AC PSI for switch to engage

AC PSI for switch to engage

Postby justoneman [OP] » April 30th 2021, 4:35pm

What minimum PSI is needed to engage the low pressure switch? I have jumped the switch and my compressor engages. The relay works as I switched it out on the headlight position and it functions. I replaced the low pressure switch but no magic. I have about 33 PSI. Is that too low to trip the switch?
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Re: AC PSI for switch to engage

Postby Birdshake » April 30th 2021, 4:46pm

I think so.

Static pressure readings should be above 50psi
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Re: AC PSI for switch to engage

Postby AstroWill » April 30th 2021, 7:44pm

justoneman wrote:What minimum PSI is needed to engage the low pressure switch? I have jumped the switch and my compressor engages. The relay works as I switched it out on the headlight position and it functions. I replaced the low pressure switch but no magic. I have about 33 PSI. Is that too low to trip the switch?


That is too low, the low pressure cycling switch is usually about 45-50psi.

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Re: AC PSI for switch to engage

Postby justoneman [OP] » May 1st 2021, 2:34am

AstroWill wrote:
justoneman wrote:What minimum PSI is needed to engage the low pressure switch? I have jumped the switch and my compressor engages. The relay works as I switched it out on the headlight position and it functions. I replaced the low pressure switch but no magic. I have about 33 PSI. Is that too low to trip the switch?


That is too low, the low pressure cycling switch is usually about 45-50psi.
I tried to fill up with the simple can set up. Obviously my system was too depleted. i will take it in to have it professionally charged up. Thanks!
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Re: AC PSI for switch to engage

Postby AstroWill » May 4th 2021, 12:10am

If it's low on refrigerant then it definitely has a leak, that should be fixed before charging.

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Re: AC PSI for switch to engage

Postby justoneman [OP] » May 4th 2021, 12:52am

AstroWill wrote:If it's low on refrigerant then it definitely has a leak, that should be fixed before charging.

I took the Astro in to have it charged. They did a leak down test. System was fine and was replenished. Now I have an Astro that runs nice and has AirCon. Next move I have to deal with the ABS sensors and the re-upholstery of the nasty seats and the nasty headliner.
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Re: AC PSI for switch to engage

Postby AstroWill » May 4th 2021, 2:25am

Awesome! Just in time for it to start heating up across the country.
I mean, it IS a sealed system, the refrigerant can't go anywhere but out. Any oil stains around the compressor/joints/etc? Hopefully it's such a small leak that it will be a long time before you have to deal with it again.

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