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
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
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.....
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.
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..
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.
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.
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.