Description:
A heater control valve may be located in one of the heater
hoses to regulate coolant flow to the
heater core. The valve
is usually vacuum-controlled, which is operated by controls
on the dash.
Purpose:
The valve is used help control heater
output.
Maintenance Tips/Suggestions:
Insufficient heat, or heat that can’t
be turned
off
may indicate a problem with the heater control valve. Inspect the valve
to make sure that its vacuum line is properly connected.
If the valve has an external linkage
arm, operate the heater controls and watch to see if
the valve changes position. If you have
any doubts about the valve’s operation, have the heating system
checked by a qualified service professional.
