My Audi 2005.5 A4 2.0T has an issue that I am trying to figure out. When I first start the car the idle is normal, however, when the car heats up the idle will go up and down. Like I am applying the gas pedal lightly and then removing my foot. I have also noticed that after a good 30 minute drive that the temp gauge does not get past 1/4. The heat is blowing out constant hot air so it does not seem like it would be a thermostat. I am thinking that this is related to the Coolant Temperature Sensor. Any ideas?
Could be the faulty sensor is allowing the idle to rise at it thinks the engine is cold ? but again with so many of these questions i do not have a answer without a good look myself as modern day cars have so many variables unlike the old things i used to work on
SOURCE: 1996 Oldsmobile Ciera Temp gauge issue
you either have a intake leak or head gasket. get a pressure test and then youll find the leak......like i did. $800 later. and start looking for another car......
SOURCE: recent coolant problem. replaced thermostat
a compression test will tell you if your head gasket is gone.as far as the jumping gauge readings.just means you have air in the system.if no visible leaks are present it is either a cracked head or head gasket.
SOURCE: 2005 sebring 2.7 V6 Coolant boiling out. Temp
I HAVE A 2001 CHRYSLER CONCORD AND THE OVERFLOW IS BOILING BUT THE TEMP GAUGE IS NOT SHOWING RUNNING HOT. DO YOU THINK THAT THE TERMOSTAT IS STUCK
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