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Unread 11-22-2011, 10:32 PM   #1
Dan69
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Overheating Problem after radiator flush

Maybe someone can help me out here. I flushed the radiator on my 2003 cherokee 4.0 and filled it with new fluid. After the back flush and fill a couple of days later it started overheating sometimes (not all the time). It's overheated about 4 times this month. it never had this happen untill after the backflush and fill.

This is what I did originally:
drained the radiator
backflushed the system and drained it again
refilled with anti-freeze
let it warm up and cool down
top it off again
let it warm up and cool down
top it off again


It was full after the last warm up, but three days later it overheated. The overflow bottle was completely full after the overheat like it backed a lot of fluid into it. When it cooled off it pulled the fluid back into the radiator. No problems for a few days and then it did it again.

I'm at a loss on why this is happening. It seems like I did something maybe when I flushed the system, but I can't think of anything that would cause this. Any help would be greatly appreciated

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Unread 11-22-2011, 10:50 PM   #2
Reptile
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What coolant/water mixture did you use? Sounds like a bad rad cap.
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Unread 11-23-2011, 12:27 AM   #3
Dan69
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i used a 50/50 mix, but didn't use the Dexcool. if the radiator cap was bad, could it bypass enough coolant into the overflow tank to make it overheat?
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Unread 11-23-2011, 12:28 AM   #4
matt62485
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im assuming this is a WJ and not an XJ b/c it's an 03, but I know the late model XJ's with the 0331 heads are prone to cracking/overheating issues, not sure if an 03 GC would have the same head or not. any water in the oil?

make sure theres nothing some crap in the thermostat. radiator caps are a common issue too.
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Unread 11-23-2011, 06:25 AM   #5
jjshbetz11
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Does your thermostat have the little hole in it so you don't have to burp the system? If not burp it.

sent from a flat black thingie
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Unread 11-23-2011, 07:21 AM   #6
bobbo_xj
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double check that your electric fan is connected and working
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Unread 11-23-2011, 07:37 AM   #7
FairlanePhil
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03 Cherokee?
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Unread 11-23-2011, 08:08 AM   #8
bobbo_xj
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Quote:
Originally Posted by FairlanePhil View Post
03 Cherokee?
Maybe OP is from powder springs, china... Or we just happily entered a parallel universe where XJ's are still being made in the states.
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Unread 11-23-2011, 09:37 AM   #9
Reptile
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Quote:
Originally Posted by Dan69 View Post
i used a 50/50 mix, but didn't use the Dexcool. if the radiator cap was bad, could it bypass enough coolant into the overflow tank to make it overheat?
I hope you didn't use Dexcool, but that wouldn't cause the problem. No the rad cap builds up pressure and increases the boilling point of the coolant. If the cap is bad, then boiling makes it overheat and overflow through the cap.

Quote:
Originally Posted by bobbo_xj View Post
Maybe OP is from powder springs, china... Or we just happily entered a parallel universe where XJ's are still being made in the states.
I'm going with parallel universe. That's the most logical explanation...
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Unread 11-23-2011, 08:55 PM   #10
FairlanePhil
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Unread 11-23-2011, 10:04 PM   #11
Azzy
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While it is running, squeeze the upper rad hose. Watch your fingers. You will hear any air coming out of the system, and going into the overflow tank.

The system is supposed to self burp, but I havent seen one do that yet.
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