overheating diagnosis - Alfa Romeo Forum
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Hmmm overheating diagnosis

got the car mot'd it was running perfect, when it came back it was splutering. new mass air flow meter was fitted and was running smooth (purring). 156 2.5 ltr v6 24v full service history well looked after, started over heating had head gasket test and came back negative, has had a water pump, radiator and cam belt fitted a few months before mot so had a new thermostat fitted because heaters were blowing cool when the engine was hot........any ideas what could be wrong please???
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Is it losing coolant?
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Could be a blockage somewhere in the system.
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Did they fit the metal impellor waterpump? The plastic ones break off. Probably an airlock. Check the new stat hasn't failed. I got one broken from the factory you say sniff test is negative. I'm quite suprised as if you sniff test any v6 long enough it will fail unless its just had new gaskets. The gaskes weap long before they give up and even then the water and oil very rarely mixes. Its quite common. My GTA runs perfectly but chuck a sniff on it and it will fail. Yet it looses nothing. I've heard of expansion caps failing on the header tank so the water blows put rather than pressurising. Could be the cap. You ren't far from gus at AHM. He'll be able to diagnose it for you. Good luck and keep us posted.

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Describe overheating is it slow gradual or does gauge suddenly rise and drop???

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diagnosis , overheating

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