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Coolant flowing when heating on; not when off

Trojan · 2017-06-26 22:12:34

I have an issue with the E39 - as usual it's with the cooling system. I'm seeing coolant circulating - a strong flow into overflow bottle - when the heating is on high in the car. When I turn off the heat I'm seeing no coolant circulating at all. What are the typical causes of this?

26-06-2017 10:12pm

#1

Trojan

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I have an issue with the E39 - as usual it's with the cooling system.

I'm seeing coolant circulating - a strong flow into overflow bottle - when the heating is on high in the car. When I turn off the heat I'm seeing no coolant circulating at all.

What are the typical causes of this?

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Comments

#2 27-06-2017 2:10pm

ironclaw

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I'd assume its a thermo switch, only kicking in when needed (prolong pump life) or when it knows its going to be needed (High heat)?

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