kazzx Posted February 23, 2008 Share Posted February 23, 2008 Trying to sell my MJ and it would be alot easier if i could fix the overheating problem. Here is what i have done so far... Replaced: Fan Shroud Overflow Tank Thermostat WaterPump Hoses and clamps Its spewing out at the overflow tank at the top outlet. Did this on the old tank and is doing it again on the new one. Help! Link to comment Share on other sites More sharing options...
mvusse Posted February 23, 2008 Share Posted February 23, 2008 Is the fan working? If electric, is it running at all? If mechanical, is the clutch okay? Could also be a plugged radiator, or a cracked head gasket. Link to comment Share on other sites More sharing options...
kazzx Posted February 23, 2008 Author Share Posted February 23, 2008 Is the fan working? If electric, is it running at all? If mechanical, is the clutch okay? Could also be a plugged radiator, or a cracked head gasket. Mechanical Fan works fine. How do I "unplug" the radiator? Head gasket sounds fun. Link to comment Share on other sites More sharing options...
mvusse Posted February 23, 2008 Share Posted February 23, 2008 A pressure test will tell you if the radiator is good or not. If it is plugged up, you can have a radiator shop ream it out, or you can replace it, If you're being a smart alec, ignore this reply. Link to comment Share on other sites More sharing options...
kazzx Posted February 23, 2008 Author Share Posted February 23, 2008 A pressure test will tell you if the radiator is good or not. If it is plugged up, you can have a radiator shop ream it out, or you can replace it, If you're being a smart alec, ignore this reply. No, I'm being serious and I appreciate your input brotha. Link to comment Share on other sites More sharing options...
48wilys Posted February 23, 2008 Share Posted February 23, 2008 If this has ac check to see if mud is packed inbetween the condesor and rad. this was a prob on my brothers XJ. You also might try flushing the radiator, but I am not sure this would help. Overheating is a *&%^$ :mad: It could be 1000 different things. Link to comment Share on other sites More sharing options...
FxRacing282 Posted February 24, 2008 Share Posted February 24, 2008 flushing is a great idea. while your at it, replace the cap on the rad Link to comment Share on other sites More sharing options...
BLHTAZ Posted February 24, 2008 Share Posted February 24, 2008 That system is VERY sensitive to air in it. Did you properly bleed the air out of the system when you changed these parts? The problem you are describing sounds like the same issue I had when I did similar work and found out about the bleeding thing as I had never dealt with a closed cooling system before. replace the cap on the radFYI... Closed system...it doesn't have a cap unless it's been converted, but since he said it was blowing out of the bottle, doesn't sound like it's converted to me ;) . Link to comment Share on other sites More sharing options...
kazzx Posted February 24, 2008 Author Share Posted February 24, 2008 That system is VERY sensitive to air in it. Did you properly bleed the air out of the system when you changed these parts? The problem you are describing sounds like the same issue I had when I did similar work and found out about the bleeding thing as I had never dealt with a closed cooling system before. replace the cap on the radFYI... Closed system...it doesn't have a cap unless it's been converted, but since he said it was blowing out of the bottle, doesn't sound like it's converted to me ;) . No, i havnt bled any air out of it. How do i do such a thing? Link to comment Share on other sites More sharing options...
chicofuentes0224 Posted February 24, 2008 Share Posted February 24, 2008 With the back of the truck higher than the front. Start the engine and let it heat up some. Unscrew the temperature sender located on the driver's side of the head close to the valvecover gasket ( somebody ad a picture please.) when the air bubbles stop coming out and you only get coolant screw the sensor back in . Your done. Link to comment Share on other sites More sharing options...
BLHTAZ Posted February 24, 2008 Share Posted February 24, 2008 Yep...that's it. Don't get the engine too hot though or you won't be able to get your hands in there to remove & repalace that sensor. Mine was nearly completely cooled when I did it. The important thing is to have the front of the truck lower than the back so the air will all go to the rear of the head and out the sensor hole. Be sure that your plastic bottle has plenty of fluid in it as well. Link to comment Share on other sites More sharing options...
Oizarod115 Posted February 25, 2008 Share Posted February 25, 2008 i scanned through but i don't think anyone mentioned. that bottle isn't (shouldn't be) an overflow it should be a pressure bottle with a pressure cap on it. check the cap, and if you didn't get a pressure bottle try replacing it with one from the dealer. i think the cap is like 9 bucks through mopar. and check the temp of the engine with a laser gun! the gauge may be lying to you! Link to comment Share on other sites More sharing options...
kazzx Posted February 25, 2008 Author Share Posted February 25, 2008 i scanned through but i don't think anyone mentioned. that bottle isn't (shouldn't be) an overflow it should be a pressure bottle with a pressure cap on it. check the cap, and if you didn't get a pressure bottle try replacing it with one from the dealer. i think the cap is like 9 bucks through mopar. and check the temp of the engine with a laser gun! the gauge may be lying to you! It is a pressure bottle with the pressure cap. Link to comment Share on other sites More sharing options...
Eliminator89 Posted February 27, 2008 Share Posted February 27, 2008 I had an overheating problem with my Comanche. Turned out o lot of the fins between the tubes in the radiator had rotted away. Link to comment Share on other sites More sharing options...
kazzx Posted April 9, 2008 Author Share Posted April 9, 2008 On the sensor...do i unscrew just the little screw part or the whole thing with a socket? I just did it with the little thin screw out and nothing came out, just started over heating again. Link to comment Share on other sites More sharing options...
comancheman Posted April 9, 2008 Share Posted April 9, 2008 u gotta take out the whole thing Link to comment Share on other sites More sharing options...
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