Hi, I have a Hymer 544 Integral of 1994 vintage but believe based on 1993 Ducato (the square type) and have a couple of problems with the heater fan. When switched on it is terribly noisy, a sort of dry, squealing sound and also the heater motor only starts at the end of the switch movement (rheostat?) so full on all the time.
I would appreciate help in rectifying both niggles, thanks in anticipation.