2010XC70 overheating issues
I have exactly the same problem with our 2010XC70D5: Can drive around all day at low speed and car will not bring up message. As soon as you go on the highway or up a steep hill it will bring up the "yellow warning message" and eventually the Red one telling you to stop. Stop the car and the fans run on for 3 or 4 min and she cools down a bit and you can continue (slowly).
There is no evidence of a blown head gasket...no coolant in the oil, no oil or exhaust gasses in the cooling system, no bubbling at any time.
Work done so far:
Coolant system flush including the cabin heater core. Notably prior to the flush, the cabin heater would not produce heat but now is, indicating that there was a blockage. Also there was lots of "gunk" came out of the cooling system.
New water pump and belts.
New thermostat.
New radiator.
New engine coolant temperature sensor.
Coolant system flush (again).
Unfortunately the problem continues to be an issue.
Tearing my hair out!
I am wondering if anyone knows of a safe solution that may break down any further contaminants that are likely still within the cooling system galleries and that may be preventing the transfer of heat to the coolant.
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