The temp blend door. It is electrically controlled by an actuator. It is located behind the dash assembly.
You need a vacuum pump designed for that purpose.
Are you describing the Air Conditioner Condenser?
AC System probably needs refrigerant added.
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
Any air-conditioner compressor, from a 4.3 liter Chevy engine, will interchange with an air conditioner compressor from a 1997 Chevy S 10. The air conditioner compressors are identical.
Check your anti-freeze levels
Open the hood and its located on the passengers side near the firewall.....
Probably low on charge. You can recharge the system but keep in mind you may have a leak somewhere.
The only access to the heater core on a 96 S10 blazer is by removing the entire dash asm. It is not accessible from the engine compartment. If you are not familiar with disabling the the air bag system, do not attempt this repair.
What causes heat to only come out of the defrost and vent but not the floor of a 1995 S10 Blazer?
What are the steps to change the heater core on a 1991Chevy S10 pickup ?
Replace the radiator cap and be sure the coolant reservoir is kept full to the line, it will bleed itself.