Car Information:
Jeep Wrangler
Year: 1991
Engine Size: 4.0
Trans: Automatic

Issue / Question:
The temp gauge shows engine running at 235 all the time. I got a new radiator, water pump, fan clutch, temp sender, and several new 195 thermostats. But when warming up, the temp swings to 235 then drops back a little and then holds at 235. Engine does not appear to run hot. Even replaced factory gauges with another set with no change.


In a case like this I use an electronic pyrometer. It’s an inferred temp gun you aim and pull a trigger and the temp of whatever you aim at registers and shows you the temp. The lower hose shows what the return temp is after the coolant goes through the radiator. The upper hose shows you the max temp of the coolant going into the radiator before it gets cooled in the radiator. This method will help find if there’s a problem. I don’t think a 195 thermostat would.

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Magic Mechanic
1432 Lee Road OrlandoFL32804 USA 
 • (407) 298-7447