Hey Robert==It should run from about 140 deg to 230 deg. Over about 260 deg. can harm the engine. Good luckJoe
The Thermostat is 210 deg - mine always runs within 10 deg.s either direction with the exception of heavy stop and go traffic will cause it to be higher.
the normal operating temp is 180 to 200 that's with pre 1993 318s and magnum 318s
the normal temp on most or all cars in that year range is 195 degrees
Around 60-70 lbs cold, 35-40 lbs at normal operating temperture, and 15-30 lbs warm at idle.
The minimum engine oil pressure at operating temperature is 15psi. You should see more than a 25psi when you operate at elevated RPMs.
Incoming air temperature sensor may be bad
190 to 200 degrees is perfect. / NORMAL.
Jeep Grand Cherokee was created in 1993.