Location of heat mix door on 2004 chevy astro

SOURCE: 04 Chevy Avalanche Driver's heater blowing cold all the time

your mode actuator is stuck. try unhooking battery for a few minutes when you hook back up actuators will do a relearn.if this does not work will need to have replaced

SOURCE: 2001 tahoe front heater not working, rear heater blows warm air

Notorious for plugged heater cores. Also updated plastic restriction couplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.

SOURCE: 2004 chevy silverado 1500 a/c heater

when my truck is at an idle, it won't put out any heat in the cab, same thing in the summer with the A/C, what's the fix for it ?

Eric

• 25 Answers
• Posted on Dec 08, 2009

SOURCE: chevy astro van heater blowes only cold air

the problem is probably the heater core, it can become clogged with dribris. this stops heat from the engine getting to it and then no heat.

William Robinson

• 1547 Answers
• Posted on Dec 01, 2010

SOURCE: My 2007 chevy uplander blows

do you have the heat on up front there two seperate units check to make sure you have it on the proper setting up front