is it normal for ac line pressure to go up when ac is off?

Asked by May 12, 2012 at 09:54 PM about the 2006 Hyundai Elantra

Question type: Maintenance & Repair

i used a can from autozone that has a guage on it to recharge my ac.  with ac on max and fan on high pressue is in the green and at proper psi. when system is off pressure rises to red is this normal?

1 Answer

3,980

yes it is norml for the low side pressure to rise when the system is off. the high side pressure drops at the same time and the pressures will equalize on both sides of the system. usually somewhere around 80 psi

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