Under your battery tray
The vacuum switch/actuator for the fan shutter is under the dash directly below the radio . IT is NOT easy to get to.
The heater blend door is not run by vacuum. It is run by an electric actuator.
Remove the dash assembly to gain access to the blend door actuator.
how to replace actuator on a 2000 malibu
No, it is electric
how to replace a heater core in a 1997 Chevy blazer
no
The 1997 Chevrolet blazer actuator switch is located on the firewall in the engine compartment. The switch is on the passenger side of the engine compartment.
how do you replace seatbelt retractor on a 2000 chevy blazer
How do you replace fuel injectors on 2003 Chevy blazer?Read more: How_do_you_replace_fuel_injectors_on_2003_Chevy_blazer
where is the blower motor on a 2001 chevy blazer