How to delete the troublesome heater control valve on a 90’s XJ
My 1991 Jeep Cherokee had the fragile plastic heater valve. Not only can this valve break and leave you stranded, it is prone to leak at the valve actuator. I have replaced mine a couple of times already so this time I decided to do away with it for good.
After replacing my engine, I had to reconnect the AC lines and replace the freon. The system was originally designed to run R12 but I swapped over to R134 a long time ago. However, I still like to use my old gauge set on the R12 style fittings. I just adapted the yellow hose to fit the R134 cans.
I installed a new dryer and reconnected the hoses using new O rings where the old ones looked bad. I then hooked up my vacuum pump and pulled al the air out. I shut off the pump and closed the valve to see if it would hold. It held vacuum so I assumed no leaks and popped in the first can of freon.