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Temp gauge dropping when heaters on

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crookedd:
I had the same issue years ago. Also car never reaching 90 degrees fully in winter or dropping from 90 when constant highway speeds. Issue was thermostat.

Mk5gti:
So my issue is the needle drops when I turn heaters on
Both thermostats have been done and temp sensors using genuine parts, while driving the needle doesn’t drop, the needle will only drop at idle with heaters on

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