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Your heater core is likely bad
Check coolant level? Heater core plugged restricted, or airbound? Defective thermostat? Water pump not circulating coolant? Heater control cable not adjusted properly?
I am have the same problem with my 06 Monte Carlo LT. Took to the dealer. Its a head gasket leak.
Coolant leaking onto the floor of the passengers side or out drain tube for a rupture no heat for a blockage.
If it's interior heat you are talking about, it could be the thermostat. If you find your temp gauge is fluctuating all over the place, change the thermostat. If not, it could be your heater core. You could try flushing it out.
The dimmer switch, on your 2001 Chevrolet Monte Carlo, is located on the lower left hand portion of the dashboard. The dimmer switch is just below the heat vent.
500-600 RPM 600-700 With AC or Heat on high.
you have a blown head gasket
the best possible guess I could think of is mice... If it's a chemical smell, you might have a heater core leak. If it's a mildew smell, maybe you have an interior air filter that is funky.
Heater core may be defective
A 2003 VW Passat will have no heat when the heater core is defective or obstructed. This prevents hot air from getting into the vehicle's cabin.
Turn on heat, on high till car warms up.let it cool down that may do the job... Check fuild.