88 yj overheating @ idle

Hi


Need some help with fixing " overheating " problems

Have a 88 YJ with 4.2 I6

For a while now I noticed that when we hit triple digits the temp gauge is
on 210 while driving and slowly creeps up to the next line (230F ?) while
de-celerating and idling @ traffic lights.

I started with a colder t-stat (180) temp dropped to 190 driving and a
little past 210 idling

Still to high

Fan clutch showed seepage and a lot of dirt so I replaced it

Still the same

Winter came, life was good :-)

First days of triple digits came and I got sick of it.

Replaced T-Stat for 195 superstat, found a piece of broken cast (?) behind
it and pulled waterpump (2years old) off to see if it was damaged and if it
was the correct CCW one.All looked OK.

Found radiator had some build-up in it and replaced it.

Car now runs hotter then before with the 180 stat (duh) and I'm back to 210
driving and 230 idling

Several people told me a lower t-stat doesn't work because the coolant will
move to fast and doesn't have time to cool of in triple digit weather but
its runs hotter then before. I also noticed when idling the coolant almost
sits still in the radiator and starts to move a little when revving it up.

So ,what's next, im running out of stuff to try

TIA

JohanB

I read somewhere that you could do a pinch test on the hose going to the
radiator while the engine is warm. You should be able to feel/hear a woosh
when you release it if the water pump is working properly.

Belt tension may not be turning the water pump fast enough also?

Um you said your fan clutch showed seepage? I think it might be yer water
pump seeping water out? If so it need to be replaced. I think the fan
clutch you have is the coil type? I can't think of how water would seep
from this.

I'm chasing down a cooling problem on my cherokee, its acting weird so I've
been reading up on cooling issues also.

Troy

I would check the actual temperature of the coolant with a known good
temperature guage and see what you get it may be just your temperature guage
since you did not say anything about a boil over.
Coasty

"JohanB" > wrote in message
...
> Hi
>
>
> Need some help with fixing " overheating " problems
>
> Have a 88 YJ with 4.2 I6
>
> For a while now I noticed that when we hit triple digits the temp gauge
> is
> on 210 while driving and slowly creeps up to the next line (230F ?) while
> de-celerating and idling @ traffic lights.
>
> I started with a colder t-stat (180) temp dropped to 190 driving and a
> little past 210 idling
>
> Still to high
>
> Fan clutch showed seepage and a lot of dirt so I replaced it
>
> Still the same
>
> Winter came, life was good :-)
>
> First days of triple digits came and I got sick of it.
>
> Replaced T-Stat for 195 superstat, found a piece of broken cast (?) behind
> it and pulled waterpump (2years old) off to see if it was damaged and if
> it
> was the correct CCW one.All looked OK.
>
> Found radiator had some build-up in it and replaced it.
>
> Car now runs hotter then before with the 180 stat (duh) and I'm back to
> 210
> driving and 230 idling
>
> Several people told me a lower t-stat doesn't work because the coolant
> will
> move to fast and doesn't have time to cool of in triple digit weather but
> its runs hotter then before. I also noticed when idling the coolant almost
> sits still in the radiator and starts to move a little when revving it up.
>
> So ,what's next, im running out of stuff to try
>
> TIA
>
> JohanB
>
>
>
>
>
>
>
>

Hmmm...

Does your 4.2 have the odd ball setup with a serpentine belt? If not,
the waterpump is supposed to spin clockwise on a V-belt engine..... The
serpentine belts on the 4.0 use the reverse rotation pumps.

210 to 230 is 'normal' for operating temperature with a 15 lb cap and a
50/50 coolant mix. The 50/50 mix is good up to about 265 deg. 190
while driving is almost too cold, it should be at least 210.

The temperature gauges are 'not' known to be accurate.

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)

JohanB wrote:
>
> Hi
>
> Need some help with fixing " overheating " problems
>
> Have a 88 YJ with 4.2 I6
>
> For a while now I noticed that when we hit triple digits the temp gauge is
> on 210 while driving and slowly creeps up to the next line (230F ?) while
> de-celerating and idling @ traffic lights.
>
> I started with a colder t-stat (180) temp dropped to 190 driving and a
> little past 210 idling
>
> Still to high
>
> Fan clutch showed seepage and a lot of dirt so I replaced it
>
> Still the same
>
> Winter came, life was good :-)
>
> First days of triple digits came and I got sick of it.
>
> Replaced T-Stat for 195 superstat, found a piece of broken cast (?) behind
> it and pulled waterpump (2years old) off to see if it was damaged and if it
> was the correct CCW one.All looked OK.
>
> Found radiator had some build-up in it and replaced it.
>
> Car now runs hotter then before with the 180 stat (duh) and I'm back to 210
> driving and 230 idling
>
> Several people told me a lower t-stat doesn't work because the coolant will
> move to fast and doesn't have time to cool of in triple digit weather but
> its runs hotter then before. I also noticed when idling the coolant almost
> sits still in the radiator and starts to move a little when revving it up.
>
> So ,what's next, im running out of stuff to try
>
> TIA
>
> JohanB

What Mike said. If you are not boiling over, then you are OK. It is
actually better to run hot, so you burn impurities out of your oil. See the
"Old Jeep drivers beware!" thread for a discussion of the evils of sludge,
and how to avoid them. That old wive's tale about the coolant moving too
fast to transfer heat has no basis in physical reality.

Earle

"JohanB" > wrote in message
...
> Hi
>
>
> Need some help with fixing " overheating " problems
>
> Have a 88 YJ with 4.2 I6
>
> For a while now I noticed that when we hit triple digits the temp gauge
is
> on 210 while driving and slowly creeps up to the next line (230F ?) while
> de-celerating and idling @ traffic lights.
>
> I started with a colder t-stat (180) temp dropped to 190 driving and a
> little past 210 idling
>
> Still to high
>
> Fan clutch showed seepage and a lot of dirt so I replaced it
>
> Still the same
>
> Winter came, life was good :-)
>
> First days of triple digits came and I got sick of it.
>
> Replaced T-Stat for 195 superstat, found a piece of broken cast (?) behind
> it and pulled waterpump (2years old) off to see if it was damaged and if
it
> was the correct CCW one.All looked OK.
>
> Found radiator had some build-up in it and replaced it.
>
> Car now runs hotter then before with the 180 stat (duh) and I'm back to
210
> driving and 230 idling
>
> Several people told me a lower t-stat doesn't work because the coolant
will
> move to fast and doesn't have time to cool of in triple digit weather but
> its runs hotter then before. I also noticed when idling the coolant almost
> sits still in the radiator and starts to move a little when revving it up.
>
> So ,what's next, im running out of stuff to try
>
> TIA
>
> JohanB
>
>
>
>
>
>
>
>



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