- #752 of 791
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Re: 94 Saturn A/C solenoid problem [saturnowner1]
by Mr_Shiftright HOST
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Jun 01, 2009 (6:00 am)
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Replying to: saturnowner1 (May 31, 2009 8:04 pm)
Looks like it's on a T-fitting running along the AC hose---the diagram seems to indicate near the fender as it meets the firewall---I think if you follow the AC line up you'll see a T fitting with a switch that looks like a brake light switch, with an electrical connector.
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- #753 of 791
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Re: 94 Saturn A/C solenoid problem [Mr_Shiftright]
by saturnowner1
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Jun 01, 2009 (6:11 am)
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Replying to: Mr_Shiftright (Jun 01, 2009 6:00 am)
Brrrrr..Up and running: spent $50 this morning at an a/c shop: I was close with my refill job..but as I was filling it I should have rev'd the engine to about 2000 rpm. Once the mechanic did this and added a little more pressure on the fill, the low pressure switch activated, powered the solenoid, and the system ran. As usual, a simple fix by a professional. Thanks again Mr Shiftright for all your help.
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- #754 of 791
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Re: 94 Saturn A/C solenoid problem [saturnowner1]
by Mr_Shiftright HOST
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Jun 01, 2009 (6:14 am)
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Replying to: saturnowner1 (Jun 01, 2009 6:11 am)
Well okay we were on the right track---another 3 or 4 weeks  and we would have solved it!!
Now think of all you've learned.
Anyway, if you had bypassed the low pressure switch, the compressor would have clicked on, telling you that there was low pressure in the system. Where did you get that 45 psi reading from? Oh, you said that was a guesstimate....
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- #756 of 791
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Re: 94 Saturn A/C solenoid problem [Mr_Shiftright]
by saturnowner1
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Jun 01, 2009 (6:32 am)
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Replying to: Mr_Shiftright (Jun 01, 2009 6:14 am)
The recharge kit I bought has a gauge on it, with the blue range ending at 45 psi, and then a yellow band, and then a red band. I stopped pressurizing when the gauge showed 45 psi, which only took a few seconds. When the mechanic did it, he applied a little more than the 45 psi, revved the engine, and then compressor kicked on. The low side psi went way down right away, and started to climb back up. he continued to fill it to about 20 psi, meanwhile the high side came back up into the 100 psi range, and the car cooled off. So now the low side runs at about 20 psi.
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- #757 of 791
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Re: 94 Saturn A/C solenoid problem [saturnowner1]
by Mr_Shiftright HOST
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Jun 01, 2009 (7:04 am)
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Replying to: saturnowner1 (Jun 01, 2009 6:32 am)
Oh okay I understand the sequence now---that makes sense.
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- #758 of 791
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Re: 94 Saturn A/C solenoid problem [saturnowner1]
by obyone
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Jun 01, 2009 (1:14 pm)
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Replying to: saturnowner1 (Jun 01, 2009 6:32 am)
One thing to note is that if you were low on R-134a you have a leak. It may be a small leak and require refills every three months but a leak none the less.
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- #759 of 791
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Pressure differential question
by rockindubya
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Jun 13, 2009 (8:53 am)
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New compressor, dryer and manifold hose on 97 Chevy P/U. Pulled a vaccuum before charging. Old dryer had label that said "Charge w/ 2Lbs. R-134" I only put in 2 12 oz cans that day....Ambient temp was about 68 and pressure was about 30 low and 190 high... worked well until we hit 90 plus degrees (Texas here). My pressures now are 40 and 250.... I added 8 oz and went to 45 and 280!!
pulled that back off and got down to about 35 and 230. Cool but not COLD. Suction line cool, but not COLD. After 30 minutes highway, it DID cool off better, but on a short trip this AM... same situation. Anyone have any ideas?
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- #760 of 791
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Re: Pressure differential question [rockindubya]
by obyone
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Jun 14, 2009 (1:11 am)
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Replying to: rockindubya (Jun 13, 2009 8:53 am)
Did you evacuate the air in the system before loading the R134?
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- #761 of 791
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Re: Pressure differential question [rockindubya]
by Mr_Shiftright HOST
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Jun 14, 2009 (7:30 am)
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Replying to: rockindubya (Jun 13, 2009 8:53 am)
If you are using the gauges that come with the re-fill kit, they are generally not very accurate. DIY service on AC doesn't have a high rate of success.
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