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resivoir tank!! help!


 
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suddz19
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Joined: 13 Jul 2006

PostPosted: Thu Jul 13, 2006 1:07 am    Post subject: resivoir tank!! help! Reply with quote

ok here is the story i just installed a manual swithc for my eltric face because it wasnt kicking on when it rreach high temps(just when idling) or whne the A/C was turned on. i rather have control of it anyway. well when my jeeps is turned off after running hot (210 or higher) the mix(coolant and water) is shot out of the resivoir tank and this is abnoramly hard too. The cap holds it on pretty well but it still leaks out adn make loud noises. why is the mix being pushed and reversed so hard out of the resivior tank? please give all ideas why and suggestions on what to do? thanks! Confused
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jppilot61
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Joined: 06 Mar 2004
Location: Tappahannock, VA

PostPosted: Thu Jul 13, 2006 1:37 am    Post subject: Reply with quote

My "guess" is since the automatic thermastatically controlled function of electric fan is not working, when you kill the engine the mechanical clutch fan stops turning effectively killing ALL airflow across radiator. Coolant boils over from residual engine heat and expands.

Either manually run electrical fan for several minutes (mimicking what anormally operating electrical fan would do or correct the automatic function?

Let me know how it works out though! I am curious!

Again, I'm not an expert though and I am sure someone else will chime in here too . . . .
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1992 XJ Laredo
RE6130 4.5" XJ Super-Flex Kit
RE1801 Slip Yoke Eliminator Kit NP231
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suddz19
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Joined: 13 Jul 2006

PostPosted: Fri Jul 14, 2006 6:26 am    Post subject: Reply with quote

yea some people thought it might be the water pump but that shuts off after the car is turned off. right? and plus i replaced the water pump a few years back. so i doubt it be that. so the fan is suppose to stay on after the jeep is turned off? is that normal for jeeeps? i jsut want it to stop kicking the mix out. rember it only kicks iit out after its been running hott. let me know if anyone has anymore to add! Smile
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jppilot61
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Joined: 06 Mar 2004
Location: Tappahannock, VA

PostPosted: Fri Jul 14, 2006 8:48 am    Post subject: Reply with quote

If I understand it right, the electric fan runs when temp exceeds certain temp (HOT) or also kicks in when AC is turned on (Defroster also uses AC to dehumidify!)

When you stop engine, Water pump stops turning/pumping. Engine reflects this as still being HOT!

Many automobiles (I'm NOT positive about JEEP) have warnings in engine compartment that electric fan may come on at any time, even when car turned completely off and engine is still hot . . . . .

I guess you would correct your problem by giving JEEP good coolant system checkup (flush/replace antifreeze, verify radiator cap holds pressure, no leaks, thermastat operates correctly, electric and mechanical fanassemblies both function correctly.

JEEPS usually have no overheating problems at high speeds (air moving over radiator mainly augmented by fan/s. It is at LOW speeds and stopped when it must rely on Fan/s alone.

One more guess, pressure test system, as it should hold pressure (coolant has higher boiling point when pressurized) if it is not holding pressure, MORE apt to boil over particuliarly at low speed/stopped.

Again, only my 2cents worth.

Remember when you are asking for free advice, you get what you pay for!
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1992 XJ Laredo
RE6130 4.5" XJ Super-Flex Kit
RE1801 Slip Yoke Eliminator Kit NP231
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rustbucket
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Joined: 02 Nov 2006

PostPosted: Sat Nov 04, 2006 9:30 pm    Post subject: re resevoir help Reply with quote

You may have a blown head gasket. Exhaust gas can leak into the cooling system and pressurize the system.
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Sat Nov 04, 2006 10:43 pm    Post subject: Re: re resevoir help Reply with quote

rustbucket wrote:
You may have a blown head gasket. Exhaust gas can leak into the cooling system and pressurize the system.

...Or a cracked cylinder head. My friends 95 XJ did what you're describing. Ran hot, and blew coolant after shut off. He got the head magna-fluxed, and found 10 cracks in it, like it had shattered.
There are tests you can do to see if the head/head gasket is bad.
Look for...
*milky, frothy oil.
*white exhaust smoke.
*air bubbles, yellow crud in overflow tank.
*spark plugs with deposits/clean spots.
**There's a product called Block Chek that tests for combustion gases in the cooling system. You can get Block Chek and/or its equivalent at Napa.
Block Chek:
http://www.blockchek.com/kits.htm
Block Chek Procedure:
http://www.blockchek.com/instructions.htm
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