I need some help with my 2002 TJ for all of you mechanics out there. No one has been able to figure this out.
After about 20 minutes of driving, and usually at a stop light or something, my temperature gauge needle will suddenly and quickly dip down into the red and the check gauges light will come on. About 30 seconds later, and whether still stopped or moving, the needle will move back to normal just as quickly as it dipped down. I don't think it's possible for the engine to actually be overheating and cooling down this quickly. Could it just be a sensor or something maybe? That seems to be the consensus.. but what sensor is it, where is it located, and how do I change it?
Things I have already done to try and fix this based on the advice of others:
- Switched out thermostat with brand new one
- "Burped" coolant system
- Emptied and refilled radiator
Thanks in advance to anyone who takes the time to help me out!