colefem

Guys please i need help. My car been giving me coolant warning for some days now, but the engine is not overheating.

the car was parked overnight, this morning i switched on the ignition and the temperature gauge was on red. the engine has not even started yet, car not even moving. help

Silver42

sounds like a failed sending unit to me - a sensor.

tenspeed

The coolant warning is from a sensor at the bottom of the coolant reservoir. Check to see if you actually have coolant.

The temperature gauge is from a sensor in the coolant flow of the engine. It shouldn't be in the red with a cold engine. Audi could have the sensors tied together to give you an early warning of bad things to come.

What year and what engine? Some early 2012 3.0L's had thermostat and water pump problems that were corrected in later models.

DB22

You can see better info of engine temp by viewing the lap timer's oil temp but you don't state any useful information like model, year or location.

raysirx

Typically if you ground the sensor it will max out the gauge, and if you disconnect the wire it will read minimum.
You could have a short to ground.

tenspeed

That short to ground could be a bad sending unit on the engine.

irenesbob

Good advice as the first investigatory step that many may overlook.