1977 C10 Factory A/C INOP - The 1947 - Present Chevrolet & GMC Truck Message Board Network

zach_carver · 07-06-2018, 11:58 AM

Ive got a 77 c10 silverado with factory a/c. Everything is under the hood complete but a/c compressor pulley has come apart and there is no belt on it. I would like to get it back working but I know very little about a/c. I know I need a compressor but Id rather not spend alot on it right now because I plan to eventually LS swap it so it will all be taken back off eventually. It has a all orginal 350 if that matters and I believe a A6 big compressor currently.

**hatzie** · 07-06-2018, 02:45 PM

Does the centre of the compressor pulley turn or is it seized?
The A6 is a pretty tough critter. They eventually wear out but they take a heckuva beating before they do.

Dead Parrot · 07-06-2018, 05:12 PM

Assuming it is just the AC clutch assembly that is broken, that is replaceable without replacing or removing the compressor from the vehicle. The replacement doesn't even break the freon seal.

Put a gauge on the system to see if any refrigerant is in the system. If there is, your seals and hoses might still be good. If not, do a vacuum leak test. If that proves out, then proceed with the clutch replacement. If the hoses to/from the compressor are original, they are most likely EOL and need replacement.

A few tests before you start might prevent the compressor repair, then finding the hoses are shot and need replacing, then a new dryer and orifice/filter tube.

If it hasn't been converted to 134, now would be a good time.

zach_carver · 07-06-2018, 08:59 PM

Yea I just checked it and everything spins pretty easily I can spend it by hand. This is what i was looking for you guys are slick. I didnt know that pulley could be replaced easily. I figured it would need a new compressor

zach_carver · 07-06-2018, 09:01 PM

I kinda doubt it does still have any freon being that it has sat in a scrapyard for years until about 6 months ago. All lines and wires all appear to be untouched though so I may dodge a bullet lol

07-06-2018, 11:58 AM	#1
zach_carver Registered User Join Date: Aug 2014 Location: Blue Ridge,GA Posts: 508	1977 C10 Factory A/C INOP Ive got a 77 c10 silverado with factory a/c. Everything is under the hood complete but a/c compressor pulley has come apart and there is no belt on it. I would like to get it back working but I know very little about a/c. I know I need a compressor but Id rather not spend alot on it right now because I plan to eventually LS swap it so it will all be taken back off eventually. It has a all orginal 350 if that matters and I believe a A6 big compressor currently. __________________ 1965 C10 LS2/4l70, WHITE, 5/7 DROP LINK TO SUPER SNOOPY C10 BUILD---> http://67-72chevytrucks.com/vboard/s...d.php?t=689283 1977 C10 SILVERADO HAWAIIAN BLUE, 5/5" DROP, LS6/4L80E 1976 CHEVY K5, 350/350, YUBA GOLD/SADDLE

07-06-2018, 02:45 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 1977 C10 Factory A/C INOP Does the centre of the compressor pulley turn or is it seized? The A6 is a pretty tough critter. They eventually wear out but they take a heckuva beating before they do. __________________ 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.

07-06-2018, 05:12 PM	#3
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,620	Re: 1977 C10 Factory A/C INOP Assuming it is just the AC clutch assembly that is broken, that is replaceable without replacing or removing the compressor from the vehicle. The replacement doesn't even break the freon seal. Put a gauge on the system to see if any refrigerant is in the system. If there is, your seals and hoses might still be good. If not, do a vacuum leak test. If that proves out, then proceed with the clutch replacement. If the hoses to/from the compressor are original, they are most likely EOL and need replacement. A few tests before you start might prevent the compressor repair, then finding the hoses are shot and need replacing, then a new dryer and orifice/filter tube. If it hasn't been converted to 134, now would be a good time.

07-06-2018, 08:59 PM	#4
zach_carver Registered User Join Date: Aug 2014 Location: Blue Ridge,GA Posts: 508	Re: 1977 C10 Factory A/C INOP Yea I just checked it and everything spins pretty easily I can spend it by hand. This is what i was looking for you guys are slick. I didnt know that pulley could be replaced easily. I figured it would need a new compressor __________________ 1965 C10 LS2/4l70, WHITE, 5/7 DROP LINK TO SUPER SNOOPY C10 BUILD---> http://67-72chevytrucks.com/vboard/s...d.php?t=689283 1977 C10 SILVERADO HAWAIIAN BLUE, 5/5" DROP, LS6/4L80E 1976 CHEVY K5, 350/350, YUBA GOLD/SADDLE

07-06-2018, 09:01 PM	#5
zach_carver Registered User Join Date: Aug 2014 Location: Blue Ridge,GA Posts: 508	Re: 1977 C10 Factory A/C INOP I kinda doubt it does still have any freon being that it has sat in a scrapyard for years until about 6 months ago. All lines and wires all appear to be untouched though so I may dodge a bullet lol __________________ 1965 C10 LS2/4l70, WHITE, 5/7 DROP LINK TO SUPER SNOOPY C10 BUILD---> http://67-72chevytrucks.com/vboard/s...d.php?t=689283 1977 C10 SILVERADO HAWAIIAN BLUE, 5/5" DROP, LS6/4L80E 1976 CHEVY K5, 350/350, YUBA GOLD/SADDLE



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.