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Static pressure

tps500 on Sun September 13, 2009 7:08 AM User is offline

Year: 2002
Make: Chevrolet
Model: S10
Engine Size: 6cyl
Refrigerant Type: R134a
Ambient Temp: 85
Pressure Low: 42
Pressure High: 220
Country of Origin: United States

What should the static pressures be??

When I turn off the A/C the pressures both go to about 90 and after an hour they are 110 and stay there? Is this correct?

Chick on Sun September 13, 2009 7:28 AM User is offlineView users profile

Your static pressure will be close to the ambient temp, meaning after your car warmed up, the temp under the hood will affect the static pressure.. There should be a temp/pressure chart on the board somewhere I don't have one home.. Hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

mk378 on Sun September 13, 2009 9:06 AM User is offline

In a normally charged system, the static pressure is determined by the temperature of a component that contains both liquid and gas refrigerant (a saturated mixture). The problem is of course you don't know exactly which component that will be because you don't know where the liquid is. Unless the car has been parked in a temperature controlled garage for a long time, all the components will be at different temperatures. Generally the liquid will migrate to the coldest part of the system but that can take hours.

The temperature scale on the inside of the gauge dial is the same thing as the saturated pressure chart. This is about the only time you should use that scale.

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