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Unread 09-25-2009, 09:24 AM   #1
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2003 TJ Wrangler 
Join Date: Apr 2003
Location: Lansing, MI
Posts: 475
Burping the engine (new radiator )

OK just installed the new radiator and tested the jeep - it ran in the normal temp range but fluctuated. I've read that you have to "burp" the engine" to fix this but after searching the results usually came up as older 4.0 not the newer TJ's. So I have a 03 do I need to burp it or will the overflow bucket thing take care of it over time?

If I have to any suggestions on techniques? ?

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Unread 09-25-2009, 10:41 AM   #2
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2003 TJ Wrangler 
Join Date: Jan 2006
Location: Greenville, SC, South Carolina
Posts: 120
the easy way to get a motor to "burp" is park it on a incline.... with the radiator being at the highest point possible. Let it set for a bit, most of the remaining air will bubble up to the radiator cap. I've also had luck parking it level and opening the temp sensor slightly at the t-stat houseing for those small little bubbles...
2003 TJ 4.0 5-speed 31inch Goodyear Authority's, 2inch Rubicon Express Springs, Hella Vision Plus H/L's, IPF upgraded H/L wiring harness. JCR Offroad Stage 2 Frt Bumper with CocaCola Bottle opener, Smittybuilt XCR8 Winch, Rampage Bowless top.
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Unread 09-25-2009, 12:28 PM   #3
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2004 TJ Wrangler 
Join Date: Aug 2009
Location: canada, Nova Scotia
Posts: 571
just fill the rad and put some in the over flow tank....squeeze the upper rad hose a bit....put heater on hot..fan on high...start engine with rad cap off...let run for a bit while watching to level in the rad...when it starts to puke out the top it is full......always worked for me...good luck.
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