Location of high and low refrigerant pressure switches

Location of high and low refrigerant pressure switches

Postby N6KB [OP] » September 11th 2019, 1:50am

I'm troubleshooting failure of my a/c in 2005 Astro. The compressor clutch is actuating intermittently. Probably have a leak I need to fix and then evacuate and recharge the system. I can see where one pressure switch is located on the accumulator, but I have not found the other one. Where is it? And which one is high pressure and which is low pressure?
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Re: Location of high and low refrigerant pressure switches

Postby AstroWill » September 11th 2019, 2:31am

I highly recommend grabbing the GM Techline eSI, aka digital factory service manual(see link in sig).

High side switch is on the back of the compressor.

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Re: Location of high and low refrigerant pressure switches

Postby Sailing_Faith » September 11th 2019, 4:42am

AstroWill wrote:I highly recommend grabbing the GM Techline eSI, aka digital factory service manual(see link in sig).

High side switch is on the back of the compressor.


Searching is a good bet too.

Thread asking where the AC Low pressure switch is located

And the answer from that thread;

Big_kid wrote:It's under the hood, on the accumulator(the aluminum "coffee can"). It is round and has 2 wires coming of it. They're green, IIRC.
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Re: Location of high and low refrigerant pressure switches

Postby Mmusicman » September 11th 2019, 2:17pm

N6KB wrote:The compressor clutch is actuating intermittently. Probably have a leak I need to fix...

99% chance you have a leak and are simply low on freon, which cause the compressor to cycle. This is common and expected.

About the only ways I know to pop the high side is to loose your fan while idling (no air flow across the condenser) causing a massive spike in high-side pressure. Blockage in the system would likely cause this condition as well.

Buy a set of gauges (cheap online or even locally) and see what the problem is. If you're going to do your own A/C work.. this is essential. Of course you can also just go to Walmart and buy an R134 refill kit with gauge (only tells you about low side).. good for a novice quick fix.
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Re: Location of high and low refrigerant pressure switches

Postby Sailing_Faith » September 11th 2019, 5:56pm

I agree with Musicman, top it up and see what you get.

You might also take a look at yourhigh pressure port, it is a known source of leaks.
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Re: Location of high and low refrigerant pressure switches

Postby N6KB [OP] » September 11th 2019, 7:23pm

Thanks AstroWill for the links. Lots of information there. Very helpful!
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