Heater Fan / Aircon Problem

[sasquartch]

I've done a search but can't find the exact problem.

 

I have a 2005 TDi with manual aircon (ie NOT Climatronic)

 

The heater fan does not work at all on pos 1 and 2, but appears fine on pos 3 and 4.

 

The strange thing is that if I set the fan to postion 1 or 2 and turn the heater control to the defrost position the front heated screen demister comes on (as expected) and also the aircon comes on (as expected), As mentioned, the fan doesnt come on. BUT when I turn the fan up to pos 3 or 4 the fan starts but the aircon goes off and cannot be turned on until the fan is turned down to 1 or 2.

 

I'm reasonably I can hear the aircon compressor comes on when the aircon light is on.

 

Would this be caused by the resistor ? I can't find any reference to this causing the aircon to go off when the fan comes on.

 

It has never been a problem before (I've owned the car from new)

 

Has anyone got any ideas ?

 

Would anything likely show up with vag.com ?

 

All and any input welcomed :-)

[chrispb123456]

Resistor pack is on the heater unit behind the glove box, you will need to remove this to access the resistor.

See link below member with similar problem.

 

http://www.fordgalaxy.org.uk/ford/index.php?/topic/23024-front-heater-blower-stopped-working-on-positions-1-and-2/page__pid__167487&do=findComment&comment=167487

[sasquartch]

Many thanks, that's the exact problem I'm seeing.

 

I'll go and remove it now and get a replacement - I'll report back with the outcome :-)

[sasquartch]

Bought a resistor pack (second hand) on ebay.

Arrived today and checked it with a ohmmeter - there is resistance between pins 1,2 and 4 but nothing to pin 3

Tried it anyway and it doesnt work (as expected), slightly different fault as aircon only comes on on position 1 and the fan only runs on pos 3 and 4. So I've just put the original one back in and will have to get a refund on the one I've just bought.

 

Can anyone confirm that all 4 pins should buzz out ?

 

I'm probably just going to bite the bullet and buy a new one from Ford - or am I better off going to VW ?

[sasquartch]

Just managed to find my TIS disk. Studied the wiring diagrams and it seems there definitely should be resistance between all pins

 

If anyone has a good resistor for sale please let me know :-)