This could be just a bad airlock due to poor coolant refilling. Drain it and refill properly and it just might cure it.
This is from an earlier post:
'Take pipe of bottom of radiator(left hand side) you will probably need pipe grips, I replaced that clip with an eclipse. Undo drain plug on engine block. When all has drained, refit engine block drain plug (bolt) smear red hermatite on the back of the bolt washer.
Replace bottom pipe on radiator. Open bleeder on top of pipe near battery box and fill slowly until water comes from bleeder with no air bubbles. Then squeeze the lower pipe on rad a few times to get rid of any possible air, and do the same to the rest of the water pipes you can see. Top up until water comes out of bleeder as before and tighten. Check level in header tank is up to max. Job done apart from taking it for a ride round until it is at running temp, than check water level.'
JCW
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