Heater control valve

Originally Posted by mattie007

Best get that sorted then. Could this be linked to a noise I get on fan settings 1 and 2? Kind of like a loud rumbling?

Valve wouldn't affect that I don't think - sounds like your blower is on way out or something stuck in it. Try dropping it out (couple of screws) and feel how it rotates - should be free and smooth. If not it could be worth trying a spray of WD40 or similar between fan and motor. Can sometimes restore smooth running.