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Heater problem / Radiator Flush

After an overheating problem my heater is now not getting hot, it appears to be an air lock. Ive tried very hard to bleed it but without success. Thinking the heater was blocked, ive removed the inlet and outlet pipes and blown a hpsepipe both ways into the heater and it passes clear water.

 

Has anyone got any suggestions to where else there is a blockage? The temp guage reads normal, but the engine is getting very hot.

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    Thermosat stuck shut, will also make bleeding air out to make heater work almost impossible.

     

     

    Jeff TT

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