Vehicle & Technical > Jeep

newbie quick jeep question

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EvilEd:
Back on track... ;) (Unlike me)

she should sit at 100 almost all the time. If she's overheating under load, then check.....
obviously coolant level.
Coolant Mix (50/50)
VC fan is working (Should be stiff to turn with the engine off when cold! they do fail - obviously don't shove your hand in a moving fan!)
after that, you're looking at the water pump being slow/worn or crud in the system.

This is assuming you don't offroad her and the rad isn't full of mud.

skip:
Evil Ed you forgot one thing, :?  The condition of the rad itself, more than likley the rad on a 9-10 year old motor could do with a blow through or a recore.

ben.williamson:
so is this normal my jeep has 153k miles on it i think at some point there has been a replacemt rad from a scrap yard (it has jeep 1998 written on in white pen of some kind )

ben.williamson:
another quick point is that i only got the jeep end of september drove it home around 30miles on the way home it ran at around 101/2 degrees all the way on a road 60mph the next day or so it went offroading i can't remember if this is before or after the first over heat . but after that hapended i found the wire that links the electric fab to the engine had come apart so joined that back together

the main thing is that i think the system has to be set up by bleeding it or somthing and i haven't as yet its been sat in my garden for around two weeks i don't want to wreak it or similar and this sunday tomorow i'm meant to be going to manby motorplex offroad corse 10th dec with my club lincs offroad

as it happens manby is 1 mile from my house i'll just have to keep an eye on it temp gauge

cheers ben

skip:
4.0 ltds are a bit marginal on cooling, so the system needs to be in top condition to avoid overheating under extreme conditions such as off roading. The main cooling fan really shifts some air when it's going properly, enough to blow dust eveywhere on dry gravel tracks. The electric fan is there primarily for the aircon, the ECU will also bring it on if the temp goes over 110 degrees I think, around 3/4 on the guage anyway. on normal road conditions it should not be coming on, not this time of year.

Jeeps tend to burp them selves, if you are going to have problems it will be when off roading as constant low revs means minimal cooling, expect the electric fan to come on after a while, I've had mine a hairs width away from the red when my rad was blocked, the old girl survived ok. a recore was £145. alot cheaper than a new rad at around £300.  

I see alot of cherokees for sale cheap with a blown head gasket. I think this is more likley to be a blocked rad causing overheating. blown head gaskets on all cast iron engines don't happen very often.

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