Section 12-03A: Air Conditioning System, Manual A/C-Heater
1996 F-150, F-250, F-350, F-Super Duty and Bronco, F-Super Duty Motorhome Chassis Workshop Manual
DIAGNOSIS AND TESTING
Symptom Chart — Climate Control System
CLIMATE CONTROL SYSTEM
Condition
Possible Source
Action
Insufficient, Erratic, or No Heat
Low radiator coolant.
CHECK radiator cap pressure. REPLACE if below minimum pressure. FILL to specified coolant level. PRESSURE TEST for engine cooling system and heating system leaks. SERVICE as required. GO to
Pinpoint Test B
.
No Switching Between Function Control Settings
Vacuum leak.
GO to
Pinpoint Test A
.