Last week when the weather was hot in the UK (35 degrees) and crawling up the motorway in traffic the air conditioning became warm followed by the temperature of the engine creeping up. I ended up pulling onto the hard shoulder (couldn't hear the engine fan blowing). I did the old trick of putting on the heater and the engine temp dropped like a stone. Once it had dropped I started the engine and drove home (not much traffic so no problems and air con ice cold). The following day (another hot day), I started the car and drove out and could hear the engine fan running (air con ice cold) after 20mins I drove home, once home engine fan not running and air con warm again. Temp crept up. Switched car off and on again, fan came on at full speed to cool engine down. It has been at a garage for a week and they cannot find anything as the problem hasn't occurred . Any thoughts?

Thanks in advance for the replies.

 

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