Car runs fine for 30 mins in driveway with no overheating but does overheat when driving upwards of 80kph sometimes. Not game to drive it much as if it is not the head gasket, then driving and overheating etc could lead to it blowing.
Have recently had water pump replaced following visible leak under car and this appeared to help but following a drive on a hot day, the car overheated again and coolant level went down.
I have also changed the coil pack and spark plus and also drained and refilled transmission as I was having other issue with the Cruze (lemon)!
There does not appear to be any coolant in the oil which is clear and level remains the same.
Have previously noted the crumpling of the large radiator hose, which goes back to normal once cool.
Mechanic said that it could be oil cooler/thermostat etc. A second mechanic said that the head gasket is blown, although no bubbling of coolant and no white smoke or sweet smell from exhaust!
Any thoughts? Head gasket or other likely causes. Any help much appreciated.