The A/C had been working fine, cooling appropriately at all settings. Last Monday, it started out in econ mode and has, in every recent outside temperature (early morning cool, midday hot, evening cool) lights up and stays in econ mode. I can't turn off econ - fan works, head unit reacts to output - except for the econ button. Help?
SOURCE: 2003 Audi A4 Cabriolet ...cooling fans come on at start up
Yes this car should have a temperature sending unit that tells the fans to kick on. If it has two fans one of them is for you Air-condiontion, and it will turn on whenever the ac is being ran. One other possibility is if you bought the audi used the owner before you may have hard wired the fan to run whenever the car ignition is turned on. The only reason someone would do that is if they were to lazy to fix it properly.
SOURCE: Audi A3 2002 model auto - temperature gauge not working
The guage and fan speeds work on independant sensors. If you can remove the plastic engine cover and locate the "sending unit" for the gauge disconnect it and restart the engine. The gauge should remain cold and not move. If this is the case replace the sending unit. This should be a single wire sender located in the waterjacket of the intake manifold look in the area where the upper rad hose enters the intake.
SOURCE: 2003 Audi TT Quatro Coupe.
The main reason for the over heating of the audi tt is to do with the water pump. The propeller within the first type of water pumps is made of plastic. This was to prevent corrosion, however was never designed to last longer than 5 years. What you need to do is purchase the new style water pump. These new style water pumps have been designed with a metallic propellor which should resolve the overheating. Let us know how you get on.
SOURCE: Turn signals not working audi a6 2002
turn signal switch most likely. But it could have a faulty flasher relay. the signals and the hazards probably have seperate flasher relays and possibly on different circuits so check fuses as well
SOURCE: coolent system fault symbol Audi A6
1998 Audi A6 2.8
It could be that the thermostat is stuck in the open position thus providing maximum coolant flow through the engine when the engine is still cold, ie from a cold start. (The thermo should close when the engine is stopped and cold and it opens up once the coolant temp increases and the engine has been running for a few minutes.) Once the engine is hot maximum coolant flow between engine and radiator is normal.
Do you also find that your heater takes a while to provide warm air to the cabin in winter when you notice this condition?
If you do not know when the thermostat was last changed then I would suggest you change it. ( If it malfunctions and sticks in the closed position you will really have a problem). The radiator/engine coolant could no doubt do with a flush and change in any event as it should be done every 2 years. If you don't know when it was last done - do it. Cooling systems tend to be a neglected part of essential vehicle maintenance.
Cheers
Sean
Voluntary contributor.
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