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A/c high head pressure low suction - 1994 Jeep Wrangler

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Hi, High head and a low suction pressure can indicate a couple of different things. One, condenser coil very dirty and needs to be washed very well. This will bring your head pressure down but let it run back up to normal engine temperatures. If the head is ok after you clean it, and suction is even lower, you may still be low on charge. If the system is over charged will cause this problem. You may want to clean coil, evacuate unit, and weight in your charge. Charge is critical on a auto a/c. You may also have a restriction in the filter drier or site glass. Go through the basics first. Suction should run about 18 p.s.i. Head will run about 27*F over ambient.If you are running R-12 or 134-A, the pressures will be close on your gauges. Go by your scale on the inner part of your gauge which is temperature. So, for R-12 with an outdoor temp of 90 degrees, your head will be about 150 p. s. i. Remember, the charge is critical. Good luck,
Shastalaker7

Posted on Feb 07, 2010

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