1998 Other Saturn Models A/C Compressor does not engage

Tiny
JUPITER55
  • MEMBER
  • 1998 SATURN
Air Conditioning problem
1998 Other Saturn Models 4 cyl Automatic 108000 miles

My Saturn SL2 has been a peach (opposite of a lemon), but now the air conditioner isn't working. When I turn the A/C button on, the light on it turns on, but the compressor clearly does not- there is no compressor noise and the engine RPM stays exactly the same. So I'm thinking it's a blown fuse or other electrical problem. Once I get into the fuse box- where should I start looking?
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Wednesday, April 23rd, 2008 AT 11:45 AM

4 Replies

Tiny
AUTOFRANK
  • MEMBER
Generally, I check under the hood first, looking for any sort of oily residue around the A/C compressor, the lines and the condensor. If I see a dirty buildup anywhere I suspect the system has leaked down. The pressure switch will not allow the compressor to run if pressure is too high or too low. Next if no evidence of leaks are visible I check all fuses to make sure none are blown or missing.A visual check is ok, but testing with a test light with ignition on will quickly reveal a bad fuse. If all fuses are intact, then it may be a relay or the system may need to be checked by a professional. Most shops will offer an a/c inspection for a fair price.
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Saturday, April 26th, 2008 AT 8:58 AM
Tiny
JUPITER55
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Thanks Frank,
I found no evidence of leaks. If the pressure was low, wouldn't the engine still rev up before the compressor tries to engage? The a/c fuse looked good but I swapped it anyway, no change. I swapped the a/c relay with one that was definitely working, no change. I'm told there is an inline fuse for the a/c hidden somewhere under the hood- can you confirm or deny this rumor? If there is, how can I find it?
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Saturday, April 26th, 2008 AT 10:54 AM
Tiny
AUTOFRANK
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If your refrigerant is low, it basically locks out all your A/C functions so nothing will happen. There may be an inline fuse, but I cant access any information today. If its a fuse link that you may be looking for it is tied into the main battery cable found at the starter.I check them by giving them a tug, if its blown the wire will stretch and pull apart, I suggest you pull the battery negative cable to aviod any shorts.
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Saturday, April 26th, 2008 AT 3:58 PM
Tiny
JUPITER55
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Yep, you were right, the R134 was low. I figured my car wasn't smart enough to do that. Thanks for your help.
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Friday, May 2nd, 2008 AT 4:38 PM

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