Interesting.
I've just bought a 1989 ninety that has had a 200 tdi engine from a Disco 1 transplant. All good but the heater is useless even in the small cab of the pick-up.
This one has a heater box where the water hoses are in and out at the top surface slightly protruded. The box looks in good condition with no rot. The hot to cold cable seems to open and close a flap inside the box but I have no idea what it does. I have not come to find a cross section to see the mechanism inside.
Could mine has a clogged matrix preventing water or air flow I have no idea. All I know its bloody cold in the cab when I want warmth.
Any ideas??
