BMW X5 3.0 temp drops with heat on

Asked by boopunn Jan 27, 2019 at 10:15 PM about the 2001 BMW X5 3.0i AWD

Question type: Maintenance & Repair

I have a new water pump, both temp sensors,Thermostat,heat pump assembly
and my X5 idles at operating temp with no heater on. When I turn the heat on
the temp drops below a  1/4 unless im driving down the road. I have verified it is
not just the gauge acting funny with a computer and watching the temp from the
ECM. It should stay at running temp. Thanks

1 Answer

F_O_R answered 5 years ago

The heater takes heat from the cooling system which is normal. If the temp drops too much you may have a faulty thermostat.

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