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troubleshooting older car

Kelly on Wed August 19, 2009 2:41 PM User is offlineView users profile

Year: 1971
Make: chevrolet
Model: corvette
Engine Size: 454
Refrigerant Type: R-12
Country of Origin: United States

I have a old corvette a 1971 model that is all original. The car set up for about 10 years, I am slowly getting it up and running . It has its original AC parts all with R-12. I need some help with trouble shooting the system. As of now I can not get the compressor to engage . I would love to hear some tips on bringing up a system that has been out of service for some years. The AC system has not been opened. Also I have some, R-12 but was thinking about using freeze 12 in it. Any thing you could tell me would be much appreciated

Kelly

knightgang on Wed August 19, 2009 2:50 PM User is offline

First thought is that there is a small leak in the system and it has possibly leaked down and does not have enough pressure to allow it to engage. Or, it could be an electrical issue.

Post the system pressures and we can go from there.

NickD on Wed August 19, 2009 3:11 PM User is offline

Freeze12 is out, will destroy your system, mostly R-134a that will tear apart your accumulator destroying your compressor. Stick with R-12 and

Would be so much easier for me to open the hood and peek in, 60's and 70's were again changes in system for GM, think it's too late for the POA system, sounds right for the STV. A-6 for the compressor held true for many years. All used an expansion valve and the compressor ran continuously. Can you post some photos?

1971 was the last year of the 10.5:1 compression ratio, distributor and ignition points, that was replaced in 72 with solid state, and EGR valve and a catalytic converter to burn that new lower octane unleaded gas. Adding an HEI, and 10SI was easy, had to find an intake manifold with an EGR and carburetor for a 72, and forget about the catalytic converter. Canadian head gaskets would lower the CR to about 8.9:1 without any noticeable difference in performance of fuel economy. Kind of hard to find leaded octane gas even back then, impossible today.

Dougflas on Wed August 19, 2009 6:22 PM User is offline

Check to see if it uses a thermal limiter switch. They go bad. They are physically black about 1 inch by 2 inches have 3 leads on them. Usually located at the compressor with a clip that attaches to the suction line.

Prospeeder on Thu August 20, 2009 12:14 PM User is offlineView users profile

lol freeze12 is just R134a with R12 fittings arnt they

-------------------------
1990 Pontiac Turbo Grand Prix
1990 Pontiac 6000 LE V6
Both have R12 A/C

TRB on Thu August 20, 2009 2:53 PM User is offlineView users profile

Quote
Originally posted by: Prospeeder
lol freeze12 is just R134a with R12 fittings arnt they

80 percent R134a
20 Percent R142b



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