A/C suddenly lost its charge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Edahall · 08-22-2019, 04:37 PM

The A/C on my Suburban suddenly quit working. I put the gauges on it and it had almost no charge. I recharged it and the charge seems to be holding just fine even after several days. I even used an electronic refrigerant gas detector and could not find anything. I'm pretty sure it was a very large leak for the system to suddenly go flat like that. What could be the cause of this?

**hatzie** · 08-23-2019, 10:33 AM

Rear AC?

Edahall · 08-23-2019, 10:42 AM

Quote:

Originally Posted by hatzie

Rear AC?

Yes it has rear A/C

**hatzie** · 08-23-2019, 10:50 AM

You have a leak somewhere.
I'd look over the rear lines and the connections in those/to those for leaks. Then look over the connections, lines, and parts in the engine bay.

What refrigerant detector are you using?
Not all refrigerant detectors are created equal... You do get what you pay for. Decent units are pricey.
I scraped my pennies, nickels, and quarters together for a Robinair TIFZX Heated Pentode unit a couple years ago. Super sensitive. Worth every nickel.

If you aren't doing AC work for money and you need to be careful of cash take it to someone that has the tools to find the leak.

08-22-2019, 04:37 PM	#1
Edahall Registered User Join Date: May 2011 Location: Goliad, TX Posts: 672	A/C suddenly lost its charge The A/C on my Suburban suddenly quit working. I put the gauges on it and it had almost no charge. I recharged it and the charge seems to be holding just fine even after several days. I even used an electronic refrigerant gas detector and could not find anything. I'm pretty sure it was a very large leak for the system to suddenly go flat like that. What could be the cause of this? __________________ 1990 ¾ ton 4x4 Chevy Suburban -Cummins Diesel - 12 valve - factory rebuilt -6 speed bullet proof manual transmission - NV5600 -Gear Vendors Overdrive - HX35 Holset Turbo -NP205 iron transfer case -3.73 gears -2" Lift

08-23-2019, 10:33 AM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: A/C suddenly lost its charge Rear AC? __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

08-23-2019, 10:50 AM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: A/C suddenly lost its charge You have a leak somewhere. I'd look over the rear lines and the connections in those/to those for leaks. Then look over the connections, lines, and parts in the engine bay. What refrigerant detector are you using? Not all refrigerant detectors are created equal... You do get what you pay for. Decent units are pricey. I scraped my pennies, nickels, and quarters together for a Robinair TIFZX Heated Pentode unit a couple years ago. Super sensitive. Worth every nickel. If you aren't doing AC work for money and you need to be careful of cash take it to someone that has the tools to find the leak. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 08-23-2019 at 10:56 AM.

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