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Unread 09-19-2010, 09:25 PM   #1
TheGroogruxKing
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1993 YJ Wrangler 
 
Join Date: Apr 2010
Location: Columbus
Posts: 39
Temp fluctuates w/ new radiator, already burped

My radiator was leaking so I replaced it with a used one from a TJ, now my temp fluctuates from 210-225 over and over when the Jeep is running. It will slowly climb to 225 then abruptly drop to 210. I ran it with the radiator cap off to burp it and get air out of the system, and each time it reached 225 the coolant level would rise then a bubble would come out then the coolant level would drop again. I thought that this was working to get the air out, but after an hour of running it this way it was still doing it. How much air could be in there? How long does it normally take to compleatly burp it? Or is there something else wrong? Prior to the radiator swap the temp was steady at 215 or so, other than the leak there was nothing wrong with it.

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Unread 09-19-2010, 10:00 PM   #2
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
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Completely burping the cooling system has taken at least 3 total warm up and cool down cycles on my most troublesome install.


I try to park with the front wheels considerably higher than the rear wheels so the cap is as high as possible in the system.

Don't forget to make sure the heater has good flow.

Thermostats can stick and cause temp fluctuations, especially when warming up (temp overshoots normal opening point, then rapidly drops when it finally opens).

Keep after it, you will get it.
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Unread 09-19-2010, 10:14 PM   #3
moonshinefuel
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Put a Robertshaw 190 degree thermostat in it if you have not replaced that yet.
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Unread 09-19-2010, 11:29 PM   #4
TheGroogruxKing
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1993 YJ Wrangler 
 
Join Date: Apr 2010
Location: Columbus
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I haven't replaced the tstat yet, but I didn't have any problems before the radiator swap, the temp was always steady. I'll try burping it again with the front wheels on ramps this time, hopefully that will get all the air out.
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Unread 09-19-2010, 11:40 PM   #5
AnonymousD
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1992 YJ Wrangler 
 
Join Date: Jul 2010
Location: Louisiana
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With my Mustang I had to back it into a shallow ditch once to get all the air out. Shouldnt be a problem putting a Jeep in a ditch though. You could probably do the ramps AND the ditch, lol.
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Unread 09-19-2010, 11:47 PM   #6
TheGroogruxKing
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1993 YJ Wrangler 
 
Join Date: Apr 2010
Location: Columbus
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Also, it seemed like there was a lot more air bubbling out with the heater off than there was with the heater on. Is there anything to that? The temp fluctuations were the same, just smaller burps.
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Unread 09-20-2010, 01:31 PM   #7
Matt The Hammer
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1995 YJ Wrangler 
 
Join Date: Oct 2007
Location: Westville, NJ
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You're worrying too much with this. Just drive it, park it, let it cool, fill. Few times and you'll get all the air out. Never really had any success with 'burping' it with the cap off and the while thing running. All I do is end up spilling more coolant...

T-stats are cheap. They're also crap. So like 'moonshinefuel' stated, replace it. Easier now than any other time (before it's 10 degrees out!). You should be at 190 anyway. These things don't last forever.

The radiator cap is already at the system's highest point, so air will go there once the t-stat opens while running.
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