pressure relief valve

Jimmy D · Jun 24, 2024

Is the blow off valve on the back of the ac compressor universal? The replacement compressor on my '91 runs fine, cools fine. Saturday I was doing some clean up on the truck. I started it up after sitting for 4 days and within 10 seconds of startup I heard a very noticeable under hood hiss. I stepped around to see a fine mist coming from the right side of the engine but it quit before I could see the source. I started it again and again within 10 seconds it happened again but I got around to see it was coming from the back of the compressor. It was the blow off valve. This is an off brand replacement compressor with less than 8,000 miles on it. Uncommon failure I guess?

RoyBob · Jun 24, 2024

Mine has done that but to much Pressure in system, do you have a charging set of gauges

caminonut · Jun 24, 2024

Hook up a set of gauges on it and see what the pressure is on the high side, if your orifice tube is becoming clogged, it could build up too much pressure on the high side and caused that safety switch in the compressor to release the pressure.

Jimmy D · Jun 24, 2024

The compressor was replaced 5 or 6 years ago and hasn't been touched since. I don't think high pressure caused it since the truck had sat for 4 days and this happened on a cold start. It has been cooling just fine so I've had no reason to hook up the gauges. This is an off brand unit so I guess it is possible it's coming apart and plugging the orifice tube. I'll have to let it run long enough even if it's spewing out the relief valve.

pressure relief valve

Jimmy D

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RoyBob

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caminonut

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Jimmy D

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