Help help 306

[Causier]

Hi all im having problems with my 306 heater it only works on full number 4 iv swappsd the controls over
To no luck any ideas ???

[Old Merc]

It will be the rheostat,you will find it in the heater air intake.Open bonnet and remove the flexible plastic cover n/side of bulkhead.

[Causier]

Cheers for that im on it this weekend

[StoatInACoat]

It normally is as above, however I had this problem on my diesel for a while which I ignored until the fan completely packed up. Replaced the fan unit with a scrap yard one for £20 and it all worked normally again. Very odd.