diagnosis of knocking under dashboard

Apr 09, 2007 4 Replies
M

Hi



Just paying a quick visit to this newsgroup, prior to taking the car to the garage.



It's a renault megane, about 5 years old, and when turning on the electrics (ie before even turning on the engine) there's a knocking/straining noise coming from under the dashboard towards the base of the window.



It -sounds- like a motor of some kind is straining to do something. After a few moments it stops and everything is (or appears to be) aok. It's been doing it for a few weeks now, and isn't getting worse.



On this sketchy info, any suggestions as what it is that might be wrong?


Maurice


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L

In message , Maurice W writes

Dodgy ventilation fan motor? Try changing the fan speed and see if this affects the noise

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M

Just a wild guess. Some sort of servo valve in the heater circuit? Mike.

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P

There is a known fault on Renaults, the motor driving the heating flap goes internaly wrong, continually driving the flap round and round with a steady thumping noise. Only cure is a replacement unit.

Rdgs

PDH

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M

Well, that's what I'm going to suggest to the mechanic when I take it in to the garage, in the hope of not appearing to know f*** all about cars! (When people ask me what kind of car I've got, I tend to reply 'a green one' which gives them an indication that I'm not going to be able to contribute much to an auto discussion!)

Thanks :-)

M
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