94YJ overheating?
 

Within the past few days I've noticed the temp gauge has gone up to about
250 and fluxuates between there and 235. The engine overheating light has
not come on and there seems to be no other problems. There is abundant
coolant and everything else seems fine. Is this a thermostat or possible
water pump problem?
Thanks
H-S-F

Re: 94YJ overheating?
 

help-slip-franklin wrote:
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F

thermal fan clutch? Replacing that in my TJ solved my problem.

I also cleaned all the oily goop off the fan when I had it off.
All that extra weight causes the fan to become unbalanced
killing the bearings in the water pump and fan clutch.

Look for streaks going outward from the center of the fan.

Re: 94YJ overheating?
 

help-slip-franklin wrote:
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F

thermal fan clutch? Replacing that in my TJ solved my problem.

I also cleaned all the oily goop off the fan when I had it off.
All that extra weight causes the fan to become unbalanced
killing the bearings in the water pump and fan clutch.

Look for streaks going outward from the center of the fan.

Re: 94YJ overheating?
 

help-slip-franklin wrote:
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F

thermal fan clutch? Replacing that in my TJ solved my problem.

I also cleaned all the oily goop off the fan when I had it off.
All that extra weight causes the fan to become unbalanced
killing the bearings in the water pump and fan clutch.

Look for streaks going outward from the center of the fan.

Re: 94YJ overheating?
 

help-slip-franklin wrote:
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F

thermal fan clutch? Replacing that in my TJ solved my problem.

I also cleaned all the oily goop off the fan when I had it off.
All that extra weight causes the fan to become unbalanced
killing the bearings in the water pump and fan clutch.

Look for streaks going outward from the center of the fan.

Re: 94YJ overheating?
 

help-slip-franklin wrote:
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F

Seeing a fellow DH, I have to ask if your coolant moves across the top
of your radiator when you take the cap off then let it warm up. You
may have to rev the engine a bit to see this. The 'stat can be checked
by boiling it, but if you take it out to test it, you might as well
might as well replace it before you go 'round that bend!

Re: 94YJ overheating?
 

help-slip-franklin wrote:
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F

Seeing a fellow DH, I have to ask if your coolant moves across the top
of your radiator when you take the cap off then let it warm up. You
may have to rev the engine a bit to see this. The 'stat can be checked
by boiling it, but if you take it out to test it, you might as well
might as well replace it before you go 'round that bend!

Re: 94YJ overheating?
 

help-slip-franklin wrote:
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F

Seeing a fellow DH, I have to ask if your coolant moves across the top
of your radiator when you take the cap off then let it warm up. You
may have to rev the engine a bit to see this. The 'stat can be checked
by boiling it, but if you take it out to test it, you might as well
might as well replace it before you go 'round that bend!

Re: 94YJ overheating?
 

help-slip-franklin wrote:
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F

Seeing a fellow DH, I have to ask if your coolant moves across the top
of your radiator when you take the cap off then let it warm up. You
may have to rev the engine a bit to see this. The 'stat can be checked
by boiling it, but if you take it out to test it, you might as well
might as well replace it before you go 'round that bend!

Re: 94YJ overheating?
 

I would check the fan clutch first. If you heat up the engine, the fan
clutch gets very stiff and will stop the fan almost instantly when the
engine shuts down. If it continues to spin when hot, it is worn out.

Once off, you should not be able to make it spin with a hard finger push
when hot.

You also might want to clean the sender's connection. It is on the top
back corner of the head with a single purple wire going to it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

help-slip-franklin wrote:
>
> Within the past few days I've noticed the temp gauge has gone up to about
> 250 and fluxuates between there and 235. The engine overheating light has
> not come on and there seems to be no other problems. There is abundant
> coolant and everything else seems fine. Is this a thermostat or possible
> water pump problem?
> Thanks
> H-S-F