Quote:
Originally Posted by pitbullvassar
I have a 98 jimmy. I have had a problem for a few years. When it is cold out and I turn the heat on, it will warm up. But unlike when you get to hot and turn it down or off, I will find myself chilly and feeling the cold air out of the vent. It is kind of cyclical (it blows hot for a half of a minute, then cold for half of a minute).
Any ideas? It's getting cold out
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are the lower intake gaskets leaking, such a common problem on these. but another thing to check which is also a big deal on these, when its at operating temp, grab the heater core hoses, on the firewall, pass side, 2 hoses coming out just above and beside the distributor cap. if one is hot and one cold, or one is warm and the other not, then there is a blockage in the heater core, and it needs to be backflushed. if so unhook lines at the front, one on water pump and one on pass side of intake, water hose, flush one way till water comes out other hose, then flush other hose till water comes out the other one.