What do I need in order to add freon (R12) to my Corvette? I have 3 cans of freon, but no local mechanic will touch it. Also, by looking at the tubing under the hood, I can see where the freon leaks. How difficult is it to repair? Can I just tighten up the nuts at the tubing?

SOURCE: The plastic tubing/hose from the

Any auto parts store should carry low pressure hose for this application. MM85

SOURCE: diagram of parts under the hood

I recommend going to autozone.com and register for free,
than go to repair manual.

This sites is a full free online repair manual for your car.
It has how-to-guides, specs, diagrams, and more

SOURCE: Have 1990 corvette with slight oil leak on oil

The problem may very well be fixed by tightening the boltto the factory spec, but what you must realize is the gasket has lost its even shape from extreme temperature changes.being its now thicker in one area as apposed to the next thus causing the leak from shrinkage.retightening the bolts tro specs will mean you are sinking the bolts at an uneven level and possibly warping the pan from ever seating correctly when facing the enevatable and thats replacing the gasket. i suggest just replacing the gasket with a quality aftermarket performance gasket as apposed to the factory gasket from the dealer or local parts store.you will find the quality and reliabilityand the longevity of the performance aftermarket gasket will far eceed the limits of that of the stock one.i know this wasnt a solution to your problem but hopefully i have saved you several hundred dollars from having to replace the pan itself due to the warping issue.

SOURCE: 1979 Chevy El Camino, automatic transmission,

There should be an o-ring type washer on the bolt. It may be necessary to replace the plug or place an o-ring or washer on the bolt.

SOURCE: air conditionerdoesn't cool....added freon....compressor seems to

Get yourself an electronic leak detector. The refrigerant used today has a smaller atomic size and leaks more easily. Most of the switching valves and duct doors are operated by vacuum or electric solenoids. If the mechanic suspects the compressor he may be talking about a gas leak rather than a mechanical problem. Anyway the gas detector and a lot of testing and investigation should reveal the gas leak if there is one. Check all fuses and vacuum tubing. I assume you have already looked at the sight glass. For a start check if the input side of the condenser is hot.