Question about 2000 Chevrolet Blazer
Check the hoses that go through the firewall into the heater core to see if they are hot. If they aren't you may have air pockets that need to be bled out of your coolant system. If they are hot, you may have a bad vacuum supply to your blend doors. You should have a vacuum supply hose under the dash toward the center. If you have a good supply, you probably need to tear down and inspect the ductwork and boxes.
Posted on Oct 28, 2008
The "blend door" is probably the issue, however the door itself is actuated by an electric motor located on top of the "heater box". You might be able to see the wiring to the motor from beneath the dash, but you will have to remove the whole dash assembly (trust me it's a pain) to access the screws that attach it to the box.Hope this helps.
Posted on Nov 02, 2008
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Posted on Jan 02, 2017
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