My 1998 Monte Carlo is overheating. I have replaced the water pump, thermostat, & relays. I have also bled the system of air. It keeps overheating and stays hot and I get no heat at all. I have trouble shot everything according to the book and am not sure what to do next. My low coolant light keeps coming on also but the coolant is not low.

 

I would suspect a head gasket. Are you loosing any coolant? Does the exhaust smell like burning coolant (kind of a sweet smell)?

 

Did you check the thermostat before you put it in? I have gotten brand new thermos that were bad. I would also try and bleed the system of air again. Sometimes you can get a bubble trapped and its real hard to work out.

 

check all the gaskets, when i had a coolant leak it took 5 months to have it figured out. after i replaced the waterpump, thermostat, and heater hosees (which where actually leaking), i took it apart and did the l.i.m's, and it still had the same issue. turns out it was the timing chain cover gasket.

 

Check your heater core

 

If it's a 3.4 I'd check the lower intake manifold gasket. They are known to fail due to a poor design.