1999 A4 Temperature Gauge Reading -49 Please Help

[dmollo]

I have a 1999 Audi A4 2.8. The temp gauge is reading -49 or so and the AC won't turn on. Is there a problem with the external temperature sensor? If so, where is it located? Thanks for your help.

[I_am_stealth]

It is probably located at the very front of your car. Which temperature gauge shows -49? Engine temperature, or air temperature?

[Richiec]

Hi

I have the same problem, did you find out where the sensor is?

Thanks

Richie C

[I_am_stealth]

I believe it is right in front of the radiator if it is the air temperature sensor for AC.

[Richiec]

Hi

yes the air temperature sensor

Thanks

[evilscotsman]

I had this, and i found the battery voltage was poor anyway while checking it so replaced the battery with a new one, and suddenly the temp reading was correct. I used to get -52 to +3 (summer) etc etc just random rubbish. Dont know if just disconnecting the battery for 10 minutes would do the same (remember radio code) as its maybe a software glitch and just needs an ecu reset (by removing NEG battery lead for 10 mins)

Worth a try...