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The high side pressure on your auto ac is reading over 400 psi when the ac is on what could be the cause?
Wiki User
∙ 15y ago
A defective fan control, broken fan belt, dirty or blocked condenser coil, incorrect refrigerant, refrigerant overcharge and also the fact that the car is not moving and the hood is open while you are checking it causes the ac system to lose the benefit of the airflow it would normally have by forward movement. 400 psig is way too high.
Wiki User
∙ 15y ago
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