On a 2000 TJ lately I have been stumped with a couple of issues and need help on next action from the group...
- I bought the TJ in September and it was overheating so I changed the t-stat. Ever since then it has been using about a gallon of 50/50 coolant a month. However there are no external leaks that I can see or smell. When I changed the coolant and did the t-stat, I noticed some white crud around the cap and the filler but none has reappeared since then. Everything I have read points to a head gasket but nothing to confirm it though;
- Oil cap is clean, and oil level is around normal after over 500 miles since the change.
- Haven't pressured tested the system, will this tell all?
- Changed the plugs around the same time as the t-stat but they looked normal or just worn, check these again for a clean plug?
The other issue....
- After the Jeep is warmed up, typically from highway travel the pressure gauge at idle with drop and the check gauges light comes on. I have replaced the sending unit with a new one from the dealer (Mopar) and changed the oil and filter (10W30) and it still happens.
Don't know if the two issues are related although have seen some other posts that suggest they may be.
Any thoughts or ideas?
Thanks,
Tom