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arisGC 04-29-2013 04:50 PM

Overheating issue
Hi Guys,

I have 06 GC 4.7L 4WD with about 76k miles and original issues are exhaust manifold bolts broke off and water pump gasket leak. I replaced the exhaust manifold gasket and broken bolts and the water pump gasket and installed new antifreeze from Mopar. Now the issue is the car overheats as soon as I installed the rad cap and starts driving. Below is what I did so far. Any help would be greatly appreciated.

Replaced and performed the following.
-Thermostat and radiator cap.
-Purge all the air and ran heater to max while purging the air.
-Disconnected upper and lower rad hoses and ran water for few minutes and I have a good water flow on the lower and good water flow if I block the lower port.
-The antifreeze will start coming out of the radiator fill port if I rev the engine with the rad cap off so I think the water pump is OK.
-The car WILL NOT overheat as long the rad cap is off and not driving.

What I noticed when filling up the radiator with antifreeze it takes a while before I see the fluid on the upper hose thru the purge outlet. I have feeling that I have head gasket leak or I hope just blockage somewhere in the radiator. Any idea?:confused:

Patriotism_100% 04-30-2013 12:05 AM

Re: Overheating issue
I'm assuming that you bleed it in the process above to purge air.

Maybe a new radiator is worst case scenario.

arisGC 04-30-2013 08:08 AM

Re: Overheating issue

Originally Posted by Patriotism_100% (Post 814382)
I'm assuming that you bleed it in the process above to purge air.

Maybe a new radiator is worst case scenario.

Thank you for your reply. It turned out I had improper mixture of antifreeze. The guy at the Jeep parts dealership told me I did not have to do anything with the antifreeze which was wrong. I end up flashing the entire system including the heating core and blew out all the tap water. I had to pirchased two gallons of antifreeze and two gallons of distilled water. Now I have plenty extra to last for a long time and issue is resolved. Notes to all out there, avoid using the premixed green antifreeze on your Jeep. :)

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