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What does these pressure and fan changes tell me about AC system? 900 1994

posted by  Philip on  Fri Aug 28 08:28 CST 2009
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last visit: Thu Oct 23 10:21 CST 2014
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I put in a rebuilt compressor, dryer and oriface. The AC works OK but not at cold as the original compressor. At idle or stop lights, it is especially lukewarm.

At idle and 90 degrees outside, the radiator cooling fan starts when the low side pressure rises to 45. It stays on for 4 seconds and then the fan stops and the pressure starts to drop. When the pressure drops to 38, the pressure then starts to rise again. In about 10 seconds, the pressure is back up to 45 and the fan kicks on. This cycle then continues on and on.

In comparison, when my other 940T is at idle, the fan comes on and stays on. The pressure stays at 33 without any change. And the air is nice and cold.

Is this a compressor problem, freon problem, or fan problem, or sensor problem?
(when I vacuumed and put r134 in the system, I put in 3 (12 oz.) cans, and the system calls for 30 oz so there should be plenty of r134)

Thanks for any ideas.






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New What does these pressure and fan changes tell me about AC system? [900][1994]
posted by  Philip  on Fri Aug 28 08:28 CST 2009 >


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