Question about 1998 Chevrolet Monte Carlo
Take it to the dealer, there is a GM Bulliten out for this issue on all new W body cars, most notably the Monte Carlos and Impalas. It's air getting trapped in the system causing a blockage of flow for the heater under low pressure/idle situations.
What you gotta do is jack up the RH side of the vehicle about 1ft off the ground or so...then with the vehicle idle-ing w/heat on, bleed the system at the fill port. There's a little more to it then that, but tilting the vehicle to help get the air out is part of the trick.
Posted on Dec 09, 2008
This could be a low coolant problem or a partially plugged heater core, I would check the coolant level first.
Posted on Dec 06, 2008
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Posted on Jan 02, 2017
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