Was the 300TDi a Defender 110. If yes do you know what the heater control wire does when you turn the heater knob down and it
twists something on top of the heater box only I am not getting any heat in the cab area. The blower is working OK.
I know it has a matrix inside the box which the 2 water pipes, which do get hot, fit onto but is the bit which twists on top of the heater
box opening or closing a vent of sorts to let the warm air into the cab.
 
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