Different amount of air in system has different results.
Let us put it into volumes to make it easier to understand.
1 liter or more of air.
Engine would overheat and steam would be pouring into reserve tank. Prolonged use would cause damage to head and gasket.
1/2 to 1 liter of air
Overheating might occur when driving in traffic.
Temperature would go down when moving at moderate speed. High speed driving would cause temperature to go up.
For both above situation, steam would be at top part of radiator and the top tank would fail prematurely as steam is beyond boling point of water/coolant.
Less than 1/2 liters.
Overheating might not be noticeable but temp gauge might fluctuate slightly at times. Self bleeding can occur over a few run and stop situation and air would be bled out resulting in the reserve tank running low.
Monday, June 8th, 2009 AT 9:49 AM