losing all refrigerant over night.

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rpctmc154
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Joined: Fri Aug 02, 2019 11:21 am

losing all refrigerant over night.

Postby rpctmc154 » Fri Aug 02, 2019 11:44 am

1993 chevy g20 5.7. with rear a/c . pulled a vacuum and got 30in. pulled vacuum for about an hour. let sit for 1 hour with no lost in vacuum. filled with the correct about of refrigerant. a/ c ran nice and cold after sitting over night I have lost almost all of my refrigerant. any ideas of where I may be leaking from that wouldn't show on my vacuum results. there is a small hissing sound coming from the passenger side condenser.which I thought was just the pressure equalization.
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Cusser
Posts: 449
Joined: Sun Apr 24, 2016 6:29 am

Re: losing all refrigerant over night.

Postby Cusser » Fri Aug 02, 2019 12:54 pm

rpctmc154 wrote: there is a small hissing sound coming from the passenger side condenser.


Do you mean "evaporator", like under the dash?
rpctmc154
Posts: 2
Joined: Fri Aug 02, 2019 11:21 am

Re: losing all refrigerant over night.

Postby rpctmc154 » Fri Aug 02, 2019 2:32 pm

no the condenser in front or the radiator
PromiseRing
Posts: 31
Joined: Thu May 24, 2018 2:28 pm

Re: losing all refrigerant over night.

Postby PromiseRing » Sat Aug 03, 2019 11:52 am

It’s very easy for a system to hold vacuum indefinitely, but immediately leak when it sees positive pressure.

You can fill the system with nitrogen and listen for leaks. You could also charge with some UV dye.
GM Tech
Posts: 161
Joined: Fri Apr 22, 2016 7:22 am

Re: losing all refrigerant over night.

Postby GM Tech » Sat Aug 03, 2019 6:22 pm

My money is on the rear a/c lines leaking at a grommet most likely right at the rear wheel. Look for oily greasy leak,,,

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