The heater blend door is not run by vacuum. It is run by an electric actuator.
Low on coolant (leak in coolant system) Thermostat stuck open Heater core plugged Temperature blend door actuator failure Vacuum supply to HVAC dissconnected
The heater temp blend valve is located behind the dash assembly. The dash assembly must be removed to gain access.
It does not use a cable. The heater blend door is operated by a electric motor. The complete dash assembly needs to be removed to gain access to the unit.
The heater control valve (temp blend door) is located behind the dash assembly. The dash assembly has to come out to gain access to it.
Changing the heater temp blend door actuator requires removal of the dash assembly. Big Job. You will need a shop manual to attempt that one.
Yes it could and so could a stuck open thermostat or a plugged heater core or a faulty temperature blend door actuator.
Remove the dash assembly to gain access to the blend door actuator.
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.
The temp blend door actuator is probably at fault.
In a 2001 Chevy S10, the blend door vacuum is typically sourced from the engine's intake manifold. A vacuum hose connects the manifold to the HVAC system, allowing the blend door actuator to receive the necessary vacuum to function. If there are any issues with the blend door operation, it’s important to check this vacuum line for leaks or blockages.
Control problem, blend door not working are the places to start
The temp blend door is located in the HVAC box behind the dash assembly. The dash assembly must be removed to gain access.