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Why doesn't the heater work on my camper van?

I have petrol 1990 Nissan vanette camper. The heater blows but no heat, any ideas?

Asked on 18 February 2014 by edarren123

Answered by Honest John
There must be a blockage between the engine and the heater matrix, or the heater valve has failed so no coolant is getting through from the engine to the heater matrix.

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