Quote:
Originally Posted by Yorkshire GOC
As TC says pressurisation in a cold system indicates HGF - so give her a 10/15 minute thrash at motorway speeds - leave her overnight then open the expansion tank cap - if you get a clear audible hiss of escaping gas it points to HGF as exhaust gas is in the coolant system - also smell the expansion tank to see if there are are exhaust fumes present.
Finally have you lost any coolant at all ?
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Hi took it for a quick drive last night obd was sitting at 86-90 whilst at idle, within 2 miles it was at 110 so drove back home and left it overnight, just checked it now and there was a slight hiss from coolant tank, could this be an airlock because when idling, the hose from the heater matrix to the back of the block goes cold? But if you rev it it starts to warm up.
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