Running Very Hot

[taxidriver108]

Hi
Hoping that someone with more knowledge than me can give me any ideas please. When driving at below 55mph the engine runs at 110 deg C. Any increase of speed and the temp rises until finally the 'Engine Hot' warning light comes on. I have driven it like this for 7k miles. The cooling fan runs at 98%. When the car is stationary the temp drops to 94 deg C. Work completed so far:-
1) Bubble test
2) New Thermostat and housing (This is at rear of engine)
3) New water pump
4) New Radiator
5) Coolant flush
6) Cabin heater matrix flushed.
7) Steel seal used.
New Expansion tank and cap
9) 2nd bubble test
Most of the work was carried out at a garage at great expense.
The cabin heater was running warm but after I flushed it the drivers side is hot, but passenger side only warm. When engine is running, there are small bubbles rising in expansion bottle. My only option looks like scrapping it! Please help to save a Volvo.

[volvolugnut]

Did this problem start after a coolant drain and refill? It sounds like you have air in the coolant system and it is not completely filled. When engine is cold, pinch by hand the top coolant hose to the radiator and see if it bubbles in the coolant overflow tank. Keep pinching until the air is forced out and the coolant level is stable. You will likely have to add more coolant mix.

What is bubble test? I am not familiar with this term.
Has a test been made for exhaust gas in the coolant (sign of bad head gasket).

volvolugnut

[taxidriver108]

Hi
The car was driving perfectly until the 'Engine running hot' Warning light came on, although the radiator fan had been operating at high speed after the engine was switched off for a few months. The Bubble test is another name for exhaust gas in coolant test.

[VeeJii]

Did this problem got solved?
It seems I have the same type of symptoms in my car, but no bubbles in expansion tank (which would seem like a faulty head gasket, imo)