Diagnostic Aids

For full scale readings, gauge may be indicating correct coolant temperature. Problems not covered by this diagnostic table include following:

• Low coolant level.
• Improper coolant mixture.
• Coolant leaks.
• Faulty coolant pump.
• Faulty thermostat.
• Gasket failure.
• Lack of lubrication.
• Lack of cooling fan operation.

This table covers problems with gauge circuit, gauge, and sending unit, but not problems which cause actual overheating or underheating.