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Old 01-16-2008, 06:10 AM   #1
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Default Audi A4 Heat Problem...NEED HELP ASAP!

Hello,

I need some help with my 99 A4 Quattro. Ok, I recently got my coolant flushed many times over again but I am still not getting HOT HOT heat....just warm at times. It seems that the Thermostat is working fine but fluctuates at times. Any idea what this could be? PLEASE HELP!

**The heat is set @ "HI" at all times but does not blow warm at all unless on the freeway....then a little warmer.
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Old 01-16-2008, 06:18 AM   #2
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Default Bleed the system where the heater hose meets the heater core.

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Old 01-16-2008, 06:20 AM   #3
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Default your waterpump could be on its way out... whether that means

a broken impeller blade, or a completely failed pump im not sure.

Also you could throw your thermostat into water and see what temp you have to bring it up to in order to get it to open up. Might be the wrong tstat
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Old 01-16-2008, 06:22 AM   #4
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Default Had the same thing after blowing a coolant hose

Just keep the heat up on high and drive up steeeeeep hills. just make sure you stop often tto top off. Took me a bit of time till i got all the air out and the core filled again.
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Old 01-16-2008, 06:29 AM   #5
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Default Re: Had the same thing after blowing a coolant hose

So, all I have to do is drive up a steep hill and stop often? How steep and for how long? Any other alternative?
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Old 01-16-2008, 06:43 AM   #6
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Default Re: Bleed the system where the heater hose meets the heater core.

Is this the hose next to the battery?
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Old 01-16-2008, 07:09 AM   #7
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Default Yup.

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Old 01-16-2008, 11:19 AM   #8
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Default I have done the same and cant get hot heat.

What does your temp gauge read? mine reads cold all the time until it sits and idles for a bit. but then it only gets not even half way up.
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Old 01-19-2008, 08:39 PM   #9
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Default Backflush and Burp the heater core

There's writeups on the FAQ
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Old 01-24-2008, 02:11 PM   #10
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Default Re: Backflush and Burp the heater core

I absolutely agree with the backflush and bleeding the air in the heater core.

Couple of years ago, I had similar issues. The overflow tank looked brownish so there had to be some rust or gunk in the coolant system.
I took the two hoses off at the connection to the heater core near the firewall (between the battery and the brake vacuum booster. Just simply used a garden hose with a spray head (set it to "jet" or "stream") and then flushed the heater core. Be careful as the water may come back to hit you in the face or eyes. Spray water from the outlet hose(closest to the battery; one with a bleeder hole) and saw the rusty gunk come out of the inlet hose (closest to the brake vacuum booster).

Then check the flow by spraying the water from the inlet hose to make sure water was coming out clear. Refill with extra 50/50 coolant/water mixture in the overflow tank and check for correct level.

Have not had problem with heat in the car since.
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Old 01-24-2008, 02:11 PM
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1997, 2000, 2001, a4, audi, bleed, burp, burping, coolant, heat, heating, problem, problems, s4, tt


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