Temp ?

[pianoguy]

My temp goes over 210 not by much, only when the outside temp is 90 and over and only when I am on the highway in 5th gear.

It has never done this before. Is it?

A. coolant
B. Old radator (12 year old)
C. water pump
D. Other???

[JeepFan555]

I would assume it is the radiator but that would be me assuming

[Tooch]

If it were the coolant it would happen all the time, same with the water pump. If i had to guess, I would agree with Jeepfan555 and say it's the radiator. But, it wouldn't hurt to try to flush it and try it again.

[XfaCtoR]

get a hydromider and test the coolent..you may just need a flush and refill with the right mix

[bluerocket]

My jeeps electric cooling fan dosent kick in untill 220. But If this is abnormal for yours, Pressure wash the radiator to get any mud out of it (common cause of overheating) Make sure the radator is in good shape. If there is a radiator cap replace it. I would drain and refill the coolant for good mesure, its onl $20 if you do it yourself.

[XfaCtoR]

coolent will go bad ,just draining your radiator isnt enough...theres still a good about of coolent in the rest of the system.your best bet is to take the upper hose and run it. colecting all the coolent that comes out..once the thermista opens it wont take long to flush. just keep the radiator full of water then you do it. when it all comes out clean refill the system with the right mix.

[bluerocket]

Doing it that way you will have water left in the block, which makes getting the right mixture a guessing game if I am not mistaken.

[sidriptide]

bluerocket said:

Pressure wash the radiator to get any mud out of it (common cause of overheating) .

bad idea... you can do alot of damage to the cooling fins with pressure like that. a garden hose flowing from the reverse direction of the airflow will take a lil more time but wont damage anything.

what are the specifics of the rig anyways? model/engine/etc.. cooling issues vary greatly from one model and year to another.

your problem sounds like what my 2.5L YJ does. it doesnt like my "foot-on-the-floor-just-to-run-with-traffic " style of driving.. it needs a radiator pretty badly.

[slab42]

don't pressure wash the radiator up close! and you can't really get to the back with the pressure washer (been there!) without getting too close. I bent some fins on the back that way on my old radiator. the best way I found was tohave the engine running, and hood open, and spray the pressure washer from about 3 feet away from the jeep at the front of the radiator. the fan should help pull the water through, and since you are farther away, you should not damage anything, and the spray will be spread out enough to soak the radiator good. If the problem still persists, remove the radiator, and use an air chuck to blow out the mud (while dry of course). that worked real well for me also! After doing cleaning mud out of my radiator a few times, I have talked it over with the jeep, and we both agree that we should not allow large amounts of mud in the radiator again!... oh yeah, and I got a 3 core radiator to replace the beat up one! www.radiator.com real cheap!

[jps4jeep]

I am gonna go the route of radiator, I know his jeep has some where in the well over 220,000 milage rage ( I think he has 260K?) and it is a 9? YJ. Is it the original radiator?

Mile blew up at 89K miles.

[mprayii]

what are jeeps normally running at? mine has always seemed to run at the 210 mark, (thats right in the middle right?) 2000 tj 4.0 in case you were wondering.

[Tooch]

That's around where mine usually runs, but I'm running an 04 Rubicon and I just assumed a 93 ran at a cooler tempature.

[pianoguy]

I have read that the 4.0 should run at 190.

I am also thinking radiator. But think I am going to hold off for now. I runs under 190 while 4wheeling and around town.

I'm thinking save the money and buy the springs from John!!!

[jps4jeep]

offer is still there, most MPFI (Multi point fuel injected)engines run best at 210, that is the standard for motors essentially built after 1988~1992. Most MPFI motors will accually run worse when the T-stat is replaced with a colder unit. (170-180 range) If you are running a consistant 190* in the 93 YJ, that is on the cold side, your clutch fan might be stuck in the locked position, not a bad thing, unless it gets stuck in the not-locked position.