Blower failed. Heater unit seized after a few months of erratic behaviour. New Heater Unit fitted. This is haphazard. Sometimes it works. Sometimes it appears to have completely broken down. Dealer's experts cannot seem to manage to use diagnostic equip. Car under warranty.
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First of all, are you sure it is a coolant leak and not the natural draining of the Air Con., a leak on piping to or from the washers, condensation from the exhaust etc.?
Does the coolant level drop significantly and if so, how much and over what period?
Can you collect in a tray the liquid that is leaking? What does it look and smell like and what colour is it?
Does it leak with the air con disconnected?
Does the heater work properly?
When you say that it is leaking 'right under the middle', I presume you mean the middle of the car. If you park over a newspaper, where does the drip end up (which might not necessarily be immediately below the leak)?
The only other thing then would be if the compressor is turning, engaging, and the cooling fan working properly. You should either be able to see the compressor clutch engage, as the switch is energized, or at least hear it click loudly when the switch is energized. If it is not, then there are sensors for the low pressure/high pressure line to tell the compressor when to function, that also have to be checked.
As the engine runs with the compressor turning, one line should be hot/warm, the othe,r (larger diameter hose) should be cool/cold, if the system is working properly.
If the compressor is turning when you have the A/C turned on, then see if the cooling fan is running as well. It must run to remove the heat and cause the process to function properly.
This is probably caused by a power failure to the DDCV ( dual climate control valve) or the valve its self has failed. Another common issue is a broken / corroded cable leading to the DCCV.
You need to check power to the valve as the first step.
A good auto elec will be able to check it out easily for you. If the valve has failed and when replaced it will still not work correctly due to lost power signal - this will be caused by control module, this unit can sometimes be repaired as the valve when it fails burns out the printed circuit tracks in the unit
Hope this helps - good luck.
I had no heat after replacing the water pump on my 96 Audi A6 quattro. After reading the last post, I found a bleeder on one of the hoses going to the heater core. I just turned it and it allowed the air to escape. Then I had heat.