Interesting heating problem
02-15-2018, 07:40 AM
#1
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Interesting heating problem
Hey all. Have a heating problem. When the engines temperature is 90 c on idle rmp heater blows cold air. On high rmp blows hot air. But the thing is then the ignition is on and engine off heater blows hot air after starting engine heater blows cold and get foult code 00739 - Coolant recirculation pump Upper limit exceeded. Already changed water pump, flushed heating system. Any solution? 3.0 tdi
Last edited by Audi a6 owner; 02-15-2018 at 07:59 AM.
02-15-2018, 11:00 PM
#2
AudiWorld Super User
Have you changed the heater control valve, which is located in the plenum ? The solenoids in this part can stick that can affect the air temp in the cabin.
02-16-2018, 08:56 PM
#4
AudiWorld Super User
The fault code you ID (00739) doesn't show up in the Bentley Repair Manual. If it was a SAE DTC, it would have "P" prefix with four digits. If a VAG DTC, it would be a five digit number. What scanner, e.g. VCDS, are you using to detect the DTC?
02-16-2018, 09:50 PM
#6
AudiWorld Super User
That scanner would appear to be a generic OBD-II scanner, which may not correctly display the codes in SAE or VAG format. Without either the SAE P code of the VAG code, there is way to find the repair procedure in the A6 C6 Bentley Repair Manual.
