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over heating

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Old 07-21-2010 | 11:52 AM
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the jeep man 94's Avatar
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Default over heating

having problems heat! drained rad. put new anti freeze in took it for a lap in the back yard 1.6acras and o the way back it jumped to about 250 on the temp gauge


could it be the water pump ?
Old 07-21-2010 | 12:06 PM
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any help
Old 07-21-2010 | 12:09 PM
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what mixture did you use??
Old 07-21-2010 | 02:31 PM
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50/50
Old 07-21-2010 | 02:32 PM
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did you blurp for air?
Old 07-21-2010 | 02:38 PM
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what do you mean i drained it and put new stuff in
Old 07-21-2010 | 02:43 PM
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if there is air in your system (even with an open cooling system) it will run hot.
Old 07-21-2010 | 02:48 PM
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o ya not sure dont think so but it will run fine for like 5-10 mins but if you punch it a few times it jumps up 250 and 260 is max! i just dont want to blow it up ! so is it the water pump ?
Old 07-21-2010 | 02:57 PM
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Let it idle with the radiator cap off, just trickle a little 50/50 mix in as the radiator needs it, when the thermostat opens you should see water flow and the level may drop, just add a little more of the mix. This is burping the radiator, if you leave the cap on then there is nowhere for the air to go. You should always burp it whenever you change fluid or open the cooling system. Once you are satisified that you have the air out replace the cap and insure the overflow jug is full to the hot line, after the engine cools you should notice that the level dropped in the overflow reseviour.

I doubt it is your water pump if you have had no previous symptoms, probably just air but make sure you monitor the temp throughout the process.

Could also be a flaky tempurature sending unit.

Remember, just trickle water in, never fill an empty radiator on a hot vehicle, running or not, if the water can't mix in the radiator the cold water can crack a block or head.
Old 07-21-2010 | 02:57 PM
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are your fans kicking on is the next question?

a way to check the condition of your clutch fan is to while running have someone shut off the engine and it should take 2 turns max for the fan to stop. if it spins pretty freely then the clutch is gone on the fan.

also turn on your ac and see if the fan kicks on.

it may be the water pump, but just trying to save ya money so you only have to buy one part =] also a new temp sending unit may be the problem
Old 07-21-2010 | 03:02 PM
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ok il try that out but i know that its heating up bc the rad starts steaming up
Old 07-21-2010 | 03:17 PM
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Default Just had that problem

You need to bleed "burp" the system. Can be a pain. Here is what I did:

Pull the upper hose off of the radiator and pour 50/50 mixturre in until full (leave the lid off of the tank)

Put the hose back on

Pull the temp sending unit out (back of the engine right on the head)

Run engine until antifeeeze comes out.

Refill talk as necessary.
Old 07-22-2010 | 10:42 AM
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il do that after work
Old 07-22-2010 | 01:43 PM
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Did you replace the thermostat? Because if it's warming up THAT fast, that screams that the thermostat doesn't seem to be opening.
Old 07-22-2010 | 05:00 PM
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no i did not



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