How to turn your heater core off and on in the cab.

[Waterloo]

It is nice to have cold air up front. The hoops I have had to jump through to get any out of mine have been very costly, time consuming and down right annoying. Glad to have helped! Moving the ambient air temp sensor is another trick I learned. I dug mine out from the harness under the radiator and moved it up to the cowl by the driver door. I don't know if I mentioned that, I am sure I did. That was my first step to a functioning AC system.

Also, do not use dye in the AC system, just straight refrigerant and some PAG oil. The dye kills the system in short order, no cold air, at least in mine.