is the temp gauge working, i.e. is the engine temp working correctly? after that, isnt it the heater matrix at fault?
heater matrix is where the hot air comes through, its like a little radiator, a fan blows air through it, like a rad the matrix is hot so the air is heated. just check for things like coolant usage higher than normal, wet carpet from leaks etc, if all that is ok, matrix is probably ok too...
air lock in the heater?
air lock in the heater?
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