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Old 02-21-2009, 07:57 PM   #1
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Default Air Conditioning Works Sometimes

I was wondering if anyone had experiences this problem and had a fix.

I have a 2000 SSEi with an A/C issue where the air works - but only sometimes. Let me give some details.

Probably about 8 months ago is when the problem first surfaced. I was out of town and I started the car after shopping in a store and pressed the 'Auto' button on the dual climate control console. It started normally and ran for about 5 minutes. I then noticed the car started getting warmer, looked that the display and it changed from showing 'A/C' to 'A/C OFF' and was blowing warm. After turning the unit on and off and pressing assorted button, nothing appeared to help. Finally, I shut the ignition off and restarted the car and the problem resolved itself. It operated normally for about a couple minutes and then the problem repeated the problem all over again. Toggling the ignition would always get the air to restart, however.

After that day, the problem vanished...until this week. The A/C now repeats the problem everyday.

Any suggestions?

Thanks all.

Last edited by gorilla1969; 02-21-2009 at 08:14 PM.
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Old 02-21-2009, 09:40 PM   #2
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That sounds like your refrigerant levels might be low. Have that checked.
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Old 02-21-2009, 10:56 PM   #3
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Quote:
Originally Posted by Danthurs View Post
That sounds like your refrigerant levels might be low. Have that checked.
Most def. There is a pressure switch on either side of the system, if the pressure is out of whack, this switch will turn the compressor off. check the refrigerant and oil level.
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Old 02-22-2009, 08:24 AM   #4
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check to see if there is a leak
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Old 03-02-2009, 01:19 PM   #5
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I purchased a can of refrigerant from the local auto part store which had a built in pressure gauge. After connecting the can to the A/C port under the hood, the gauge measured 25 psi which, as I understand it, is the low end range for a filled system. In another post I read that a guy who refilled his system didn't see any cool air until he filled it to 33 psi. Taking this under consideration, unloaded the entire first can and the gauge moved very little - probably about 3 psi according to the gauge. The system blew cold for about a day and then it repeated the shutting of the A/C off again on the electronic display. I ran down to the store again and emptied another bottle into the system. This time the pressure appeared to bump just over 30 psi. The system has now run for about 2 days and I haven't seen the problem re-occur. Keep your fingers crossed.

Thanks again for all the advice everyone. Hopefully, this will keep the system going for a while - if not, I'll let you know.
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Old 03-02-2009, 01:57 PM   #6
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Hope that'* it. Good luck.
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Old 03-07-2009, 01:17 AM   #7
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I would check the pressure in the system. here is the link to a temperature pressure chart for R134-a. Basically, the pressure of the system when it has not beem running at all is called static pressure, the pressure should be equal on the low and high side. This chart shows you what the static pressure should be at a certain ambient temperature give or take a few degrees. Also, if you want to go further, get a manifold gauge set and hook it up to the car to get both pressures at the same time and compare static pressure with running pressure.

If you have anymore questions regarding A/C, feel free to ask me, I hold my 609 refrigerent license and my A7 ASE.

Pressure - Temperature Chart for HFC-134a
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Old 03-08-2009, 01:01 AM   #8
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Just wanted to check something quick. When your filling your ac do you have the vehicle running with A/C on Max? Your usually supposed to do this when recharging.
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Old 03-08-2009, 02:20 PM   #9
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No. you recharge it with the vehicle and system off through the low side of the system.

Tip: Do not let any air or luquid into the system when recharging yourself. Purge the line before applying it to the service port and hold the can upright to allow only vapor to go into the line. Liquid refrigerant will damage the compressor.

Reason being for the no air in the system is because tou cant condense air like ref, gas. This will cause abnormal pressures in the system and will damage the compressor.
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Old 03-22-2009, 09:38 AM   #10
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After all is said and done, it appears it was a bad pressure switch. The systems works great now.
Thanks Chevyboys and all.
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