Re: Help! Cooling fan and a/c compressor... Is there a connection - Saab 9000 Bulletin Board - Saabnet.com
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Re: Help! Cooling fan and a/c compressor... Is there a connection
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Posted by Robert Kaplan (more from Robert Kaplan) on Tue, 7 Aug 2001 10:28:45 Share Post by Email
In Reply to: Help! Cooling fan and a/c compressor... Is there a connection, Vita D, Tue, 7 Aug 2001 09:01:53
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These are very odd symptoms. First, 1 pound of r134a is only half a charge, so the low pressure switch could prevent the compressor from engaging, though in my experience, the low pressure switch will kick out at about 1/2 a pound.

As for low and high side pressures being the same, that would be the case with an internal failure of the compressor. However, if the compressor clutch was not engaging at the time the pressures were checked, the system would have been equalized, and low and high side pressures would have been the same. You would think an ac tech would have noticed the compressor not working, but.........I can't see this kind of failure being intermittent. Either the compressor is toast, or it's not.

The cooling fan could be a factor in this. AC refrigerant, and 134a in particular, is dependent on fully functioning cooling fans. If the fans don't work, there will be insufficient airflow across the condensor at idle and the high side pressure will go through the roof. This will trip the high pressure cut out switch in the ac system, which will turn off the compressor.

So, I would suggest that you don't run the ac (at least at idle) until the cooling fan is operational. Once the cooling fan is working, you should get a proper charge of 134a and see how well it works.

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