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83ZXT with auto temp control.
NO HEAT AT ALL. Only defroster works...and then only gives COLD air...even with temp control lever in full hot position.
HEAT VALVE appears stuck CLOSED, as follows: Hose under hood which brings hot water INTO cabin is HOT. Hose under hood which brings hot water OUT of cabin is COLD, and has NO WATER in it (with car at oper temp and temp ctl lever full hot position).
Found a leak at heat valve has corroded the vacuum module (which is connected to the heat valve). Could a defective vacuum module here be preventing the air mix door from operating?
Could non-functioning air mix door be causing no heat condition in cabin?
Thanks to all who respond.
NO HEAT AT ALL. Only defroster works...and then only gives COLD air...even with temp control lever in full hot position.
HEAT VALVE appears stuck CLOSED, as follows: Hose under hood which brings hot water INTO cabin is HOT. Hose under hood which brings hot water OUT of cabin is COLD, and has NO WATER in it (with car at oper temp and temp ctl lever full hot position).
Found a leak at heat valve has corroded the vacuum module (which is connected to the heat valve). Could a defective vacuum module here be preventing the air mix door from operating?
Could non-functioning air mix door be causing no heat condition in cabin?
Thanks to all who respond.