97 A6 no heat

sugaryling · 03-05-2012, 05:53 PM

No heat at idle. Very little heat while driving after a long time. I bleed coolant system buy unscrewing the plastic screw at the heater core hose already. The bottom heater core hose feels hot (not super hot), however the top heater core hose isn't warm at all. Is this a sign that the core is bad or clogged?

Prospeeder · 03-05-2012, 06:48 PM

yes its no good, need a new core. you can try to flush it with a garden hose, i have had good look doing that.

sugaryling · 03-05-2012, 07:20 PM

I took a few mins today to mess with the heater core hoses and there's no room to pull them off. Do you have to remove the blower next to the hoses in order to free up some room? How did you remove the hoses to flush it?

alikat · 03-10-2012, 01:08 PM

My dad fixed my car with no heat and it had to do with a little electronic piece (blend door motor) that when he cleaned etc it fixed the problem. On my a6 it is in the engine compartment, at the firewall and he had to take off the wipers etc to get to it. It was on the right side (drivers) on the heater box or something like that. Good luck..

audiqv8 · 03-11-2012, 10:15 AM

Trace the hose from the heater core and remove it at the engine firewall, this will be a lot easiler. Also since you did an earlier flush; did you have heat before the flush? If the answer is yes then you have air in the system.

sugaryling · 03-12-2012, 04:52 AM

No, I didn't have heat before the flush. That's why I flushed it. I was hoping the flush will restore the heat. I was thinking the same thing, to remove the heater core hoses from the engine side.

How do you bleed the coolant system anyway? I only see one bleed hole at the heater core hose (top one at the wall). Is there another bleeder at the front of the engine like the 2.7T engines?

audiqv8 · 03-12-2012, 01:26 PM

Quote:

Originally Posted by sugaryling

No, I didn't have heat before the flush. That's why I flushed it. I was hoping the flush will restore the heat. I was thinking the same thing, to remove the heater core hoses from the engine side.

How do you bleed the coolant system anyway? I only see one bleed hole at the heater core hose (top one at the wall). Is there another bleeder at the front of the engine like the 2.7T engines?

Try the following link

http://forums.quattroworld.com/a6100/msgs/339.phtml

sugaryling · 04-12-2012, 06:27 PM

I did just that. Removed the hoses at the engine side and flushed it. I HAVE HEAT! Too bad I don't need the heat anymore since the weather is warmer. Maybe during cold mornings. I'm sure it's still a little bit clogged because the heat is not as hot as my C5 A6, but it's about 90% there. I'm satisfied. Thanks!

egp320i · 04-12-2012, 09:07 PM

Did you even check the heater valve under the plastic windshield tray? When your heater control is above LO vacuum holds the gate open for coolant to flow, if you have a vacuum leak or the plastic lever broke the door is shut, coolant cannot flow into your core.

sugaryling · 04-13-2012, 11:45 AM

Yup, checked that. I replaced the vac hose a few weeks ago. Anyhow, the heat works 100% now. I guess the flush did the trick. When I'm flushing it, the water isnt coming out at the same rate that it's going in so I'm guess its still a little clogged. I also filled the coolant system with fresh clean coolant. After a short drive, I can see that the coolant has turned a dirty pink color almost slight brown with tiny bits of sediments. It must be coming from the clogged heater core or radiator.

On the other hand...still have over heating and brake issues. That's another post. LOL One thing at a time.

03-05-2012, 06:48 PM	#2
Prospeeder AudiWorld Senior Member Garage is empty, add now Join Date: Aug 2011 Posts: 862	yes its no good, need a new core. you can try to flush it with a garden hose, i have had good look doing that. __________________ 1992 Audi 100 CS Quattro 1991 Audi 200 Turbo 1999 Audi A6 Avant 1998 Audi A4 quattro

03-10-2012, 01:08 PM	#4
alikat Audiworld Junior Member Garage is empty, add now Join Date: Mar 2012 Posts: 22	No heat issue My dad fixed my car with no heat and it had to do with a little electronic piece (blend door motor) that when he cleaned etc it fixed the problem. On my a6 it is in the engine compartment, at the firewall and he had to take off the wipers etc to get to it. It was on the right side (drivers) on the heater box or something like that. Good luck..

04-12-2012, 09:07 PM	#9
egp320i AudiWorld Super User 1994 Audi 90 My Garage Join Date: Jan 2002 Location: E.Idaho Posts: 4,383	Did you even check the heater valve under the plastic windshield tray? When your heater control is above LO vacuum holds the gate open for coolant to flow, if you have a vacuum leak or the plastic lever broke the door is shut, coolant cannot flow into your core. __________________

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03-05-2012, 07:20 PM	#3
sugaryling AudiWorld Member Garage is empty, add now Join Date: Aug 2006 Posts: 557	I took a few mins today to mess with the heater core hoses and there's no room to pull them off. Do you have to remove the blower next to the hoses in order to free up some room? How did you remove the hoses to flush it?

03-11-2012, 10:15 AM	#5
audiqv8 AudiWorld Super User Garage is empty, add now Join Date: Apr 2002 Posts: 3,041	Trace the hose from the heater core and remove it at the engine firewall, this will be a lot easiler. Also since you did an earlier flush; did you have heat before the flush? If the answer is yes then you have air in the system.

03-12-2012, 04:52 AM	#6
sugaryling AudiWorld Member Garage is empty, add now Join Date: Aug 2006 Posts: 557	No, I didn't have heat before the flush. That's why I flushed it. I was hoping the flush will restore the heat. I was thinking the same thing, to remove the heater core hoses from the engine side. How do you bleed the coolant system anyway? I only see one bleed hole at the heater core hose (top one at the wall). Is there another bleeder at the front of the engine like the 2.7T engines?

04-12-2012, 06:27 PM	#8
sugaryling AudiWorld Member Garage is empty, add now Join Date: Aug 2006 Posts: 557	I did just that. Removed the hoses at the engine side and flushed it. I HAVE HEAT! Too bad I don't need the heat anymore since the weather is warmer. Maybe during cold mornings. I'm sure it's still a little bit clogged because the heat is not as hot as my C5 A6, but it's about 90% there. I'm satisfied. Thanks!

04-13-2012, 11:45 AM	#10
sugaryling AudiWorld Member Garage is empty, add now Join Date: Aug 2006 Posts: 557	Yup, checked that. I replaced the vac hose a few weeks ago. Anyhow, the heat works 100% now. I guess the flush did the trick. When I'm flushing it, the water isnt coming out at the same rate that it's going in so I'm guess its still a little clogged. I also filled the coolant system with fresh clean coolant. After a short drive, I can see that the coolant has turned a dirty pink color almost slight brown with tiny bits of sediments. It must be coming from the clogged heater core or radiator. On the other hand...still have over heating and brake issues. That's another post. LOL One thing at a time.