Just to say hi, and ask for a bit of help.

I've re-bought a Mk1 MGF I had owned a few years ago, had it repaired together with a new head gasket. However, MGF life is never straightforward. My wife was driving back from work and the car started throwing out white steam from the engine bay, so stopped called the AA who whipped it off to a garage who diagnosed a cracked thermostat which while annoying was understandable. We picked the car up a couple of nights ago, drove back twenty miles with no problem. The my wife was driving into work, covered fifteen miles or so, then stopped at a shop. As soon as she stopped the car belched a huge cloud of white steam out of the rear. There was no sign of overheating beforehand and she limed into work where she called the AA out. The garage they sent out checked the car out, topped the coolant up and then told my wife the car was safe to drove back home [don't worry I couldn't believe the garage said to do so and I rang the AA to double check]. Well the car and wife made it back home with no issues, no coolant loss, no mayonnaise in the oil. So I took it for a test drive for twenty miles this morning, with non signs of steam or overheating. But when I arrived back home to park as soon as I went static steam spewed out of the engine again. Checked the water, it had dumped a good half or more of the coolant and there was oil in the water, nice brown emulsion but the AA, bless their cotton socks, checked the water for exhaust gases and all seemed ok. 

I'm perplexed, as is the AA. Has anyone any suggestions as to what s going on?

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