Question about 1987 Jeep Comanche

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87 jeep Comanche running up to 220 to 230, the boils when shut off. New radiator, new pump, new hoses, new thermostat, belts tight etc.. Is there two different pumps for this truck? Each running in the opposite direction? My thermostat is opening at around 185.

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  • Jeep Master
  • 4,336 Answers

Your thermostat seems too low, all emission stuff will not shift at too low of temp. There is nothing wrong with a 230 or higher heat soak condition. Pushing out coolant, however is inconvenient...If you are topping it up each time, consider trying to let is spit out during this heat soak and just drive it...it may stabilize after a time or two.

You cannot do anything about heat soak, except electric fans, but engines have always done it, it is physics and causes not harm.

Doubt there would be a different pump direction.

And I think 195 may be the temp that you want in thermostat... parts place has the spec.

If overheating, fix that, but your description did not say you overheat on the road...I would not get worried until gauge pegs.Temp is a good thing... Too low thermostat leads to premature engine failure and unnecessary emissions. you NEVER heat the oil enough at too low temp.

Posted on Sep 05, 2010

  • sonandersons Sep 05, 2010

    Thanks for your reply. I'll check it out further.

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I don't know how did you test your radiator but if you apply below steps you can clarify your problem easier.

If you want to test your radiator:
A) Park your car (it takes more longer to get real temperature values, if the car is moving)
B) Start the engine (don't forget to engage handbrake)
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If bottom radiator hose is still cold, it means there is a problem at thermostat. If you see any leakage at thermostat housing at the end of above step C, you need to renew thermostat housing gasket too. Even if you buy new thermostat, i suggest you to test it before assembly. If new thermostat doesn't open enough, your car may run so hot.

If you would like to test your thermostat:
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