post #1 of Old 10-23-2011, 08:09 AM Thread Starter
eeeep10
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1994 YJ Wrangler 
 
Join Date: Aug 2011
Location: oxford
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Excessive coolant pressure????

I seem to be running a really high coolant pressure in my 94???? Any ideas what this might be? Or what I need to check

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post #2 of Old 10-23-2011, 08:44 AM
rustyyj
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1987 YJ Wrangler 
 
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what temp do you normaly run at? what do you mean by high pressure? the pressure is controlled by the radiator cap. with a stock cap the system will be at about 13-15 psi (it should be stamped into the top of the rad cap)
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post #3 of Old 10-23-2011, 09:01 AM Thread Starter
eeeep10
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1994 YJ Wrangler 
 
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It's running around 190 to 200 usually. It started leaking out the bottom of the radiator and started to weap out of the cap and top hose
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post #4 of Old 10-23-2011, 09:05 AM
rustyyj
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1987 YJ Wrangler 
 
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if all that happened while running at 190-210 id spend the $4 and grab a new rad cap of correct pressure (have your parts guy look it up) its the ceap easy place to start...
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post #5 of Old 10-23-2011, 09:10 AM
johnny27030
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When you replace the cap make sure to clean out any debri where the cap seals off. If there is grit in there it could cause the cap not to releive pressure like it should. If this doesnt fix it then try flushing the system.....even though if you temp gauge is correct it should not need. Hopfully you dont have a blown head gasket. Has it overheated recently?
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post #6 of Old 10-23-2011, 10:22 AM
dodger889
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1989 YJ Wrangler 
 
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Remove radiator cap when cool start your engine let it warmup and look for air bubbles in the radiator. If found, you have a head gasket leaking.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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im just cheap, and cheap makes you creative.
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post #7 of Old 10-24-2011, 08:38 AM Thread Starter
eeeep10
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1994 YJ Wrangler 
 
Join Date: Aug 2011
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Ended up finding a small pin hole in the radiator, patched it up for now as a quick fix til i can replace it next weekend. After replacing it and driving it last night there was a pretty high pitch whistling sound. I'm not sure if it was the belt whistling bc it had gotten wet but I'll check it today
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post #8 of Old 10-24-2011, 07:02 PM
nembudonna
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Quote:
Originally Posted by eeeep10 View Post
Ended up finding a small pin hole in the radiator, patched it up for now as a quick fix til i can replace it next weekend. After replacing it and driving it last night there was a pretty high pitch whistling sound. I'm not sure if it was the belt whistling bc it had gotten wet but I'll check it today
Why would a pin hole in the radiator cause high pressure in the radiator? The pin hole may have been caused by high pressure.
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post #9 of Old 10-24-2011, 11:51 PM
nembudonna
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1990 YJ Wrangler 
 
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If your going to replace your radiator, I'll pay the shipping if you'll send me the one with the pin hole.
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