Hot To TROT

Anyone have problem with engine off percolation. After a hard pull on a hot day. If I shut the engine down quick the overflow tank will almost fill. It's never overfilled. But has come close. I have just open the hood let the engine run for a few minutes before key off seem to take care of it. Temp runs at 210 not a bit higher. 110k miles 01 4.0 I6 5 speed. New rad cap. I turn the AC off if I see a long pull coming. Is this just the way she is or do I have a problem?

What year?? Is it the open system or the newer closed style??

I would suspect a flow problem of some sort. Maybe the rad core is coroded or the water pump is not circulating enough flow.

JD

What year?? Is it the open system or the newer closed style??

I would suspect a flow problem of some sort. Maybe the rad core is coroded or the water pump is not circulating enough flow.

JD


Definately sounds like a water pump issue - hot spots forming in the engine block. Of course if its a closed system then there is air pockets in it - convert to a open system!

his is the new open sytem, 2001 model

his is the new open sytem, 2001 model



Holy Crap! If its still under warranty Id take it in and let the dealer worry about it!

Shouldnt flow back to the overflow like that. Now SOME back and forth flow is normal but not as violent as he describes it!

BTW - On the inline 210 is about normal running temp!

Thanks for all the help. A new water pump sounds like a good idea. All ready got a new 3 row rad but have not put it in. Plus I will be lighting the load this year. All rugrat will be in collage :)

If she is not going above 210 you have a very normally operating engine. That's where it needs to be. My '94 used to get up to 220 degrees on a hot day pulling a hill or in heavy traffic. My new off the lot
2000 Sport with the same equipment has always run 210 since it had 5 miles on it. The 4.0L engines are supposed to run between 210 and 220 to keep all the emissions systems happy. I suspect they run hotter than say Dad and Mom's new Buick and that's perfectly fine. If the coolant is at a rolling boil though, that is what I would call overheating, but definately not 210 degrees.
tb

I ran a compression check, incase of a blown head jasket.
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but definately not 210 degrees
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The fact that she NEVER goes over 210 no mater what he** I put her through now makes me think I may have a bad gauge or sensor. Besides a weak pump or rad. The simple things just have to bite you in the butt before you see them sometimes. Thanks EVERYONE for all you help.
Ron