1990 Jeep Wrangler Overheating on hot days

1990 JEEP WRANGLER
500 MILES • 6 CYL • 4WD • MANUAL
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SPRINTER31
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Just got this vehicle and it is overheating on hot days . It seems to be worst when at higher rpms for a period of time(EX. driving on hwy)
The motor was rebuilt and carburetor was converted to howell efi kit .. Everything is new and working,,(water pump, radiator, thermostat 2nd one, good water flow at various points in system,, no leaks,,
new radiator cap,,
I am wondering if efi is making it run hotter, plus being new rebuilt and everything is tighter, if thats helping it.. The new radiator is a 2 row and seems small and has a shroud,,also replaced fan clutch and can here it engage when hot,,, what else is there?? please help,, thanks steve
Oct 12, 2009 at 3:52 PM
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CJ MEDEVAC
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Are yo
Oct 14, 2009 at 3:11 PM
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SPRINTER31
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[quote:5377710827="turddog"]Are you really overheating or just higher in OK range? 2 rows does seem small, EFI probably helps w/cooler more efficient chamber burns. Have '46 CJ2A + '77 CJ5. My 5 had cooling issues, If your thermostat is same size (56MM) swap it for a Modern ..........believe it or not...........Subaru(misspelled) stat. If you compare them, the later has a MUCH larger opening port/door than your original. If you have problem locating, Willing to dig in my crap for # I used. I think later years are all the same..................................Love, Turddog[/quote:5377710827]


It is overheating to 250 and i will try the thermostat thing although when it first overheated I took the thermostat out on the side of the road thinking that vwas it but still got hot ,,,have been thinking about upgrading to 3 row radiator,,,thanks for your response
Oct 15, 2009 at 9:19 PM
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