mherbaugh

Okay. There is a high and low pressure switch on these. I forgot to mention sometimes it will only blow hot air when you first start it up. But 90% it’s cold when you start it up

I have a 2000 (new body style) 2500 6.0l with 190,000 on it. The AC has always blown cold as ice. But recently it will only blow cold for the first 5 or so mins of turning the truck on then it will blow hot air. ive changed the relay, blend doors, control panel and low pressure switch but nothing has fixed it. Check the pressure and it is good. And when the compressor is running the gauges are ready properly. The compressor will kick on the first couple times but after that it won’t. If you jump the relay it will stay on and work fine. anyone ever had this issue before?