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No demist after fitting new heater matrix

After fitting a new heater matrix the car seemed fine the other night.Last night needed to clear winscreen but nothing ! Get heat from front vent/foot vents but not for windscreen ! Any ideas anybody.

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    I didnt disconnect the ecu,only the amplifier box and have checked these plugs.

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    amplifier = ecu.

     

    One of the sensors may be unplugged still that connects into the ducting in drivers footwell.

     

    Did you remove entire dash to do the matrix, or just did it from drivers footwell ?

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    Thx Legarth,Ahhh,called amplifier in manual,yes had the dash out,was carefull to connect sensors and relocate them,maybe i jammed the levers on replacement of air box but was carefull.Would there be a grounding wire that i may have missed.

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