Problem is that the heater core is the highest point in the cooling system. being a closed system any air that enters is trapped in the heater core. Result, no heat.
Recommended repair is to back flush heater core, refill cooling system making sure all air is released from the heater core. Replacement of the radiator cap at the time of repair is recommended.
GOOGLE!
They did'NT make the Trailblazer in 2000 might you be looking for information for a 2000 Blazer.
I am having the same problem.. I have already had to replace the intake manifold gasket cause it was leaking, still no heat. We will be flushing out the heater core to see if that's the problem. I may have to replace the heater core, we will see.
Heater Airbound? Heater control cable not working? Heater core plugged?
If you are standing in front of the truck with the hood up, it is in the back left corner to the right of the heater resistor.
The most common problem causing a 2000 Blazer to stay on heat is a problem with the blend door. Check the blend door and its control circuit to fix the problem.
No it will not, it will just back flush the heater core and clean it out.
this model does not have a heater control valve, it has a specail thermostat that controls flow.
You can but you still won't be able to get it out.
The heater blend door is not run by vacuum. It is run by an electric actuator.
I also have a 2000 jeep wrangler. This year has a problem with the heater core plugging up. You can either try to flush it out, or just replace the heater core.
Could be, Stuck open thermostat, Low on coolant, Plugged heater core, Temperature blend door actuator malfunction.