Heater loses temperatures at speed

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R1cardo
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Post Wed Feb 08, 2023 6:26 pm

Heats up fine but loses warmth when you get up o to speed, so above 50ish. Any suggestions?
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BenHar
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Post Wed Feb 08, 2023 6:34 pm

Thermostat.

Ben
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R1cardo
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Post Wed Feb 08, 2023 9:47 pm

Thermostats has been replaced
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ChrisHC
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Post Fri Feb 10, 2023 5:02 pm

Perhaps the water pump, which is a bit of a weakness on the 6 sylinder cars in my experience.
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flybynite
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Post Fri Feb 10, 2023 6:41 pm

R1cardo wrote: ↑
Wed Feb 08, 2023 6:26 pm
 Heats up fine but loses warmth when you get up o to speed, so above 50ish. Any suggestions?
What engine?

First thoughts for me, especially if things have been replaced is bleeding? Have you bled the system properly? Nose high, heater set to hot etc etc?
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R1cardo
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Post Sun Feb 12, 2023 8:55 am

325i. Thermostat was done at a garage, so presumably was bled correctly.
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flybynite
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Post Sun Feb 12, 2023 10:04 am

R1cardo wrote: ↑
Sun Feb 12, 2023 8:55 am
 325i. Thermostat was done at a garage, so presumably was bled correctly.
E30 M20s can be a pig to bleed correctly so unless they have experience of E30s then I wouldn't assume anything.
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