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Old 12-18-2011, 08:30 AM   #1
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Engine wont heat up

I have a 2000 wrangler sport that I picked up on a trade about a month ago. Everything seems great on it except it never seems to warm up. I replaced the thermostat with a 180 degree one and it didn't change anything. Temp still doesn't get above about 140 and heater is just barely blowing warm. Any ideas? Thanks!

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Old 12-18-2011, 10:38 AM   #2
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why did you replace with a 180 degree thermostat? was it a fail safe thermostat?

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Old 12-18-2011, 11:00 AM   #3
Knows a couple things...

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Your Jeep needs the proper 195 degree thermostat so the computer will be happy, the computer was programmed around that temperature thermostat. In really cold weather, the engine won't even warm up fully unless it is running a 195 degree thermostat. And in hot weather, know too that an engine won't run any cooler with a lower temperature thermostat... a thermostat's job is only to set the engine's minimum temperature. And the odds are very good your thermostat is simply defective or stuck open, replace it.

Make sure the thermostat is facing the right direction when you install it and if it has a bleed hole which helps bleed out trapped air, position the bleed hole at the top.
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Old 12-18-2011, 11:05 AM   #4
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With it only heating up to 140 degrees ur thermostat is stuck open, i have seen it many times with my jeep. I was using fail safe thermostats and nothing but problems with them, the last one my jeep didnt even overheat at all and it was stuck open again, your jeep should heat up to 195 within the first 3-4 miles of driving at least mine does. i would definitely rrecommend not using a fail safe thermostat.
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Old 12-19-2011, 08:56 PM   #5
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Back when i had my 89 pathfinder, when i first bought it i had the same problem. Changed thermostat and still wouldn't get warm. Turned out to be the fan clutch had siezed up and was keeping it from getting warm. Just a thought...
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Old 12-20-2011, 03:35 PM   #6
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Well it turns out it was the thermostat. I had installed a failsafe and it was bad. Thanks for the help it had me confused

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