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what is going on?! SECOND water pump, fail safe t-stat. STILL overheating!

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Old Jul 28, 2010 | 11:19 PM
  #1  
swabyjustin's Avatar
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From: Los Angeles
Year: 1991
Model: Cherokee
Default what is going on?! SECOND water pump, fail safe t-stat. STILL overheating!

I dont know whats going on with my jeep.

Ive just replaced my t-stat with a new fail safe version and today replaced my water pump for the second time in 2 weeks.

the first round I replaced my t-stat and water pump and drove around and jeep overheated. so I say, I guess I just got a defective water pump. so i go get the most expensive best one.

it still overheats and no water is pumping through the upper hose, that i can feel or tell when I hold the hose in my hand with the engine running.

does anybody have any pointers, tips or ideas of what might be going on?

anything would be awesome!

Thanks guys

I guess my question is should water be flowing through the upper hose that goes to the t-stat all the time? or will it take a few to kick in and start flowing?

Last edited by swabyjustin; Jul 28, 2010 at 11:25 PM.
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Old Jul 28, 2010 | 11:42 PM
  #2  
swabyjustin's Avatar
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From: Los Angeles
Year: 1991
Model: Cherokee
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I have two posts up about this problem. sorry everyone.

I just let it run and bled the system, after about 5 minutes of running the water started flowing out of the radiator cap. what does this mean!!!! I dont get this and Im at the end of my rope!

Im moving tomorrow and I HAVE NO CAR!
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Old Jul 28, 2010 | 11:48 PM
  #3  
the jeep man 94's Avatar
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From: eden ny
Year: 2000
Model: Cherokee
Engine: 4.o l ho
Default

it mit not be the water pump but try this the breather tube/line thats connects at the back of the valve cover mit be pluged up clean it or buy new one then get get some sea foam at auto parts store clean the motor out should work or post back
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Old Jul 29, 2010 | 04:20 AM
  #4  
tmilford34's Avatar
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From: Birmingham, Al
Year: 1990
Model: Cherokee
Engine: 4.0
Default

I had the same problem with mine, it was getting an air bubble stuck by the thermostat and took forever for it to open up, once i got it open i would close the cap on the resevoir and let it pressurize the system and the water would slowly bleed into the engine then fill the resevoir back up . after doing this for about30 minutes the system was full and never had another problem, its a PITA but it worked and since i didnt have a radiator cap( only resevoir) it has to pressurize before it will suck water into the system
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Old Jul 29, 2010 | 04:28 AM
  #5  
fantic238's Avatar
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Joined: Jun 2009
Posts: 5,383
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Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
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What kind of thermostat valve di you install?
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Old Jul 29, 2010 | 05:39 AM
  #6  
rich's Avatar
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Posts: 1,371
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From: morrisonville ny
Year: 2000 @ 1994 givin away
Model: Cherokee
Engine: 4.0
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Get rid of that fail safe t stat they are junk and most of the time dont work right get one from the dealer.
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Old Jul 29, 2010 | 05:48 AM
  #7  
Paintballa0788's Avatar
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From: Atlanta
Year: 90
Model: Cherokee
Engine: 4.0
Default

srry bro,
dont have time to read everthing....
But I dont reccomend Fail safes.... I put 2 of them in my jeep and over heated like crazy.... put in a diff brand, and bam.... No issues....
So I'd look at that first...
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Old Jul 29, 2010 | 07:56 AM
  #8  
djb383's Avatar
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From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Default

Radiator could be plugged. Why would u need 2 water pumps so soon?
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Old Jul 29, 2010 | 02:33 PM
  #9  
ozdog210's Avatar
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From: Ayer MA
Year: 2001
Model: Cherokee
Engine: 4.0L
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Or the problem that I had was that she overheated too many times and the fins started crumbling out of the radiator rendering it ineffective to do its job....went to a junkyard and found one brand new in the bow for 100$!! definite score!
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