I go to work in the morning with the air on.When I get off five hours later ( I work part time ) start the truck turn on the air it blows warm.When the air starts to work the vent temp are cold,the same goes if the engine is off for only an hour or less.When I start the engine and drive off right away it only takes about a minute to start cooling.Also the compressor is engaged while it is blowing warm air.I ahve checked just about everything even the vacuum hoses.Like I said previously I changed the compressor three times and also the dryer.,pressure switches,flush system.This has been going on for ten years.I was thinking that some how the heater door is opening for some reason.
You are not being an ***,you are just trying to help me.