Diagnosis And Testing: Aeration
If coolant level drops below a certain point, aeration will occur drawing air into the water pump resulting in the following:
- High reading shown on the temperature gauge.
- Loss of coolant flow through the heater core.
- Corrosion in the cooling system.
- Water pump seal may run dry, increasing the risk of premature seal failure.
NOTE:
Combustion gases leaking into the coolant can also cause the above problems.