Hello. Thanks for the doantion. Much appreciated
On all models except "C" and "K" series, vacuum actuators control mode valves to regulate flow of air through heater unit. On "C" and "K" series, mode valves are controlled by a cable mechanism.. Check the vacuum lines to the mode doors. If vacuum lines are good the heat door may be jammed or broken
MODE SELECTOR
VENT Mode
Air is directed to instrument panel outlets.
BI-LEV Mode
Air is directed to instrument panel and floor outlets. A slight amount of air is directed to defrost and side window defogger outlets.
HEAT Mode
Air is diverted to floor outlets, to heat passenger compartment. A slight amount of air is directed to windshield and side window defogger outlets.
BLEND Mode
Air is divided between instrument panel and floor outlets, with a slight amount of air going to defrost outlets.
DEF Mode
Air is directed to windshield defrost outlets. A slight amount of air is diverted to floor outlets and side window defogger outlets.
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Sunday, August 15th, 2010 AT 3:25 AM