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  #25  
Old 07-16-2012, 10:49 AM
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Re: 2000 WJ 4.7l Overheating

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Originally Posted by scjeep4.7HO View Post
Water pump impeller could be starting to slip. It would be more likely to slip more at first under higher load.

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So I just bought a new water pump, but I'm hesitant to replace it there's really no signs that it's bad other than overheating would'nt wobble or be loose with the belf off?

So I must ask how is it possible for the impeller to slip there's a big nut right in the center of the impeller on the new one which I would assume goes to the shaft through to the pulley... I'm assuming the water pump will turn at the same RPM's as the engine.

Just trying to understand
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Old 07-16-2012, 11:23 AM
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its plastic looks like a squirrel cage just 1/2-3/4 " thick they like to melt deform deflect..example my cousins i6 water pump every year like clock work

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  #27  
Old 07-16-2012, 12:23 PM
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Re: 2000 WJ 4.7l Overheating

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Originally Posted by hoffmanestates View Post
its plastic looks like a squirrel cage just 1/2-3/4 " thick they like to melt deform deflect..example my cousins i6 water pump every year like clock work

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Any Symptoms that he's noticed when it goes out, the belt turns the water pump thats why I'm having such a rough time with this. I guess I just can't wrap my head around how it could slip...the belt would have to slip right??
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Old 07-16-2012, 02:29 PM
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Re: 2000 WJ 4.7l Overheating

No, the belt doesn't have to slip, it can be that the impeller gets loose from the drive shaft and you won't see a thing of it from the outside. No play on the pulley or anything. Only by removing the old pump you will be sure if it is loose or not.
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  #29  
Old 07-16-2012, 04:23 PM
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if u.do pump or 180 t stat get water wetter or other additive for.coolant and.use distilled water. it will help

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Old 07-16-2012, 05:08 PM
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I been pondering what's your tranny temp? is it external.cooler or in radiator... as if its radiator then that heat needs to disapate. and you running a.c as you are hill.climbing? or no affect just popped into mind yo ask. might be a factor

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Old 07-17-2012, 09:30 AM
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Re: 2000 WJ 4.7l Overheating

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Originally Posted by hoffmanestates View Post
I been pondering what's your tranny temp? is it external.cooler or in radiator... as if its radiator then that heat needs to disapate. and you running a.c as you are hill.climbing? or no affect just popped into mind yo ask. might be a factor

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Don't know the Tranny temp...but I know it has the Tow Package, it's the stock setup in the radiator, it overheats the same with or without the AC on...yesterday it was low 70's and it didn't overheat at all going up the hill.

What's your thoughts?
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Old 07-17-2012, 11:00 AM
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seeing u are doing a moderate amount of up hill. I would do 180 stat and go from.there.. but.suck having to drop coolant again.for a water pump...

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Old 07-17-2012, 11:23 AM
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Quote:
Originally Posted by hoffmanestates View Post
seeing u are doing a moderate amount of up hill. I would do 180 stat and go from.there.. but.suck having to drop coolant again.for a water pump...

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You have to do coolant to change t stat too. Wouldn't hurt to install a tranny cooler too.

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  #34  
Old 07-17-2012, 11:44 AM
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Re: 2000 WJ 4.7l Overheating

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Originally Posted by scjeep4.7HO View Post
You have to do coolant to change t stat too. Wouldn't hurt to install a tranny cooler too.

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I've contemplated this for a while ended up putting the stock 195 tstat in. I've heard mixed emotions about the 180 tstat, makes the car run a little diff, cooler obviously but consumes more gas.

When installing a tranny cooler, I'm assuming you use the existing lines and just re-route. You would think they would come stock with a tranny cooler having the tow package .

I'm still left to wonder why it's overheating though, it shouldn't regardless of going up hill or not. There's an underlying problem here and although down the road I will put the Tranny cooler on, I think I need to find this gremlin.

Update: Water Pump is in crossing my fingers!!!!
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Old 07-25-2012, 09:15 AM
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Re: 2000 WJ 4.7l Overheating

Well water pump was fine but I put the new one in just in case. This proved to be a no go it's still overheating...

Thoughts anyone?????
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Old 07-25-2012, 10:09 AM
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tranny cooler might help.... or t stat

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