XJTripp
NAXJA Forum User
- Location
- eastern North Carolina
1989 4.0 XJ. On Sunday as I was completing a 400 mi. trip, coolant temperature went up from 190 to 220 on my mechanical gauge. The conditions, load, etc. do not explain the change. I diagnosed it as a bad t-stat, which is about the only thing I hadn't replaced (157K miles). I changed the stat and noticed that it had a 180 degree stat in it. So as not to add another variable to the problem, I went back with a Stant 180 degree. Today with temps in the 90's and the AC on max, the coolant temp stays at 180 to 185 and hits 190 at stoplights in D with AC on. The T-stat was the problem.
Should I go back in and swap out the 180 stat for the OEM 195 stat? Will running a 185 temp keep me from going into the normal (is it open loop?) mode and thereby cost me mileage?
Should I go back in and swap out the 180 stat for the OEM 195 stat? Will running a 185 temp keep me from going into the normal (is it open loop?) mode and thereby cost me mileage?