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Audi A4 The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.

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  #1  
Old 11-29-2004, 06:17 PM
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Default Bleeding coolant system

My heater isn't working. David9999 suggested bleeding the coolant system. Um, how do you do that?
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Old 11-29-2004, 06:40 PM
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Default RE: Bleeding coolant system

Did the heater just stop or did you do any work to the car?

Could be the temperature regulator flap motor - Do you have a Vag-Com to check for errors?
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Old 11-29-2004, 06:59 PM
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Default RE: Bleeding coolant system

No, I don't have a VAG COM. I KNOW I need to get one. I don't have a CEL. Could there be codes without a CEL?

About a month ago, I put in a new coolant temp sensor and had to refill the coolant. That's really all the work I've done that would affect coolant. I've never heard of bleeding a coolant system. (You don't have to do that on NORMAL cars) How do you do it?
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Old 11-29-2004, 07:10 PM
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Default RE: Bleeding coolant system

CEL codes usually only relate to the engine or emmissions. You may find all kinds of fault codes without a CEL.

What do you mean you don't have to bleed normal cars?!!!

I didn't have problems with mine when I changed my water pump.


There is a bleed hole on top of the heater hose:
http://forums.audiworld.com/a4/msgs/1694837.phtml
http://forums.audiworld.com/a4/msgs/1472390.phtml
http://forums.audiworld.com/a4/msgs/1694969.phtml

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  #5  
Old 11-30-2004, 02:44 AM
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Default RE: Bleeding coolant system

yah just loosen the hose at the heater core and pull it out till you can see through the little hole in the top run the car with heater on till coolent comes out... on the 1.8T that is on the 2.8 it sugest bleeding it at the pump to...
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Old 12-04-2004, 12:49 AM
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Default RE: Bleeding coolant system

OK, I bled it at the heater coolant hose as suggested. I couldn't see that any air came out though. Coolant came out almost immediatly. It still blows barely warm air. A little cool. Should I let coolant run out the little hose for a while? It seems to me that any air would be the first to come out.
BTW, what coolant do you all use?
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Old 12-04-2004, 12:51 AM
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Default RE: Bleeding coolant system

ONLY use red G12 coolant.
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Old 12-04-2004, 12:57 AM
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Default RE: Bleeding coolant system

OK, now any ideas about the heater?
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Old 12-04-2004, 01:25 AM
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Default RE: Bleeding coolant system

All I can think is a clogged/bum heater core.

There are 2 rubber pipes running from the engine bay into the cabin (attach to the "nipples" of the heater core), to the driver's side of the battery. Clamp the one on the driver's side so that your coolant doesn't go everywhere. Take an air hose , and while covering the outlet to the heater core, blow it out. If the air flows through, it's not clogged.

How are your engine temperatures after the car is warmed up?
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  #10  
Old 12-04-2004, 01:27 AM
 
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Default RE: Bleeding coolant system

i hate the red coolant i bet you could use any coolant you wanted and it would work fine
Old 12-04-2004, 01:27 AM
 
 
 
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18, 18t, 2003, a4, air, audi, b6, bleed, bleeding, coolant, coolent, cooling, system, tt, vw


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