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reservoir tank keeps blowing the cap off

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Old Jul 24, 2011 | 06:43 PM
  #1  
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From: suburbs of atlanta
Year: 1989
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Default reservoir tank keeps blowing the cap off

my reservoir tank will basically explode after only 10 min of driving. its done this so many times that the cap is striped. i was using electrical tape on the threads so the cap stays on and that worked for about 6 months but now it will "bubble" over every time i turn the jeep off. i keep plenty of water in it so idk what it is. HELP PLEASE.
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Old Jul 24, 2011 | 06:48 PM
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Are you talking about the coolant overflow tank or the radiator itself. If its the coolant overflow tank, you probably just have too much coolant in it. There should be a fill level on the coolant overflow that you fill it up to. Anything past that will jsut come out of the tank itself.
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Old Jul 24, 2011 | 06:53 PM
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Originally Posted by sam24th
Are you talking about the coolant overflow tank or the radiator itself. If its the coolant overflow tank, you probably just have too much coolant in it. There should be a fill level on the coolant overflow that you fill it up to. Anything past that will jsut come out of the tank itself.
yes the coolant overflow tank, there is no mark on mine but i always keep the coolent (in my case water) a bit below the hose that brings water back into the tank. idk if this is were the water should be but it comes out quite violently as if the hoses are filled with steam when it blows
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Old Jul 24, 2011 | 07:06 PM
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A blown head gasket will pass compression into the cooling system, causing it to overpressurize in about 10 minutes or so.

You need to have your "water" checked for combustion gasses.

Also, a 50/50 mix of antifreeze/coolant and water will increase the boiling point to about 240 degrees at sea level pressure.
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Old Jul 24, 2011 | 07:11 PM
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Originally Posted by Firestorm500
A blown head gasket will pass compression into the cooling system, causing it to overpressurize in about 10 minutes or so.

You need to have your "water" checked for combustion gasses.

Also, a 50/50 mix of antifreeze/coolant and water will increase the boiling point to about 240 degrees at sea level pressure.
dang i dont wanna hear that...
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Old Jul 24, 2011 | 08:03 PM
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My jeep did the exact same thing. and im pretty sure it might have been the gasket. but im not really sure. a quick fix tho is to release the pressure valve in the back of the block back behind the fuel rail. there is a little sensor on there it pulls right off you just take it off and let the air push itself out. its called "burping".
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Old Jul 24, 2011 | 08:39 PM
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Originally Posted by troyatl
my reservoir tank will basically explode after only 10 min of driving. its done this so many times that the cap is striped. i was using electrical tape on the threads so the cap stays on and that worked for about 6 months but now it will "bubble" over every time i turn the jeep off. i keep plenty of water in it so idk what it is. HELP PLEASE.
Replace your radiator cap. Get the stock pressure rating.
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Old Jul 25, 2011 | 02:20 AM
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Originally Posted by troyatl

dang i dont wanna hear that...
Don't worry its just blowing off a little steam :-):-).... what year jeep? If its a closed system pure going about it wrong.
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Old Jul 25, 2011 | 01:24 PM
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Originally Posted by Slick761
Don't worry its just blowing off a little steam :-):-).... what year jeep? If its a closed system pure going about it wrong.
its an 89, i think its closed
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Old Jul 25, 2011 | 02:54 PM
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Yes closed. You probably have air in your system. You need to Burp it and make sure you keep the pressure tank full up to the line and now you probably need a new cap.
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Old Jul 25, 2011 | 02:57 PM
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up grade to a open system and never have this issue again best fix i went thru 4 bottles and caps it get frustrating after a while
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Old Jul 25, 2011 | 03:02 PM
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I don't understand why I have never had an issue with this. I've had issues with everything else. The po was a complete idiot!
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Old Jul 25, 2011 | 04:30 PM
  #13  
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Originally Posted by freegdr
up grade to a open system and never have this issue again best fix i went thru 4 bottles and caps it get frustrating after a while
do you have to buy a new radiator to do this?
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Old Jul 25, 2011 | 04:33 PM
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Originally Posted by troyatl
yes the coolant overflow tank, there is no mark on mine but i always keep the coolent (in my case water) a bit below the hose that brings water back into the tank. idk if this is were the water should be but it comes out quite violently as if the hoses are filled with steam when it blows
I think you're only supposed to fill it to about one third of the tank.
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Old Jul 25, 2011 | 05:33 PM
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remove the hose from thermostat fill hose tell it comes out of block/thermostat then you know your full if cap leaks steam no leek no steam i had a problem with the hose that returns to the bottle its to different size it would blow steam on the cap then the cap would leak i put 3 caps on before i saw what was happening
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