CYLINDER HEAD GP 1712803 - Caterpillar

Poor Heating
If the air flow is normal, see "Air flow is normal". If the air flow is short, see "Air flow is short". If the changeover of discharge is poor, see "Changeover of discharge is poor". If the changeover of fresh/air recirculation is poor, see "Change over of fresh/air recirculation is poor".Air flow is normal
Diagnostics
If the temperature adjusting display does not operate normally, see steps 2 and 3. If the temperature adjusting display operates normally, see steps 4 and 5. If water temperature is low, allow water temperature to rise. If water temperature is normal, see steps 6, 7, 8, 9, and 10.
If the link for the temperature adjustment is not engaged, engage the link.
If there is debris that is trapped within the display, remove the debris.
If the wiring is poor, check and repair the wiring. Also, check for an open circuit. If necessary, repair the wiring.
If the servomotor is poor, replace the servomotor.
If there is air that is mixed into the hot water circuit, remove the air.
If the piping is clogged or bent, repair the pipe or replace the pipe.
Outside air is abnormally low.
If the engine coolant is low, refill coolant to the correct level.
If the heater core is broken, replace the heater core.Air flow is short
If the blower motor rotates, see "Blower motor rotates". If the blower motor does not rotate, see "Blower motor does not rotate".Blower motor rotates
Diagnostics
If the rotation is correct, see steps 2, 3, 4, 5, 6, and 8. If the rotation is slow, see steps 9, 10, 11, and 12.
If the recirculation filter is clogged, clean the filter.
If the fresh air filter is clogged, clean the filter.
If an obstacle is logged at the inlet port, remove the obstacle.
If the blower motor is distorted or broken, replace the blower motor.
If the evaporator is frosted and there is voltage that is applied to the magnetic clutch, see 7. If the evaporator is frosted and there is no voltage that is applied to the magnetic clutch, the magnetic clutch is poor. Replace the magnetic clutch.
Check the clutch circuit. If necessary, replace the clutch relay. Check the wiring of the frost sensor for a short. If necessary, repair the wiring. Check the characteristics of the frost sensor. If necessary, replace frost sensor. Check the gap between the frost sensor and the evaporator. If necessary, adjust the gap distance. See "Specifications".
If there is debris on the evaporator surface, clean the surface.
If power voltage drops, check the battery or check the charging surface.
If there is poor contact with the battery terminal, repair the terminal.
If the blower motor is poor, replace the motor.
If the blower high relay is poor, replace the relay.Blower motor does not rotate
Diagnostics
If the blower motor rotates only in the HI speed, see step 2. If the blower motor does not rotate in the HI, or Lo speeds, see steps 3, 4, 5, 6, 7, 8, and 9.
If the resistor has an open circuit, replace the resistor.
If a fuse has an open circuit, repair the fuse.
If