Table 3-1. Troubleshooting (Con't).
TEST OR INSPECTION
ONE OR MORE LIGHTING SYSTEMS NOT WORKING.
Step 1. Check position of switch(es). If vehicle is coupled to semitrailer and problem
is with semitrailer lighting system, check intervehicular cable connection.
Place switch(es) in ON position and blackout light switch to NORMAL
position. Connect intervehicular cable.
Step 2. Perform semitrailer troubleshooting.
ENGINE COOLANT TEMPERATURE GAGE INDICATES ENGINE IS OVERHEATING.
DO NOT remove radiator cap unless engine is cold. Remove radiator
cap in two steps. First, place a thick cloth over cap and slowly turn cap
left to first stop. Pause and allow pressure to escape. Turn cap further
left until it can be removed. This is a pressurized cooling system and
escaping steam, hot water, or coolant will cause serious burns.
Step 1. Check engine coolant level in radiator.
Add engine coolant as required (Appendix F).
Step 2. Check system for leaks.
If leaks are found, notify Unit Maintenance.
Step 3. Check f radiator cooling fins are free of mud, snow, ice, or debris.
Remove anything that blocks or impedes cooling fins.
Step 4. Check cooling fan drive belts for looseness.
If belts are loose, notify Unit Maintenance.
Step 5. Check engine oil level.
If engine oil is low, fill to correct level (Appendix F).