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Old 08-13-2010, 04:00 AM   #1
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Running Hot

My 1992 YJ is running hot. It seems to do OK driving around town but when I drive on the highway around 60-65mph it starts warming up to about the 230 range. I replaced the thermostat and temp sending unit. I am leaning toward the waterpump not keeping up. Any help would be appreciated

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Old 08-13-2010, 11:32 AM   #2
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Hey Welcome to the forum!! Here is a link to my cooling issues.
It was more of a slow speed isssue, but it may give you some ideas.

http://www.wranglerforum.com/f8/ok-t...elp-55166.html

Good luck!

T

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Old 08-13-2010, 12:22 PM   #3
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Thanks for the welcome and the link to the thread. I guess I will go to the parts store tomorrow. I think I will try the new rad. cap and O2 sensor. I think it might be running lean causing it to run hot....I guess we'll see
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Old 08-13-2010, 12:33 PM   #4
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I would think you may get a check engine light if the o2 sensor were bad, but it could be on its way out, not tripping a CEL.

If the cap/o2 don't solve your ussue try doing a coolant flush. Being almost 20 years old it may need one.

Also, won't the water pump have a peep hole that seeps coolant once the pump goes bad? I've worked on a few cars that were setup like this.
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Old 08-13-2010, 06:35 PM   #5
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Just because the weep hole is dry doesn't mean the water pump is good.
If it's the original water pump it's likely to be very tired after 18 years.
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Old 08-13-2010, 07:37 PM   #6
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You are right. Just because it is dry you can't rule it out. But there *are* other, easier, cheaper things to do besides just swapping out the water pump. I'm also not ruling it out, either.
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Old 08-13-2010, 10:16 PM   #7
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i just went through this with my new jeep and ended up putting in a bigger rad new hoses and thermostat. 70 mph down the freeway at 110 outside the motor never went over 210
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Old 08-14-2010, 12:32 AM   #8
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I have been thinking about replacing the radiator but was hoping to solve the problem without going that far. But I may not have much choice..
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Old 08-14-2010, 10:26 AM   #9
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Cooling

Sounds like air in the cooling system. When air is trapped in the system it blocks the flow of coolant.
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Old 08-14-2010, 10:32 AM   #10
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Water pump

No need to replace it, if it aint leaking or making noise(bearing), it isn't bad. Impellers don't wear out.
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Old 08-14-2010, 10:38 AM   #11
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If its a new to you Jeep I would flush the coolant too. At high speed its a coolant flow issue. 20 year old coolant or rust/scale/gunk build-up is not going to help. So flush the heck out of it until the water flowing out is clear. If it still does not work you can reuse the new coolant. Use 60/40 mix.

I am finally taking mine out on the trail today and scouting for deer/elk season to test it out running at crawling slow speeds. And flex my new lift
Hope it stays cool.....

Good luck. I know its frustrating....

T
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Old 08-14-2010, 01:20 PM   #12
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OK well Ben the water pump bearing was making noise on start up and at higher RPM. I went today and bought a new radiator, water pump, radiator cap and O2 sensor. In the mean time I pulled out the thermostat and it still runs too warm (around 220). I will see in a couple of days when all the parts come in if it's fixed. Wish me luck and thanks for all the advise.
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Old 08-15-2010, 01:22 AM   #13
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Just curious, what kind radiator did you order? Highflow waterpump?

T
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Old 08-15-2010, 09:03 AM   #14
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I say start with the Radiator flush first, and Double check the t-stat in a pan of boiling water. If problems continue then clutch on fan, then radiator.. Highly doubt its the water pump unless the pully is lose and or it is leaking coolant..
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Old 08-15-2010, 10:13 AM   #15
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Do you have a radiator fan shroud? I do not have one on my jeep and when the temp is hot outside the jeep tends to run a little hotter.

I guess soemone will ask why i don't have a shroud. The previous owner must have removed it. I didn't realize I needed it until the darn jeep overheated on a 95 degree trail ride runining in 4 low all afternoon. Had it out on trails before in cooler temps and never had an issue.
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Old 08-15-2010, 10:25 AM   #16
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Quote:
Originally Posted by yj93ben View Post
No need to replace it, if it aint leaking or making noise(bearing), it isn't bad. Impellers don't wear out.
.....mmmmmm......but after 18 years they might be corroding away......especially if you don't know the level of care the PO(s) have given the vehicle.
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Old 08-15-2010, 10:25 AM   #17
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Just curious, what kind radiator did you order? Highflow waterpump?

T
I just went to the local dealer and bought a OEM radiator and water pump. I don't do much off roading as it is a daily commuter all stock.
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Old 08-15-2010, 10:29 AM   #18
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.....mmmmmm......but after 18 years they might be corroding away......especially if you don't know the level of care the PO(s) have given the vehicle.
There is a little rust I can see from the top and the pump bearing is making a little noise so I'm not taking any chances of getting stranded.
New pump and radiator will be in tomorrow.....
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Old 08-15-2010, 10:32 AM   #19
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As long as you are tearing into it, be sure to replace the heater hoses and rad hoses. Take the opportunity as you're going to have the system drained anyway. Do it all at once and be done with it! A little peace of mind.
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Old 08-17-2010, 04:33 AM   #20
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Well I replaced the radiator and water pump today. If I was to bet money I'd say it was the radiator because It looked like it was rusting from the inside out so not much flow. The water pump impeller looked really good but the bearing was making a dragging noise. But it is running "Cool as a Cucumber" now. Interstate speed with a/c running full blast and never got over 180. I really appreciate everyones help and input.
THANKS
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Old 08-18-2010, 07:31 PM   #21
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Cool deal! Glad it worked out. Enjoy!

T

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