typical Ford heater:
Water always circulates through the heater core
Two 'doors' or circulation vanes in heater;
1. gating door - def, vent, floor
2. blend door - blower out to either heater core or a/c evap or both by
So you operate one at a time while looking at the actuators; the one that
DOESNT move when you switch def to vent to floor is the blend door
Then if the blend door doesnt change when you move temp setting, it's bad
control or tubing problem. If it DOES move but there's no change, the
door has come loose from the actuator shaft.
If you cant get it fixed immediately, disconnect hoses at firewall, and
couple them together so that the heater core is bypassed
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
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