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If your heater setting works, and your fan works, and you just don't get any heat...
Maybe your heater core is clogged. With engine on, turn heater controls to full open/hot. Then turn off engine. Disconnect heater hoses under the hood. Connect a short hose to the "input port" to carry dirty water away from your engine. Connect another hose to the "output port." Shoot water from a hose-end sprayer into the "output" to backflush the core. My heater in 98 Blazer had quit heating. I just had to wash the crud out it it worked fine afterward. (it was going to be a BIG job to take off enough dash parts to get to the core to deal with it)
The vents on the dash will not open when the selection is made. There is some heat coming out on the defrost setting but none on the heat setting
What else can I help you with?
Replace heater core in 1997 Chevy blazer?
how to replace a heater core in a 1997 Chevy blazer
Will a 245x75x15 fix on a 2001 Chevy blazer 2dr?
will a 245x75x15 fix a 2001 chevy blazer 2dr
Where is the location of the heater motor in 1997 Chevy blazer?
Same as a 96 blazer go here.How_do_you_replace_the_blower_motor_on_a_1996_Chevy_blazer
How do you fix a Chevy Blazer starting problem?
trying to fix simular problem
How do you change the heater core on a 1999 Chevy Blazer?
You have to completely remove the dash to get access to the heater core.
How to Flush the heater core on a 2001 Chevy blazer?
pull the handle down
How do you close a stuck sunroof on a 2002 Chevy Blazer?
take it to get fix
Why won't the heater turn off on a 1998 Chevy Blazer?
Maybe a bad switch
Where is the heater control valve on a 2001 Chevy blazer?
Right under the throttle cover.
Why does heater still not heat up on 2000 Chevy blazer after flushing and changing termasate?
Heater Airbound? Heater control cable not working? Heater core plugged?
How do you fix the turn signals on a 97 Chevy Blazer?
Probable causeFlasherFusecontrol lever
How do you fix heater air control on a 2002 Chevy blazer?
The heater temp blend door actuator is located behind the dash assembly, attached to the top of the HVAC box. Unfortunately, the entire dash assembly must be removed to gain access.
