Have an 87 YJ with the 2.5 .
The temp gauge is saying that it's running at 220 degress. I've
replaced the radiator and thermastat twice and all new hoses.
The hoses will be hot but the cap will not be. The water pump is not
leaking
It's also leaking some where at the bottom but can see where. When i
take the shroud off there is no leak. I'm at the end of my rope with
this. Any ideas would be very help full . Thanks,

Later Mike

The first thought is that the gauge is not reading correctly. Does the
temp move much from the indicated 220 degrees when sitting in traffic
after going down the freeway? Or start climbing steadily on a hot day on
the freeway? If not, I'm not too worried.

With a proper 192 degree thermostat, the engine should be running at
around 200 to 210 degrees. They used some fairly cheap and inaccurate
gauges in those years. (The oil sender is the worst by far.)You can buy
a cheap meat thermometer, tape it to the thermostat housing, and wrap it
with mutiple layers of rags to insulate it as a quick and dirty test.
Expect it to read about 10 degrees lower than the liquid inside.

www.harborfreight.com has several non contact thermometers starting at
$10. Never used one, can't comment on how accurate they are.
http://www.harborfreight.com/cpi/cta...emnumber=93983

The leak might be in the overflow system, it would drain out of the tube
or aroudn the neck, down the shroud, collect in the bottom. Try a new
cap, replace the overflow hose.

If it really is running hot, your water pump may have erroded vanes from
caviation over the years. Not sure of the 2.5 but the 4.2L water pump on
a V belt driven engine rotates the reverse direction from a serpentene
belt system. People have reported getting the wrong pump, fits fine,
doesn't pump so fine.

Mike chambers wrote:

Thanks for the help.It does just go to 220 and just stops . No going
over and drops down a little. We have lazer thermator at work i'm going
to try tonight. I went and retighted every thing and it no leaks. I'll
just drive it till it breaks . I am going to pick up an after market
gauge to see if thats the reproublem. Just had my fill of working on it
for the last month.
Thanks again for the help.

Later Mike

Get the jeep up to full operating temp (at least 15 minutes) on a warm
day. Shut the engine off, check to see if the fan blade can be turned.
It should be locked solid or at least quite firmly to the water pump
shaft. After it cools down, it should spin freely.

Mike chambers wrote:

Thanks for the help . I'll try it on Saturday and see what happens.

Later Mike