This is a 2000 Bonneville with manual controls. Blower operates properly. Radiator is full and both lines to the heater core are hot. The air conditioner works fine and its temp can be adjusted with temp adjust ****, but I have no heat at all. I checked the actuator on the driver'* side, which adjusts whether air comes out the defrost or vents and it works properly. I checked the air mix actuator that works off the temp adjust **** and it works correctly, too. The air inlet actuator does not seem to be working, but it seems that I should have some hot air even if this in the outside air position. Are there any other actuators that could be stuck to only allow the air conditioner air through? Any suggestions would be greatly appreciated. Thanks.

Drive you car around for awhile and see if the temp gauge goes up. Let me know if it reaches a normal temp (around 195 degrees F) or if it stays low. I know in my 2003 bonnie the car will not allow the blower to operate until the engine reaches a certain temp (this may only be with automatic climate controls though). It'* possible that your thermostat is stuck open which could cause your car to not heat since the engine is not heating up to optimal temps.

The blower works fine and I think the temp is OK, but the next time I take it out I will check it out. I don't know why I did not think of the thermostat. It has been a long time since I have worked on any of my cars. Thank you for reminding me of that potential problem, I hope it is that simple.

After driving some distance, the temp guage was around 150 degrees. This seemed low to me, but not terribly bad. I replaced the thermostat, which got the temp up to 200 degrees. No real improvement, so any suggestions would be appreciated.

The problem was with the heater core. I drained the anti-freeze and then removed the hoses to the heater core. I used my air compressor and blew about a 100 psi through both hoses. The first attempt blew out mostly anti-freeze; I reversed the order and some small chunks of rusty looking gunk came out. The heater works great now.

glad to hear you solved the problem. I was going to say it sounded like a heater core issue.

You don't mention how many miles on the car. Had the DexCool been changed?

I wonder if the gunk you blew back out was coagulated DexCool from deterioration due to air in the system or from contamination with regular coolant? Either way I would suggest doing a mild flush on the system with a cleaner to remove more DexCool crud if it'* possible that'* the problem. I remember someone posting somewhere that there was a cleaner used for DexCool flushing. It sounded as if it were specifically meant to remove DexCool residue.

Glad to hear that you fixed your problem.