Overheating problems?
#1
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Year: 96
Model: Cherokee
Engine: 4.0HO
Overheating problems?
Ok i have a 96 xj, new thermostat, new electric fan, new clutch fan, fresh coolant flush. When cruising in town or at idle it doesnt run hot about 210, but as soon as i hit highway 70-75mph or hit the slightest incline it runs up about 240ish-250, im puzzled any help would be appreciated. Thanks
#3
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Year: 1992
Model: Cherokee
Engine: 4.0 liter I6
Water pump? But sounds like a fan clutch issue. Could be at the higher rpms the water pump is failing and you arent getting proper flow. I have come to learn that these cooling systems dont follow traditional rules for diagnosis. Maybe a radiator cap too. Since at higher RPMs there is more flow and maybe more pressure? I dunno really parts are generally cheap, so I would go with the shotgun approach and and throw everything at it.
Last edited by thakmfb; 04-16-2012 at 09:58 PM.
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#12
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Year: 96
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So update, replaced the Rad, water pump, 180 tstat, new hoses, new clutch fan, new elec fan and still having overheating issues, fresh flush and all
#13
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Just for giggles, check the temperature at your thermostat housing with an IR thermometer.
I wonder if your gauge sender is non-linear at higher temps, causing it to read wrong?
How's the engine running? Sometimes fuel or timing problems can make engines run too hot. Fuel starvation causing a too-lean condition at high RPM isn't unheard of. Taping a fuel pressure gauge up where you can see it while driving sometimes is interesting.
A partially obstructed Cat is another possibility, which the '96 had big problems with. (There is still an active campaign on them)
I wonder if your gauge sender is non-linear at higher temps, causing it to read wrong?
How's the engine running? Sometimes fuel or timing problems can make engines run too hot. Fuel starvation causing a too-lean condition at high RPM isn't unheard of. Taping a fuel pressure gauge up where you can see it while driving sometimes is interesting.
A partially obstructed Cat is another possibility, which the '96 had big problems with. (There is still an active campaign on them)
Last edited by Radi; 06-15-2012 at 10:04 PM.
#14
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Year: 96
Model: Cherokee
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See i was thinking the same thing cause i have seen the gauge at 250ish and it wasnt boiling off any coolant or anything? but still seemed warm when i popped the hood
#15
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Year: 96
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And just a random thought i was having, maybe pulling around those 33's on the stock 3.55's maybe its alot of load on it, but didnt know?