Do you have a fan clutch? If so, replace it. Mileage is about right for
one of these to fail.

How is your electric fan controlled? Is it switching on when it is supposed
to? I have an electric fan in my 2.5 liter Wrangler which I have set to
come on at 215º F, but I use it for mostly highway use and no AC.

Earle

"Craig" <cwhitacre21@***.net> wrote in message
news:j4FRa.55899$o86.13947@news1.central.***.net.. .
> Hi,
>
> What do I check for overheating 2.5L, 86 Comanche with AC, powersteering?
> I've changed fluids, thermostat, added electric fan, new radiator cap, and
> water pump?
>
> Water boils into my overflow bottle and red idiot light comes on. Engine
> trys to die when I push in the clutch. Engine starts fine and seems to
have
> normal power for a 2.5. But I can't run for more than 30 minutes or so
with
> AC on before it overheats.
>
> Truck has 129k miles and is in great condition otherwise.
>
> Thanks,
>
> Craig W.
> 86 Comanche
> 02 Wrangler Sport
>
>