AFS1
Member
- Posts
- 89
- Location
- Middlesex, England
So the expansion tank has the coolant level half way between min & max. Run engine at tick over for 10 minutes and coolant level rises, up to the welded join in the expansion tank. The by-pass thermostat is hot on the top side, but cold on the bottom, therefore the thermostat not opened. Coolant temperature running between 88 - 90 degrees (according to Hawkeye). No fans running (as expected - aircon was off). Temp drops from 90 back to high 80's and the by-pass thermostat is warm at the bottom (suggesting thermostat starting to open). Is the coolant level in the expansion tank rising a cause for concern or is this just the effect of the coolant getting hot? By the way having the heater setting to hot or cold (without heater fan) didn't make a difference to the coolant temperature reading. Switched off engine and half an hour later, coolant level in expansion tank back to half way between min & max..... or am I just getting paranoid???