 psi)
1241-1482 kPa (180-215 psi)
6-10C (42-49F)

33C (90F)
152-179 kPa (22-26 psi)
1551-1861 kPa (225-270 psi)
6-10C (43-50F)

38C (100F)
159-186 kPa (23-27 psi)
1896-2206 kPa (275-320 psi)
10-13C (50-56F)
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Old 05-08-2006, 11:14 AM   #10
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Default Re: air conditioning not working

NOTE: Ssicarman's numbers indicate pressures on the low and high sides with the system OPERATING. Also note the CRITICAL ambiant air temperatures and how they effect the readings.
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Old 06-11-2006, 05:57 PM   #11
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Default Re: air conditioning not working

I want to say that I have fixed my AC problem. I had a leaky stem valve. I replaced it and got one of those high and low side guages with some freon. With the system reading zero, it took 2 and into the 3rd can before I got it where it needed to be. Very cold AC now.

I found that changing engine speeds allowed me to drain the cans better. Hope this helps some folks out there. And thanks to all the replied. Now we will see if the system stays charged....
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