Heater blower problems

vag80 · 30-10-16, 11:41 AM

Hi does anyone know where I can get a wiring diagram for the heater blower system for a b3 80, as my blower fan is only working on speed 1&2 and nothing at all on 3&4 if anyone has any idea what's wrong that would I would be grateful cheers

Ben · 30-10-16, 12:56 PM

This is for the AC but the fan wiring should be mostly the same:

4v6 · 30-10-16, 02:43 PM

If the fans working on a couple of speeds but not the others thats usually a sign of a blown heater motor rheostat, shouldnt be huge money and a second hand unit will more than likely fix it,

vag80 · 30-10-16, 03:43 PM

4v6 are you on about the resistor on top of the blower motor housing

cjp0349 · 30-10-16, 05:48 PM

Quote:

Originally Posted by 4v6

If the fans working on a couple of speeds but not the others thats usually a sign of a blown heater motor rheostat, shouldnt be huge money and a second hand unit will more than likely fix it,

Quote:

Originally Posted by vag80

4v6 are you on about the resistor on top of the blower motor housing

'Heater motor rheostat' also known as THE SWITCH

4v6 · 31-10-16, 02:19 PM

Quote:

Originally Posted by cjp0349

'Heater motor rheostat' also known as THE SWITCH

I think youre right!

Cynical26 · 05-01-17, 11:40 PM

Quote:

Originally Posted by vag80

4v6 are you on about the resistor on top of the blower motor housing

I only had a blower on speed 4. Replaced the heating resistor on top of the blower, pain in the arse but quick, and hey presto: all 4 speeds work again!

Tun · 06-01-17, 07:59 AM

I had same problem on my 90, resistor on blower motor was the culprit. Hides behind the glove box. Find and press locking tab and twist/turn the motor and lift it out to get access
This is the part from memory.

http://www.ebay.co.uk/itm/NEW-Audi-8...wAAOSws65TrFVk

30-10-16, 12:56 PM	#2
Ben 4 ring whore! Classic Audi Club Member Join Date: Mar 2008 Location: Stockport Posts: 2,348	This is for the AC but the fan wiring should be mostly the same: __________________ 1992 80 quattro 20vt

30-10-16, 03:43 PM	#4
vag80 Senior Member Classic Audi Club Member Join Date: Oct 2008 Location: Bracknell Posts: 1,967	4v6 are you on about the resistor on top of the blower motor housing __________________ nothing like a bit of deep dish 200k club member 87-b3 80 83-4000 2 door

06-01-17, 07:59 AM	#8
Tun Grown up member Classic Audi Club Member Join Date: May 2011 Location: Buxton Posts: 745	I had same problem on my 90, resistor on blower motor was the culprit. Hides behind the glove box. Find and press locking tab and twist/turn the motor and lift it out to get access This is the part from memory. http://www.ebay.co.uk/itm/NEW-Audi-8...wAAOSws65TrFVk __________________ 1988 MB quattro 2012 S4 Avant

30-10-16, 02:43 PM	#3
4v6 Ex Member Classic Audi Club Member Join Date: Dec 2007 Posts: 5,565	If the fans working on a couple of speeds but not the others thats usually a sign of a blown heater motor rheostat, shouldnt be huge money and a second hand unit will more than likely fix it,