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-   -   Heater Problem A4 (http://www.autobanter.com/showthread.php?t=55044)

Ronny January 25th 06 08:29 AM

Heater Problem A4
 
Wondered if anyone can identify this problem, before I take it to the
dealer.

I have a A4 B6 1.8T Q and for some reason the blower will not work when the
temp is below 8c, as soon as the temp goes above 8c it works fine lol.

This is a well strange problem, the heat blows out fine under its own steam
on the motorway when its like -2c but the fans will not come on, the water
temp is perfect at 90c and the header tank is at the correct level.

The interior climate control shows full speed on the fan blower but they do
not come on, is there some sort of sensor within the car that senses a temp
somewhere and tells the blowers to come on/off

Another weird thing, in the summer or at any temp where the blowers work,
when you put the wipers on, the blower speeds up for a few secs and then
goes back to normal, it's as if the sensor on the dash gets momentarily
confused by the wiper sweep and speeds up the fans.

Anyone any ideas before it goes into the dealers?

Cheers



Tony January 25th 06 06:34 PM

Heater Problem A4
 
The climate control is set up to not allow the AC to turn on if the outside temp
is 8C (or very close to that). It is not supposed to affect the fan.

There is another system that will not allow the fans to turn on until the engine
coolant temp reaches a certain level so that the heater doesn't blow cold air.

It sounds like either the wiring for these two systems is incorrect or that the
programing in the climate control is bad. Either way the dealer is the best
place to sort this out especially if you are still under warranty.

Ronny wrote:
> Wondered if anyone can identify this problem, before I take it to the
> dealer.
>
> I have a A4 B6 1.8T Q and for some reason the blower will not work when the
> temp is below 8c, as soon as the temp goes above 8c it works fine lol.
>
> This is a well strange problem, the heat blows out fine under its own steam
> on the motorway when its like -2c but the fans will not come on, the water
> temp is perfect at 90c and the header tank is at the correct level.
>
> The interior climate control shows full speed on the fan blower but they do
> not come on, is there some sort of sensor within the car that senses a temp
> somewhere and tells the blowers to come on/off
>
> Another weird thing, in the summer or at any temp where the blowers work,
> when you put the wipers on, the blower speeds up for a few secs and then
> goes back to normal, it's as if the sensor on the dash gets momentarily
> confused by the wiper sweep and speeds up the fans.
>
> Anyone any ideas before it goes into the dealers?
>
> Cheers
>
>


Ronny January 25th 06 07:06 PM

Heater Problem A4
 

"Tony" > wrote in message
...
> The climate control is set up to not allow the AC to turn on if the
> outside temp is 8C (or very close to that). It is not supposed to affect
> the fan.
>
> There is another system that will not allow the fans to turn on until the
> engine coolant temp reaches a certain level so that the heater doesn't
> blow cold air.
>
> It sounds like either the wiring for these two systems is incorrect or
> that the programing in the climate control is bad. Either way the dealer
> is the best place to sort this out especially if you are still under
> warranty.
>


Cheers tony, do you think a wire may have just come off? and if so where
abouts.

Its only happened recently



Tony January 25th 06 09:24 PM

Heater Problem A4
 
It might be related to a faulty ground but I would not be able to guess where
that might be.

Ronny wrote:

> "Tony" > wrote in message
> ...
>
>>The climate control is set up to not allow the AC to turn on if the
>>outside temp is 8C (or very close to that). It is not supposed to affect
>>the fan.
>>
>>There is another system that will not allow the fans to turn on until the
>>engine coolant temp reaches a certain level so that the heater doesn't
>>blow cold air.
>>
>>It sounds like either the wiring for these two systems is incorrect or
>>that the programing in the climate control is bad. Either way the dealer
>>is the best place to sort this out especially if you are still under
>>warranty.
>>

>
>
> Cheers tony, do you think a wire may have just come off? and if so where
> abouts.
>
> Its only happened recently
>
>


Pete January 25th 06 09:49 PM

Heater Problem A4
 

"Ronny" wrote
> Anyone any ideas before it goes into the dealers?


Any fault codes stored in the ECU? I'm guessing you would have told us if
there were, or if you had access to a VAG-COM tool, though. :)

Pete



Ronny January 25th 06 10:13 PM

Heater Problem A4
 

"Pete" > wrote in message
...
>
> "Ronny" wrote
>> Anyone any ideas before it goes into the dealers?

>
> Any fault codes stored in the ECU? I'm guessing you would have told us if
> there were, or if you had access to a VAG-COM tool, though. :)
>
> Pete
>
>


No fault codes, nothing :(

I got VAG-COM




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