1996 Saturn SL2 No cold air

OAKTREE71

MEMBER
1996 SATURN SL2
250,000 MILES

With the A/C on coldest setting and blower on high the unit blows only hot air. The clutch engages and the LOW pressure is within range but the HIGH pressure is to low to read. All related fuzes are good A/C, ign, HVAC blower door, fan and compressor relays. Can you help please

5 Replies

SATURNTECH9

MECHANIC
30,870 POSTS

What does the low side read with the compressor on and the compressor off?Also what does the high side read with the compressor on and off?

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Monday, June 10th, 2013 AT 12:12 PM

OAKTREE71

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3 POSTS

With the compressor on and off the LOW side reads 45psi. The HIGH side reads 50 with the compressor on and off.

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Monday, June 10th, 2013 AT 2:29 PM

SATURNTECH9

MECHANIC
30,870 POSTS

That's not good the readings are the same with the compressor running or not also there almost equal that's not good ether. The pressures are equal with the compressor running you have a bad compressor. Are you the compressor is running the center of the compressor is spinning?Also with the compressor off both the high and low side should both read 100psi or more if the system is properly charged. Sounds like its low on charge. You cant go by pressure while the compressor is running to see if its charge correctly its by how much weight of charge is in the system.

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Monday, June 10th, 2013 AT 6:25 PM

OAKTREE71

MEMBER
3 POSTS

Sounds about right, got the car for free and tryin to get cheap easy a/c for my kid. Guess I'll work on swappin the PCM first. Neither the cooling fan nor the a/c compressor work without jumping the relays. Thank you very much

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Monday, June 10th, 2013 AT 6:35 PM

SATURNTECH9

MECHANIC
30,870 POSTS

Don't swap the pcm they hardly ever fail on those cars haven't replaced that many in my 16 plus years working for Saturn. The reason you have to jump the high/low pressure switch is because its low on charge if its only reading 45psi with the compressor off. So the pcm and pressure switch is doing its job.I would start by charging it up with some leak dye and see what the pressures read?Also if it leaks out you can use the dye to locate the leak.