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Interior Heater Fan Speed Control – Manual override

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2003 4.5 S Interior Heater Fan Speed Control – Manual override.

When the exterior temperature is higher than the set interior temperature (which isn’t very often in the UK), the heater fan usually runs flat out with all the associated indication bars illuminated on the centre console display.

My question is, can I manually slow the fan speed down & if so, using what settings. I think I’ve tried all the settings (auto, mono, eco, etc).

When I manually slow the fan down using the fan toggle switch, the associated indication bars drop too but as soon as I release the switch, the fan immediately speeds up again.

I appreciate in auto mode this should happen but I was hoping there would be a semi or fully manual mode too. I cannot see anything that covers this in the owner’s manual.

The thing is that I’m sure when I first had this car a few years back, I had the ability to control the fan speed manually & why would there be a toggle switch to control the fan speed otherwise?

I’ve recently changed both 12V L/A batteries (under seat & in the boot) – has this forced a change / reset maybe?

I can already sense the answers going to be obvious so go gentle on me !

Edited by Dr Pepper
correction of spelling error
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  • Moderators

There is a chance that the electronic fan speed controller is defective, than he automatically switches to full speed. The controller is located in the airstream between the fan and the condenser inside the AC unit.

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  • 2 weeks later...

Check if one of your fan speed switches on the console is sticking. Mine was stuck in the down position and did the opposite of what you described. Quick cleaning and all better... Hope this helps. - Matt



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