I now have about 168K miles on my '92 S-coupe and the heater is beginning to blow cold air after it idles for about 15 seconds. The temp gages reads right in the middle and if I bring the motor up to about 2500 rpm, the heater air again becomes hot. I'd like to think it's simply a waterpump/thermostat issue and not a heater core issue. Am I correct in this assumption? Remember, all this happens after the car has been sufficiently warmed up.
Thanks for all your help.....
Bill
Thanks for all your help.....
Bill