The 2008 Dodge Avenger coolant temperature sensor is at the back of the head on the left half of the motor. This sensor is to ensure that the motor is having at the right fever and to coordinate how much coolant that should be utilized. In the event that it isn't working then the vehicle is probably going to overheat. Try not to allow this to occur in the event that You can keep away from it. Overheating twists the head gasket,which prompts seriously overheating,which thusly will ultimately break the head gasket. This is a multi-thousand dollar fixAnd requires days to do Yourself. The sensor is just 20 or 30 bucks to supplant,so in the event that it isn't working then,at that point,ensure You sort it out immediately.