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Running Temp

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Old 01-11-2011, 07:48 PM
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Year: 1989
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Default Running Temp
What temp range should a Jeep 4.0L from 1989 be running at after it gets warmed up?

At what temp does the thermostat open at?
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Old 01-11-2011, 07:50 PM
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190 - 210 F is pretty normal.

OEM thermostat should open at 195.
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Old 01-11-2011, 07:51 PM
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~200-205 seems to be the norm.
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Old 01-11-2011, 07:54 PM
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It runs at 195. Thermostat starts opening at about 185, fully open at 195.
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Old 01-11-2011, 08:09 PM
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FSM says the factory installed t-stat is closed below 195F.
Last edited by djb383; 01-11-2011 at 08:11 PM.
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Old 01-11-2011, 08:23 PM
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Originally Posted by red_dog007
What temp range should a Jeep 4.0L from 1989 be running at after it gets warmed up?...............
This time of year, right at whatever t-stat you're running. Six mos. from now, temps can easily spike well north of 210. The XJ rad is kinda dinky.
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Old 01-11-2011, 09:02 PM
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I cruise on the Highway at 210 with a slight drop below 210 every so often. Sitting idle it will slowly rise above 210 and my fan cools it down.
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Old 01-11-2011, 09:04 PM
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195 to 210 is normal running temp
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Old 01-11-2011, 09:08 PM
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i run about 200-210
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