05 plate mg zt overheating

Originally Posted by Peter f.0151

I have a 05 plate petrol zt 1.8 turbo that keeps overheating every 20-30 miles despite head gasket being done new water pump new thermostat , new expansion tank cap , coolant sensor. Car has been pressure tested had a sniffer test ,radiator ok electric fan working. Car does not overheat if left ticking over for an hour the temp goes to 104 deg then the fan kicks in and cools down , but if driven steam pours from expansion tank after 20-30 miles. When the head gasket was done I got about 1400 miles before the problems started. 2 garages can not find any problem with the car can anyone please help

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