1967 AIR CONDITIONING

[Jimmy B.]

My 1967 air conditioning temperature is running about 50 degrees when it is in use. The system would not take a re-charge when it was attempted. Is this possibly a POA throttle suctioning valve problem? What temperature should be coming out when the system is operating nominally?

[Ed Jennings]

Re: 1967 AIR CONDITIONING

Stuck POA valves are pretty common. Got the same problem on my 67. I think a good functioning system should put out air in the low 40* range, but I'm no AC expert.

[Loren L.]

Re: 1967 AIR CONDITIONING

You won't need it in England.

[Jack H.]

Re: 1967 AIR CONDITIONING

Time for ye olde support library purchase, James.... The 1967 Chassis Service Manual (available at the STORE on this website) covers all Chevy cars, including Corvette, and is chock full of 'how to' info. Don't got one for my '65 because the book didn't start to cover Corvette until 1966. But, for my '71, the A/C section is VERY complete with diagnostic tables (they vary by car, configuration, altitude and ambient temp) that enumerate accept/reject range for thermometer probe of a SPECIFIC A/C duct outlet under specific test setup. Spec'd temps vary from high 30F through low 50F range.

Whether another can crack the book and report, you probably oughta contemplate getting/putting this book in your library and CONGRATS on your new Corvette and emergence from the dark and stormy straight-axle era!!!!!!!!

[Craig S.]

Re: 1967 AIR CONDITIONING

Jack is right, you need the service manual. But, from my 67 Chassis service manual, the chart on page 1A-33 shows for Corvette, with a 3lbs 4oz charge, the engine running at 2000rpm, the various head and suction pressures you should see, with the corresponding inlet temps from 70-120 degrees, and outlet temps. Bottom line, with a 70 degree inlet temp, the outlet is 38-40 degrees, with a 150-170 lb head pressure. At 120 degrees inlet, the corresponding outlet temps are 45-47 degrees, with a head pressure of 325-335 psi. Low side pressure is always around 30psi +/1 .5 psi. Don't even mess with your system without a good set of guages.....this said, your outlet temp sounds high...Craig

[Jimmy B.]

Re: 1967 AIR CONDITIONING

Thanks for your response. I think I better find an AC spec. and fly him and his gauges over here to the UK.

[Jimmy B.]

Re: 1967 AIR CONDITIONING

Thanks Jack. When are you & Jim Lennartz coming back to the UK? Could have a nice tech session on this.

[Christopher R.]

Re: 1967 AIR CONDITIONING

The answer Craig Schultz gave you from the factory service manual is the right one.

I can tell you that in New England, a 50F outlet temperature isn't sufficient to keep you cool on any day where you'd feel the need for A/C in the first place. Unless you did your test in the desert, a 50F outlet temperature isn't enough.

[Jimmy B.]

Re: 1967 AIR CONDITIONING

I agree, now who wants to come to the U.K. and fix it for me?

[Jack H.]

Ahem...

when is this last bastion of Bowtie-dom to become an official UK resident????

[Jimmy B.]

Re: Ahem...

In about 4 - 6 weeks.