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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?
  #2  
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
  #11  
Old 12-04-2004, 01:29 AM
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Default RE: Bleeding coolant system

Only G12 is approved for our system. Do you really want to find out if it works fine or not?
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  #12  
Old 12-04-2004, 08:22 AM
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Default RE: Bleeding coolant system

the new prestone works fine in it... the stuff thats good for any make... Of course if your car blows up its not my fault, I use it...
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Old 12-04-2004, 08:49 AM
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Default RE: Bleeding coolant system

Thanks Jest. I'll try that. The gauge reads engine temp is normal even when warmed up.

Red coolant? green coolant? Well, I have BROWN coolant. Time for a flush. Where is the best place to drain the fluid? Is there a brand of flush that is best?
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Old 12-04-2004, 09:00 AM
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Default RE: Bleeding coolant system

deffinately time to flush... I dont have a preference they the same basicaly folloe the directions and make sure you get it all out ..
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Old 12-04-2004, 11:21 AM
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Default RE: Bleeding coolant system

Open up the coolant expansion tank. then open up the valve on the bottom right side of the radiator (red twist valve I think). Make sure your pan is large enough to hold 2 gallons of coolant. If you like you can flush the system with a garden hose. Just feed water for a few minutes into the coolent expansion tank. Then flush the system out with a gallon or two of distilled water. Close the valve and fill the system with one gallon pentosin G12 and one gallon distilled water (deionized preferably).

Do not mix coolant types, and you really should only use red Pentosin G12 (from audi or bmw). The other brands may work but the audi cooling system isn't designed to work with them.
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Old 12-04-2004, 04:13 PM
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Default RE: Bleeding coolant system

I just bought some flushing solution and green Prestone. Prestone seems to be very opionated about every car manufacturer coming out with their own coolant. The fact is, they all need to do the same thing. Good heat transfer, reduce corosion and low freezing point. Physics is physics. The Germans don't have their own perodic table.
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Old 12-04-2004, 04:27 PM
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Default RE: Bleeding coolant system

You do know that the components in german cars are not made the same as American cars and therefor can be damaged by using green coolant? If your theory was true then why can't you put regular power steering fluid in? Because it will eat through the seals and destroy your steering rack/pump over time. Same thing goes for using green fluid. They don't color code them for the hell of of it.

Click the image to open in full size.
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  #18  
Old 12-04-2004, 05:49 PM
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Default RE: Bleeding coolant system

Gregp, Green stuff is not compatable with the aluminum parts and the interior of the system will corrode. Antifreeze consists of more than ethylene glycol and water. If you think you have problems now, wait until you use green stuff in there.

Anyway, back to original issue. I'm not sure how you ended up with brown coolant after 1 month. You said that you filled it with coolant a month ago and now you have brown coolant. One thing that will cause brown coolant is mixing the red and green stuff.
What did you use a month ago?


Drain and flush the system, then put in the correct fluids.

By the way, we never did find out if, when the engine is warm and the heat is on maximum, whether both lines to the heater core are hot. If neither is hot, this sounds like either a blocked valve, or a plugged core.

If they are both nice and hot, the problem is unlikely to be the coolant or core, but rather the valve that directs the air over the heater core.
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Old 12-04-2004, 05:53 PM
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Default RE: Bleeding coolant system

Which is where a VAG-Com would come in handy, to check if the flap motor is operating correctly.
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  #20  
Old 12-04-2004, 08:16 PM
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Default RE: Bleeding coolant system

I've been reading up on this subject. This Prestone stuff contains nothing that can damage seals or aluminum. Not even German aluminum.

I'm now convinced that, unlike the power steering fluid issue, this falls into the category of the dealer insisting on paying $650 for an ignition control module instead of $150 for an after market one. I'll let you know if my car explodes. (I'm not worried)
Old 12-04-2004, 08:16 PM
 
 
 
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