S70 ECC/fan trouble.....

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thijs - 26 Oct 2004 14:40 GMT

Hi there,

S70 TD '99 with ECC. After starting the engine, the AC seems to start and
the blower/fan (what do you call that in English??) starts up for 2 seconds
(may be a bit less powerful than usual) than the fan quits and my
ECC-switches show green/orange lights: failure. Fan won't function anymore.
I DO get some hot or cold air (depending on the temp. setting) but without
the fan it aint much of course. Appparently the AC itself is fine. Dealer
checked it (read out the computer) and says: the blower/heating engine fails
and has to be replaced.

Possibly true, but the strange part is that it DOES start up for a couple of
seconds. Is it possible that something got stuck in the engine, so that it
almost blocks, sucks up too much power and the computer decides to shut the
whole operation down? Any other experiences with this?

Any suggestions appreciated. Thanks in advance,

Thijs
Holland

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OBD - 26 Oct 2004 22:23 GMT

It is likely the cabin temperature sensor is full of dirt
This is causing fault code ECC-414, this code is wrongly labelled on the
Volvo scan tool which describes a problem with the main blower.

Look to the left of the ECC control box you should see a small grill next to
the heated rear screen switch.

Get a light and look inside, you will find it is full of dirt. There is a
small fan in there to draw air over the sensor wire, this cannot turn
because of the dirt and is causing the problem. The small fan only turns
when the main fan does.
Use a vacuum cleaner to clean out the dirt or remove the sensor and clean
it. Do not poke things in there to clean it or you will break the sensor
wire.

> Hi there,
>
[quoted text clipped - 16 lines]
> Thijs
> Holland

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thijs - 27 Oct 2004 16:02 GMT

That sounded great!!! Tried it straight away....it WAS dirty....but cleaning
it didn't change anything....unfortunately.....thanks anyway - this is the
type of know how I'm looking for!

> It is likely the cabin temperature sensor is full of dirt
> This is causing fault code ECC-414, this code is wrongly labelled on the
[quoted text clipped - 41 lines]
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.783 / Virus Database: 529 - Release Date: 25/10/2004

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Mike F - 27 Oct 2004 15:41 GMT

> Hi there,
>
[quoted text clipped - 16 lines]
> Thijs
> Holland

When the system starts, it self checks. If the motor is drawing too
much current for the voltage applied to it, then the control unit
assumes the motor is going bad and shuts it down to save the fan
controller. Chances are you have a bad heater motor, but it could be
the controller as well.

Signature

Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

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