Some one please HELP radiator cap keeps leaking coolant and pressure ! - JeepForum.com

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post #1 of 18 Old 01-18-2013, 08:59 PM Thread Starter
Ramblah
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Some one please HELP radiator cap keeps leaking coolant and pressure !

Hey I'm new to this forum and my first time on any forum ....well any ways I have a 94 Cherokee it's lifted with rims tires and gears also lockers front and back.... But my problem is while I'm driving on the road regular its okay and takes me any where with no problems but ONLY when I'm on the sand and pounding it full throttle and then once I shut it off my radiator cap lets out pressure and coolant ?? I just changed thermostat and radiator cap top radiator hose and flushed radiator it also has a 5 month old water pump and i know for a fact my HG isnt blown ! any one has any suggestions ? I need help please

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post #2 of 18 Old 01-18-2013, 09:06 PM
rugsucka
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If you are having an overheat condition at low speed, wheeling, idle then I would consider replacing the mechanical fan clutch. When it becomes weak, it may "feel" ok, but possibly not draw enough air over the radiator.

Another thing to consider is that your radiator may be plugged with bugs and mud between your a/c condenser and the radiator itself. Hose it off it that's the case - and inspect the radiator fins while you are at it.

It is possible that you have a defective rad cap. OEM is 16psi and Stant is a good aftermarket cap. Likewise your tstat could be defective, and for 4 bucks, putting a 195' tstat in could also resolve the problem.

I'd focus on the mech fan first.
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post #3 of 18 Old 01-18-2013, 10:42 PM Thread Starter
Ramblah
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Thanks rugsucka ill try an after market cap and try to shoot down the radiator and defenatly do the mech fan but I had a Tstat but it was stuck close so I just took it out an running with out it is that good ??
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post #4 of 18 Old 01-19-2013, 05:27 AM
seww
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Quote:
Originally Posted by Ramblah
Thanks rugsucka ill try an after market cap and try to shoot down the radiator and defenatly do the mech fan but I had a Tstat but it was stuck close so I just took it out an running with out it is that good ??
You should not run the Jeep without a t-stat. It wont run at operating temp which may cause damage to the engine.
But an OEM stat, 195*. Stat!

1997 black XJ, I6 4.0, AW4, NP242 (stock)
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post #5 of 18 Old 01-19-2013, 08:27 AM
djb383
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Quote:
Originally Posted by Ramblah View Post
.......but ONLY when I'm.......pounding it full throttle and then once I shut it off my radiator cap lets out pressure and coolant.........
In a normal heat cycle, the cap is supposed to release pressure/coolant to the recovery bottle. As the motor cools, coolant returns to the radiator via the rad cap.....presuming the cooling system is leak free and the 2 way valve in the rad cap functions correctly. Install a t-stat.

Man Law - hoods should be raised at least once a week.....have a look see.
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post #6 of 18 Old 01-19-2013, 12:07 PM Thread Starter
Ramblah
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Well ill try and put backing the tstat right now and take it for a drive on the and and see how it does
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post #7 of 18 Old 01-19-2013, 12:20 PM Thread Starter
Ramblah
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Another thing is that there's two fans one that's always on another one next to it but that one never ever turns on what's that one for ? I have ac but don't use it at all but when I do turn it on that fan still don't kick in could that be a problem ?
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post #8 of 18 Old 01-19-2013, 02:43 PM
rugsucka
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The mechanical fan is on the passenger side. It is belt driven and 'always' on. It has a clutch that clamps up with elevated rad temperatures passing over it. If you don't hear a fairly strong fan 'roar' it could be defective. Feel is not good enough - it always has some drag, but will firm up more with higher temps.

The Electric fan is on the drivers side and comes on based on coolant temperature. Once my coolant hits the 210' mark, the e-fan will kick on until the temperatures slide back down. You will often hear it stopped at a light or when idling on a trail.

You NEED a tstat, and it should be 195' and your rad cap 16psi. Make sure the cap is attached properly. Don't laugh, it's been done.
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post #9 of 18 Old 01-19-2013, 03:28 PM Thread Starter
Ramblah
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Ok I'm putting in the tstat now and we see if the driver side fan kicks in or not and I just bought a 16psi rad cap cuz the one I had was 13psi
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post #10 of 18 Old 01-19-2013, 05:26 PM Thread Starter
Ramblah
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I just put in the brand new thermostat and flushed the radiator with 50/50 coolant . But didnt get a chance to go wheeling in the sand yet . But Ill keep all you posted ill take it wheeling today for Shure
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post #11 of 18 Old 01-19-2013, 07:07 PM
austinaubinoe
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And dont worry, running with out a t stat will not damage a 4.0! HAHA
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post #12 of 18 Old 01-19-2013, 07:13 PM Thread Starter
Ramblah
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Just got back from wheeling it only did it a lil bit so I'm going to change the cap cause it seems like the cap but in the mean time any other suggestions ?
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post #13 of 18 Old 01-19-2013, 07:28 PM
flexyxj
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There is a wiring harness kit available that plugs into the factory harness that allows you to turn on the electric fan with a switch on the dash. I bought it on Ebay several years ago and it was a well made set-up with detailed instructions.Also, spend 50$ and replace your fan clutch on the mechanical fan.
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post #14 of 18 Old 01-19-2013, 07:28 PM Thread Starter
Ramblah
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Does any one know where I can get a stant radiator cap ? Would napa or oreailly have it ?
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post #15 of 18 Old 01-19-2013, 07:30 PM Thread Starter
Ramblah
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I live in hawaii and there charging me 145$ for a fan clutch !
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