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GCDG60

heater matrix bypass valve

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got no hot air,its not the matrix but ive been told its this valve, anyone got?? vw say they are obselete

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The valve was a retro-fit as when the coolant got too hot, the matrix failed in some VW's.

 

Try fitting the substitute pipe inlet side with a restricted diameter to slow flow down, so the matrix effective temperature remains cooler if you go the simple way. THe valve would normally do this and vary according to temperature. Well placed dent in the side wall of the pipe.

 

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