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Low pressure pressostat 94 945 Regina 900 1994

posted by  someone claiming to be Beforemountains on  Mon Jun 15 20:50 CST 2020 [RELATED]

Is the fan supposed to run at low speed when the ac is engaged? The fan only turns on when the high side reaches 350psi when the ac is engaged. Low and high pressures are a lot higher than they should be and cooling is less than optimal.

I can ground high, low, and engine temp sensors and the fan actuates. Therefore, not a relay, wiring or fan issue, and I expect the low pressure pressostat is faulty but I do not know how to diagnose a pressostat and i also do not know the psi level where the low pressure pressostat should ground the fan relay. When I ground the low speed fan circuit, ac levels are where they should be and cooling is much better.






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