DIAGNOSIS G Heat ther No control over heat output Thermosta Wiring at Heat ther Heat output too low Fuel line Fuel press Heat output too high Heat ther Heater burns continuouslv lieat out Fuel press put too low Nozzle or Combustio Wiring Continuous excessive smoke from Combustio heater exhaust during heater oper Combustio ation Nozzle Purge swil Poorly so denser 1 Contamina Breaker points burned pitted or material blued Binding of arm Breaker p or less t High curr Excessive smoke from heater ex haust only when heater starts or Fuel valve cycles on Exhaust p Noisy combustion leaks at Nozzle Lack of re Burner cls Odor of burned gasoline exhaust leakage gas in car Exhaust t Heat exch A Wiring The heater fuses are located under the left side of the instrument panel on a fuse block Three fuses are provided for the heater system a 20 amp fuse in the ignition circuit protects the entire heater system and back up lamp circuit while a 10 amp fuse in the battery circuit protects the combustion blower and glove compartment lamp and courtesy lamp circuit in a circuit through the purge switch The control lamp circuit utilizes the 3 amp fuse provided for the instrument panel lamps UIDE Continued mostat control cable D t for shorts D switches A mostat control cable thermostat D K ure K mostat control cable thermostat D ure K uel system M n air hose C A n blower motor ground C n blower motor for slow speed C M ch I dered condenser joints broken con ads or shorted condenser E tion of the points with oil and other E nylon bushing used in movable contact E int cam opening the points too slowly aan 015 E nt caused by excessive voltage E for leakage M pe burner clamp for looseness or air clamp N M sonance holes N mp heater exhaust ferrule for N ibe N mger O The heater is controlled by control knobs located on the instrument panel The heater will be operated combustion blower and ventilating air blower will run by pushing the FAN lever The burner of the heater will operate only when heat is desired and the thermostat located in the air distributor is calling for heat The thermostat may cycle the burner on and off rapidly several times per minute in mild weather with the on time depending upon the heat required The heater will not operate without the FAN control lever in the low or high position