Question about 1985 Mercedes-Benz 190

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Heater only works when car is parked - 1985 Mercedes-Benz 190

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Hi,the heating is also controled by the firmastate which could be the falt,it contols the engine tempriture when you have the heating on the fermastate will close a bit so that when the heat is drown away for your heating the engine stays at its optimal running tempriture,so if the fermastate is stuck open when the car is in motion it will also have the radiater cooling the car down so the heating will get cooler,but when the car is at a stand still the heating will work as the car is not getting eney cooling from the radiater,there are tests to check the ferastate but if you take it out you might as well replace it. Hope this was some help.

Posted on Dec 12, 2014

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