Question about 1996 Jeep Grand Cherokee

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Overheating The water pump ant thermostat has been replace and hoses are good. Jeep will run about 15 minutes, Over heat and shut down engin. Any suggestion. Dealership can?t find problem.

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  • Russell Bailey May 11, 2010

    is this a 4.0l engine...and why was water pump replaced...it is possible wrong water pump was installed..the pumps are different for the 4.0 between a grand cherokee and a cherokee...the housings r the same but the otation is opposite.

  • yadayada
    yadayada May 11, 2010

    Have you had the radiator rodded out?

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Who did the replacement of the parts? Was it done at a shop or at home? Do you know if the cooling system was "burped" after the parts were installed and the coolant was refilled? If you're not sure, burp the radiator. This is easy to do. Jack up the vehicle so that the thermostat is angled upward. Start the car and let it idle until it's 3/4 of the way to overheating, then shut it off and allow it to cool down somewhat. Then pop the cap, let the coolant drain down, and refill it. Restart the vehicle and repeat the process, until the coolant level doesn't drop anymore.

What you're doing is this - anytime the cooling system is opened up, especially when the fluid is drained and parts are replaced, air gets into the system. When you reassemble and refill with coolant, you trap air bubbles in the system. Since the system is sealed, it operates under pressure. As the car runs, the coolant and the air bubbles are circulated. The bubbles get caught behind the thermostat (if you have it angled upward) and keep it from opening. This causes the engine to heat up to the point of overheating. You want to allow it to get about 3/4 of the way to an overheat so that you know the air bubbles are blocking the thermostat. Shutting down the car stops it from heating up to the point of damage, and allows the system time to cool off so that when you pop the cap, you don't get an explosion of coolant in your face. Once it's cool enough to open the system, you open it and release the pressure. This allows the thermostat to open and bleed the bubbles upward to the open cap, where they "burp" into the air. The space they took up fills with coolant, which is why your coolant level drains down. You top it off and repeat to make sure that all the bubbles are out. You'll know you're in good shape when you let it run and it gets to operating temperature and doesn't overheat anymore. Let it cool that final time, open the cap, and since you have no air pockets left in the system, nothing will burp out and your coolant level won't decrease. Then you should be good to go - put the cap back on and drive away happy.

Posted on Sep 28, 2008

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Overheating 97 Lincon Town car


Connie, Were the radiator,water pump and thermostat replaced to try and fix the over heat issue or as maintenance. Engine overheating can be caused by a lot of things, Leak in cooling system, air in system, bad rad. cap, slipping belt, faulty thermostat or installed upside down, faulty water pump, plugged radiator (inside/outside), collapsing rad hose, faulty cooling fan, leaking head gasket, sludge plugging engine water passages, poorly tuned engine, etc..
Take into a good shop for diagnoses and estimate for repair. Check the attached links,instruction and guides, Good luck
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Why does my Grand Cherokee overheat after replacing the radiator?


there are many causes of overheating.

first off is you didnt stated engine option (size)

the engine can make excessive heat too. (late timing)

1: bad thermostat. 190 is ok, but it can be bad, even a new one.

try a quality brand like STANT, not dura . etc.

2: it must hold pressure, bad cap>? 12-15 psi

3: gee, did use 50% AF. it will not run right with out AF antifreeze.

4: bad water pump. running old AF causes the impeller to rust to nothing.

5: thermostat up side down, or bleed hole not up hill (jiggle pin,etc)

6: pressure in the hose , does NOT prove flow. only pressure.

7: air flow to RAD bocked, (at A/C condensor or between)

8: bad fan and related parts, varies by engine option not stated.

9: bad fan controls. same.

10: seem like it overheats even PARKED. right? never moved.

11: if it dont overheat moving fast this is a BIG clue. but nobody wants to take that risk of 10 is true. sure.

12: air in block, did you , ignore the side tank and look in side rad for full of AF 100% by pulling cap cold, over and over, each cold cycle

until dead sure its FULL???????

13: BAD TEMP GUAGE, DID YOU USE AN IR PYYO GUN to prove the thing is really overheating

14: is it boiling over, that is steam or hot water blasting to the expansion side tank???? signs/ got real signs of overheating?



15: passes rad leak down test?

16: passes exhaust leak test to rad test? green/blue checked?

17: steam out tail pipe end hot?

18: pinging, (too hot sighs)

19: OBD2 scan tool shows, 240 and the dash gauge and the pyro gun

all agree its 240"

20: sludge packup on sides of water jackets, seen when pump was pulled and NOT CORRECTED (flushed>?)



at the least.

ok one more , fan belts slip?

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1 Answer

Car started knocking really bad got a cylinder 2 misfire code after opening coolant bleed valve with enging hot


Okay, it may be due to overheating, that may be the noise you heard, lets hope. first allow engine to cool, open radiator cap or the resivoir cap, which ever is the fill, remove the bleeder at top hose and fill radiator slowly until coolant comes out bleeder.

note if water pump was replaced due to leaking and engine was overheated at that time then it may be a good idea to replace the thermostat .
after filling is done start engine and allow it to run. watch temperature if temp start to climb past half way shut engine down and let sit for 5min. then restart and check level, in res do not open cap . feel air from fan and see if it is getting hot, this may take up to a half hour but do not drive,

A few questions, does this jeep have an electric fan?
when you heard the knocking was engine temp hot?
If you start jeep cold does engine knock?
Did this jeep get a new thermostat with waterpump job?
did it overheat when pump went bad and why did water pump get replaced?

sorry for all the questions ,just trying to get all the info to help you .

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