Question about Audi A4

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Heater blower runs on all settings but only gets warm when i am at speed when slowing down it goes cold straight away

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The heater core is blocked ,now what you do here is take off the two feed pipes ,use a couple of pairs of mole grips to seal them so you do not loose your antifreeze then flush the heater core with the garden hose on full ,yes i know its wet job if your not carefull but make sure you reverse the flow at least enough times till water runs clear and if you have a or can borrow a power washer use that even better ,you will see lots of brown muck coming out every time you reverse the flow .Now if this doesnt work all that well use a funnel with a pipe on one side and a length of pipe on the other thats hight than the funnel and then fill with a caustic solution and leave for a few hours then flush it all out this will work as i do it quite often .

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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If you have no speeds at all then I would suspect the blower motor is at fault (especially the thunk noise). If the blower resistor went you usually just don't have speed #1 and #2, but will have high speed. There is a slim chance the connector is at fault, but most likely the motor failed. It is located on the right side under the glove box. You will have to remove the right side kick panel, its a few screws holding it in (7mm socket needed). Then the blower motor will have 2 wires check for power and ground (purple 12V black ground). If you have power there on all speeds then the motor is no good. There are 5 bolts connecting the motor to the heater case (usually 5.5mm or 7/32nds socket needed). Pull straight down and replace. Good luck I've been to Winterpeg, stay warm.

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Heater problem


The blower motor resistor is faulty.

On high speed, battery voltage is directed right to the motor.
For any other speeds, battery voltage runs through the resistor pack (in any of 3-4 ways) to reduce voltage and slow the motor down.

The resistor is located (screwed in) inside the heater duct or box somewhere where cold air always contacts it (before the heater core) because it becomes hot and would melt if it wouldn't be constantly air cooled.

You can consult this link http://www.automotiveforums.com/vbulletin/showthread.php?t=665246

for replacement of the resistor (the thread says Grand Am, but your Alero has the same setup)

Thanks for using FixYa!

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