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ellabean3
New User
| Posts: 1
| Joined: 08/06
Posted: 08/13/06
03:36 AM
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My 1987 Jeep Cherokee with 67,000 miles is overheating. Have replaced the theromstat, and that did not solve the problem. When left to idle I can see the coolant bubbling up in the coolant reservoir, and it will overheat. Anybody have any ideas? Thanks.
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Posted: 08/13/06
04:45 PM
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flush your system really good .. drain everything fill with a good flush kit *about 7 or 8 bucks from wal-mart* crank heater wide open run for 10 mins or so let cool, drain ... then leave drain open remove your thermo and connect back the housing then stick your garden hose in your radiator fill crank heater wide open and let your engine run a few mins about 5-10 depending on how much crap flows out run it until it runs fairly clear cut off finish flushing with hose ... then cork everything up put back in your thermo and refil with a 50/50 mix ... if that dont cure it your clutch fan is on the blink
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Posted: 08/15/06
05:57 AM
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Need a little more imput to diagnose.
Is cooling fan comeing on ok?
Does vehicle stay cool when driving on open highways?
Do you still have original radiator in vehicle. If so'flush out as mentioned above and if that doesn,t work' your radiator may need replacement.
Also 1st. be sure water pump is doing its thing. In otherwords is coolant circulateing ok in system. ( Good Pressure)
Replace radiator pressure cap if old one.
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Posted: 08/15/06
06:02 AM
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Helpful
Helpful Follow Up
Why does my rig overheat?
XJ's are notorious for overheating. From early years until the early 90's they came with a "closed" cooling system. When functioning properly, these systems should perform fine. "Open" systems, on later model XJ's, are just like most typical cooling systems (filler cap on radiator, etc).
Several things can cause overheating…
1) Bad thermostat (it may stick and not allow the engine to cool)
2) Bad electric fan motor or sensor (this should kick on once the vehicle reaches 220 degrees, if it doesn't…it's bad)
3) Bad clutch fan (this is designed to spin on a clutch system, if it fails you will overheat in the city very quick)
4) Bad radiator (plugged or broken fins will cause an XJ to overheat)
5) Plugged coolant passages in the engine block. (typically manifested by highway overheating
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