All I use is Firefox and it seems to be working well here.

Rick

Those older hoses are not the "barrier" hoses that the R134A will need. Molecules of R134A are smaller than those of R12 and the 134A will leak out. The R12 compressor oil is also not compatible with the 134A. You will need a Schrader valve "port" kit for the 134A and for best op...

I have a system from Classic in my 70 El Camino with the controls in the dashboard. Hide the Classic temperature and operation controls somewhere else. They are not large, don't need vacuum and are stash-able someplace. Think glove box or maybe under the drivers seat. For money, I bet that Classic w...

I've had vehicles where the evaporator fins start growing a moldy film that smells like gym socks worn way too many times. There is an aerosol chemical in a can that can be sprayed into the evaporator case to kill the mold.

Rick

Most vehicles should turn on the radiator electric fan immediately with the A/C turned on to put cooling air through the fins of the condenser. This limits compressor head pressures and aids in cooling the liquid refrigerant as it flows through the condenser. Put a household fan blowing onto the A/C...

Do your fans have a wattage number stamped on them somewhere or maybe online somewhere? If yes, we can derive the amps. Maybe, let's say = 240 watts? 20 amps x 12 volts = 240 watts.

A clamp on ammeter can also measure amperage though maybe less accurately.

Rick

The Haynes Manual for your Chevelle does not list capacities for R12 or its oil. I have it on competent authority (Team Chevelle web site) that a 1970 A-body with a C-60 compressor took 60 ounces of R12. What compressor are you running, C-60 or maybe an A-6? I cannot find a reference for a 1969 A-bo...

Could also be a blend door "air valve" mixing problem in the dash - heater air mixing with cold air.

Rick

I was at 42-43 F here in Louisiana yesterday at about 150-200 feet above sea level. Very humid air in the summer. I think my temps would be a little lower if it was less humid around here but overall, I'm happy at 42 degrees at the center vent of my 70 El Camino running 2000 RPM in a modern R134 sys...

I'm using a Four Seasons Fan Relay kit - part number 35879 - to make one of the E-fans on my 70 Chevy El Camino kick on the instant that the AC compressor clutch engages. This kit has a special compressor wire that overrides the wait time for the engine temperature to kick a fan on. This also helps ...