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Old 04-09-2010, 09:40 PM   #1
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Question 1990 yj over heats 60+

I have a 1990 yj I4, that will run about 190 degrees from idle to 55 or 60. But when I start running 60 or more(Note anything over 60 is because I'm going downhill with an tail wind) LOL! the engine starts to over heat. This is after I have removed the thermostat and installed a new radiator. Is this the norm for the 4 banger.

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Old 04-09-2010, 09:49 PM   #2
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no, and you need a thermostat, an engine can overheat without one, believe it or not. secondly, the 4 banger needs the fan shroud, make sure the top and bottom of the shroud is there and not missing.

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Old 04-09-2010, 10:28 PM   #3
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OK! I'll put the thermostat back in. The shroud is there and it looks correct. I'll let you know what happens after I replace the thermostat. Thanks James H.
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Old 04-09-2010, 10:35 PM   #4
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obviously you might as well put a new thermostat in, and not the old one, but i assume thats whats going on.
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Old 04-10-2010, 12:50 AM   #5
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The water pump may be going.
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Old 04-11-2010, 12:05 PM   #6
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Check the fan clutch
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Old 04-11-2010, 10:17 PM   #7
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Thanks

This one dos not have a fan clutch.
Thanks !
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Old 04-11-2010, 10:19 PM   #8
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a 4cyl without a fan clutch, i hope you have electric fans, and not some crappy flex fan or something crazy. if thats the case, get a fan clutch and normal set up.
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Old 04-11-2010, 10:20 PM   #9
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The water pump does not leak nor do I hear any noise from it. Is there any way to check it? or is it just replace it and see?
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Old 04-11-2010, 10:22 PM   #10
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Yes, I was planing on putting a new thermostat in it.
Thanks for reminding me!
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Old 04-11-2010, 10:25 PM   #11
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This one came this way. What is the difference between having a fan clutch or not. I really don't know, not trying to be funny.
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Old 04-11-2010, 10:28 PM   #12
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well, what does it have if it doesn't have a fan clutch? you can't check for a worn water pump without removing it, and then knowing what a worn one looks like. the fins can get worn, or broken then not pump enough to cool the engine.
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Old 04-11-2010, 10:40 PM   #13
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Clutch Fan or not

It just has a fan bolted to the water pump. I don't know if it is stock or not. If the fan works all the time with a over heating issue, that seems like a good thing. How will a clutch fan work better then that? I'am not trying to be funny or anything like that. I truly don't see the difference.
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Old 04-13-2010, 09:40 PM   #14
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The fan blades are mounted to a viscous fan clutch and then this assembly is bolted to the water pump. The fan clutch has a spring coil in it that is temp sensitive and automatically increases or decreases fan speed to provide proper engine cooling at various engine speeds. Without describing it's entire function, it is designed to limit the fan speed to a predetermined max level at higher engine speeds. If it is defective it could be limiting the fan speed too much. I had the same problem last summer that you described and it was the fan clutch.

To test the water pump, look for obvious signs of coolant leaks. Usually a coolant leak is a sure sign of a defective water pump. You can also try and grab the fan blade and fan clutch assembly and see if the shaft going into the water pump moves left or right. The shaft shouldn't move. If it does the bearings in the water pump are shot. In which case, you'll probably see coolant leaking anyway.

Hope this helps. Good luck. Oh, don't forget to put in that thermostat. :-)
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Old 04-13-2010, 09:50 PM   #15
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Oh yeah, I forgot to ask, are you sure you don't have a fan clutch? It is a circular thing that the fan blades are bolted to and then the fan clutch assembly is bolted to the shaft of the water pump. It sometimes looks like it is only a fan.
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Old 04-13-2010, 09:51 PM   #16
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i'm thinking he has a fan clutch and just doesn't know what it looks like. i just want to make sure it doesn't have a stupid flex fan or anything.
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Old 04-14-2010, 12:22 AM   #17
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A pic of a fan clutch, It's the aluminum looking saucer that is bolted to the fan itself. Bout the size of a well dressed torta, you being from AZ should know what a torta is, almost as yummy as a Sonora style bacon wrapped hot dog

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Old 04-17-2010, 01:28 AM   #18
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Thanks you! I do not have a fan clutch, I ordered one and it will be in tomorrow. My jeep does have a flex fan blade on it. I can't find a stock Fan blade anywhere so far. When I install the fan clutch, I'am going to reuse the flex fan blade until I can find one somewhere. Thanks again for the help!
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Old 04-17-2010, 08:22 AM   #19
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i would not use the fan clutch with the flex fan

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