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Pressostat code for AC S90-V90 1998

uid 11021's pic
posted by  dewfpo on  Sun Jul 23 05:08 CST 2006
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last visit: Thu Oct 23 18:34 CST 2014
[RELATED]

The situation you describe in the first paragraph is classic for a bad 'dash vent/floor vent' dual acting vacuum servo. Classic. A golf tee in the yellow vacuum line from the vacuum solenoids can confirm this condition.

Before replacing the Pressostat, I would hook up a low side pressure gauge to the port on the accumulator/receiver/dryer ($20 from Wal-Mart) and see if the pressostat is operating between ~25 - 45 psi when the compressor is engaged. When cycling, the compressor should run until the pressure in the low side goes down to ~25 psi and then cycle off until it reaches ~45 psi.

DEWFPO
--
1998 S90 077,400 and 1995 964 154,100






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