Troubleshooting - Toyota Supra 1990 Manual

CO-4
COOLING SYSTEM - Troubleshooting
TROUBLESHOOTING
Problem Possible cause
Remedy
Page
Engi ne overheats Alternator drive belt loose or missing
Adjust or replace belt CH-3
Dirt, leaves or insects in radiator or Clean radiator or condenser
condenser
Hoses, water pump, water outlet housing,
Repair as necessary
radiator, heater, core plugs or head
gasket leakage
Thermostat faulty Check thermostat
CO-8
Ignition timing retarded
Set timing
IG-20
Fluid coupling faulty Replace fluid coupling
CO-6
Radiator hose plugged or rotted Replace hose
Water pump faulty
Replace water pump CO-6
Radiator plugged or cap faulty
Check radiator CO-9
Cylinder head or block cracked or plugged Repair as necessary