AC on my '98 ChevS10
My auto airconditioner blows very cold air when first turned on.
After about 15 minutes warm air comes through the vents?
I turn the AC off and wait about 15-20 minutes or so, then it blows cold air for awhile then turns to warm again.
The mechanic who changed my oil, added a can of freon but that didn't do anything.
Any thoughts on what is happening?