My wife's car air conditioner comes on fine when the car first starts out
then it stops blowing cold air and blows warm air. Then after a while it
will blow cold again and go to warm. The car was converted to R134 and
worked fine for 3 years. The ?service guy added freon but that didn't help.
I'm guessing that there's some kind of in-dash cold air sensor that perhaps
gets too much cold air and then tells the compressor to turn off or the
sensor is defective, or maybe the pipe that directs has a flap that isn't
working properly. I have no manual and wonder if someone can tell me where
to find the sensor. If I'm off track what other things could it be and
where do I look?