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Old 07-22-2018, 11:12 AM   #1
DonP1
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1999 SL2
Default Saturn AC doesn't work

01 SL2 won't hold a vacuum and had an empty system.

Cleaned engine with simple green to remove dye, replaced schrader valves, sucked a vacuum, pumped in a shot of dye, and enough R134 to get the compressor running. Clutch didn't engage. Ran 12v wire from battery to compressor - still won't engage.

99 SC2 - holds a charge but leaks slowly.

Cleaned engine with simple green to remove dye. Hooked up manifold gauge and filled with one shot dye and R134. Could tell that schrader valves need to be replaced, but system had existing R134. Clutched engaged, but no pumping action observed with the manifold gauges.

i have a 99 SL2 that had working AC when retired 2 years ago. No longer works now. Thinking of trying to get it to work, see if the compressor pumps. If so, swap it into the 99 SC2 and replace the schrader valves. Suck a vacuum and if it holds, refill.

Else, throw in the towel on both.

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Old 07-22-2018, 12:13 PM   #2
fdryer
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2003 L-Series 3.0L Sedan
Default Re: Saturn AC doesn't work

Your '01 compressor clutch coil is blown after supplying it with 12v. You can measure coil resistance, 3-4 ohms to be sure it's blown if a meter reading doesn't register a value.

The '99 leaking doesn't need dye or refrigerant. A shot of anything means nothing. What's actual pressures on this leaking system? And the S-series requires running at 2k rpm for any meaningful pressure observations. No one drives at idle speed. GM states in service manuals to observe pressures at 2k rpm.

To avoid wasting more refrigerant, replace the service valves, evacuate the system for 15-20 minutes, shut off vacuum and observe both needles. If vacuum won't hold, a leak still exists.

Last edited by fdryer; 07-22-2018 at 12:21 PM..

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