Overheating cause ID'ing
#1
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Year: 1998
Model: Cherokee
Engine: 4.0L, 178k miles
Overheating cause ID'ing
Hey everyone, did a few searches and can't seem to nail down my problem. I'll describe it as best as I can.
Things to keep in mind:
1998 Cherokee Sport, 4.0, Auto Trans ~178k miles. Bypassed heater core, new water pump and thermostat (<1.5 months)
My engine is overheating pretty bad. Here's how my heater core bypass is set up: Connected two lengths of heater hose to the two pipes on the heater core, no problems there. Connected 2 feet of 5/8" hose to 2 feet of 3/4" hose with a 5/8" to 3/4" step up connector from Napa. No kinks, all hoses secured with screw on hose clamps. My engine was running perfectly normal before the water pump rerouting coupler that I used blew apart due to a kink
Now, after replacing all necessary hoses and couplers + hose clamps, the engine will run for a few minutes at (reported) normal temperature, then all of a sudden will begin to bog down and overheat. Overheating happens about 15 minutes after starting at idle, about 5 minutes after city driving when warmed up. I've topped off the coolant after blowing the hose, and my oil shows no signs of milkiness. There is a little bit of sediment on the lip of the radiator cap opening, but I have no way of knowing if this is the original radiator. I'm going to attempt to flush it tomorrow before I go away for a few days, but does anyone know of a most-likely scenario as to why I'm overheating?
Thanks for anything you can think of.
Things to keep in mind:
1998 Cherokee Sport, 4.0, Auto Trans ~178k miles. Bypassed heater core, new water pump and thermostat (<1.5 months)
My engine is overheating pretty bad. Here's how my heater core bypass is set up: Connected two lengths of heater hose to the two pipes on the heater core, no problems there. Connected 2 feet of 5/8" hose to 2 feet of 3/4" hose with a 5/8" to 3/4" step up connector from Napa. No kinks, all hoses secured with screw on hose clamps. My engine was running perfectly normal before the water pump rerouting coupler that I used blew apart due to a kink
Now, after replacing all necessary hoses and couplers + hose clamps, the engine will run for a few minutes at (reported) normal temperature, then all of a sudden will begin to bog down and overheat. Overheating happens about 15 minutes after starting at idle, about 5 minutes after city driving when warmed up. I've topped off the coolant after blowing the hose, and my oil shows no signs of milkiness. There is a little bit of sediment on the lip of the radiator cap opening, but I have no way of knowing if this is the original radiator. I'm going to attempt to flush it tomorrow before I go away for a few days, but does anyone know of a most-likely scenario as to why I'm overheating?
Thanks for anything you can think of.
#3
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Join Date: May 2013
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Year: 1998
Model: Cherokee
Engine: 4.0L, 178k miles
Edit: I'm looking on a few sites that sell radiators and some have them listed with the heavy duty cooling option. Is that part of a towing package?
Last edited by samj; 07-22-2013 at 05:34 PM.
#4
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Year: 1998
Model: Cherokee
Engine: 4.0L, 178k miles
So after giving it another look it seems that I still had to add another two gallons of coolant to the reservoir tank. No issues with overheating now but I'll keep the radiator under a microscope in the future. This thread's done!
#7
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Year: 1998
Model: Cherokee
Engine: 4.0L, 178k miles
Yeah, 50/50 premix is what I used. Pretty insane amount...but now my transmission is slipping (I think) so I'll have plenty to play with next week...
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