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  #1  
Old 02-01-2017, 12:10 PM
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Tap, tap, tap when the fan is on!

Hi there,

I've got a persistent tapping sound when my fan is on. Not the aircon, just the blower.
The tap is very uniform and steady, and stops as soon as I kill the blower. From the driver's seat, it's coming from somewhere over on the passenger side, quite low down, and sounds almost like it's under the footwell.
This morning, I left the engine idling and went around to the outside of the car, and it was clearly audible from outside too - low down around the front passenger door area.

Any ideas what could be causing this? I know there's an auxiliary heater housed somewhere, but no idea if this could be the culprit or not. The problem persists even when the engine is fully up to temperature and so the aux heater shouldn't be required.

Thanks
Andy
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  #2  
Old 02-01-2017, 12:32 PM
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Probably the blower motor bushing going bad. Mine squeaks very quietly when cold but goes away after 5 mins of drive time never to be heard from again until morning.
Solutions: Ignore or pull and relube bushing (?!)
End Results: It will get worse then die.

Recommendation: lay on passenger floor to pin point location. Attempt to pull blower motor and inspect for interference or slack in parts sounding it. I have no experience in this area on an X5. Most are a PITA.
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Old 02-01-2017, 01:08 PM
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could be something got suck into the blower motor and is now hitting the fan as the fan turns.
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Old 02-01-2017, 07:19 PM
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Its the auxiliary heater making a ticking noise when on in cold weather to aid heating interior, when you turn the fan off it is not required so stops.
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Old 02-01-2017, 08:13 PM
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Quote:
Originally Posted by bmwfanx5 View Post
Its the auxiliary heater making a ticking noise when on in cold weather to aid heating interior, when you turn the fan off it is not required so stops.
The aux. heater runs if you start the car at an ambient temp of less than 6DegC. (i.e. 5.5DegC. or lower) and heats the engine coolant until the engine coolant reaches 75DegC. - it then shuts off. It uses the aux. water pump to distribute warm water to the engine. It is not coupled to the blower motor on or off status directly but if you shut down the blower completely and that shuts off the IHKA unit entirely, that might kill the aux. heater. I never turn my IHKA off so I'm not sure.

I wouldn't test this too much either. Once the aux heater starts, it's a good idea to let it run at least 3 or 4 minutes and get up to operating temp. Short runs and frequent on/off cycling will lead to a fouled Webasto (aux. heater unit) that can be hard to repair

I have the "Telestart" remote (a copy actually) and can start the aux. heater manually. In this case (engine not running) the IHKA will monitor the coolant temp and when it gets to about 30DegC. the IHKA will start the blower motor, set the vents to "screen" and start to warm the screen and cabin.

BTW, the aux. heater doesn't make a ticking sound - it's the fuel dosage pump feeding the aux. heater that makes a ticking sound - the aux. heater sounds like a small jet engine and doesn't actually tick itself.

If it's a foreign object hitting the blower fan blades, the ticking sound will change rate with fan/blower speed changes.
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