Question for you.

Was it running before you did this work on the rad and waterpump?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Scott wrote:
>
> Guys,
> I just bought a new custom radiator for my 90 YJ. The YJ has a 1994
> Corvette LT1 in it, so I guess this makes this question a bit off topic.
> But, Bill ------ is always listening. :) LOL. In any event, after
> installing this monster aluminum radiator, the jeep seems to exibit some
> strange behavior. When you sit at idle, the electric fan keeps the
> temperature down. But, if you go ANYWHERE, the temp rises immediately. I
> can't even make it a mile without it going up to 235+. In any event, I've
> just (at the same time) put a completely new thermostat (180 degrees) and
> new water pump on the engine. But, the behavior almost seems like what
> would happen if the water pump just weren't pumping. Since the cooling
> system is the reverse flow, it is difficult to tell if the pump is pumping
> at expected rates. Is there a test to make sure that it is? Bill, anyone,
> any thoughts? It is a pretty defeating feeling after spending that much
> money on a radiator, SPAL fan, water pump, thermostat, and a bunch of
> gaskets. Any suggestions are appreciated.
> TIA.
> Scott
>
> FYI, it's a 90 wrangler with a 94 LT1. The new radiator is a custom build
> from Ron Davis Radiators. The electric fan is a SPAL high flow fan. There
> is a custom shroud on it too.

 

Yes. It was running. The original radiator was a 3 core that was a bit too
small. So, when I hit it hard, it would slowly get warm (but only when it
was 100+ outside). Now, it's a disaster. Did you read what Bill said about
the thermostat? Is that true? Wierd stuff huh. Amazing how it could go
from ok to disaster so fast. Any ideas?

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F1BF1CD.637D92D0@sympatico.ca...
> Question for you.
>
> Was it running before you did this work on the rad and waterpump?
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Scott wrote:
> >
> > Guys,
> > I just bought a new custom radiator for my 90 YJ. The YJ has a 1994
> > Corvette LT1 in it, so I guess this makes this question a bit off topic.
> > But, Bill ------ is always listening. :) LOL. In any event, after
> > installing this monster aluminum radiator, the jeep seems to exibit some
> > strange behavior. When you sit at idle, the electric fan keeps the
> > temperature down. But, if you go ANYWHERE, the temp rises immediately.
I
> > can't even make it a mile without it going up to 235+. In any event,
I've
> > just (at the same time) put a completely new thermostat (180 degrees)
and
> > new water pump on the engine. But, the behavior almost seems like what
> > would happen if the water pump just weren't pumping. Since the cooling
> > system is the reverse flow, it is difficult to tell if the pump is
pumping
> > at expected rates. Is there a test to make sure that it is? Bill,
anyone,
> > any thoughts? It is a pretty defeating feeling after spending that much
> > money on a radiator, SPAL fan, water pump, thermostat, and a bunch of
> > gaskets. Any suggestions are appreciated.
> > TIA.
> > Scott
> >
> > FYI, it's a 90 wrangler with a 94 LT1. The new radiator is a custom
build
> > from Ron Davis Radiators. The electric fan is a SPAL high flow fan.
There
> > is a custom shroud on it too.

 

Do you still have your original water pump? From your description of what
happens you have the wrong one on the engine now.

Earle

"Scott Tate" <scott@tatewise.com> wrote in message
news:WETSa.9913$Je.8895@fed1read04...
> Yes. It was running. The original radiator was a 3 core that was a bit
too
> small. So, when I hit it hard, it would slowly get warm (but only when it
> was 100+ outside). Now, it's a disaster. Did you read what Bill said
about
> the thermostat? Is that true? Wierd stuff huh. Amazing how it could go
> from ok to disaster so fast. Any ideas?
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F1BF1CD.637D92D0@sympatico.ca...
> > Question for you.
> >
> > Was it running before you did this work on the rad and waterpump?
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Scott wrote:
> > >
> > > Guys,
> > > I just bought a new custom radiator for my 90 YJ. The YJ has a
1994
> > > Corvette LT1 in it, so I guess this makes this question a bit off
topic.
> > > But, Bill ------ is always listening. :) LOL. In any event, after
> > > installing this monster aluminum radiator, the jeep seems to exibit
some
> > > strange behavior. When you sit at idle, the electric fan keeps the
> > > temperature down. But, if you go ANYWHERE, the temp rises
immediately.
> I
> > > can't even make it a mile without it going up to 235+. In any event,
> I've
> > > just (at the same time) put a completely new thermostat (180 degrees)
> and
> > > new water pump on the engine. But, the behavior almost seems like
what
> > > would happen if the water pump just weren't pumping. Since the
cooling
> > > system is the reverse flow, it is difficult to tell if the pump is
> pumping
> > > at expected rates. Is there a test to make sure that it is? Bill,
> anyone,
> > > any thoughts? It is a pretty defeating feeling after spending that
much
> > > money on a radiator, SPAL fan, water pump, thermostat, and a bunch of
> > > gaskets. Any suggestions are appreciated.
> > > TIA.
> > > Scott
> > >
> > > FYI, it's a 90 wrangler with a 94 LT1. The new radiator is a custom
> build
> > > from Ron Davis Radiators. The electric fan is a SPAL high flow fan.
> There
> > > is a custom shroud on it too.
>
>

 

Earle,
is it possible to put the wrong one on? The water pumps are 100%
identical in every way.
Scott

"Earle Horton" <enfermero_diabolico@registerednurses.com> wrote in message
news:bfh30b$elo91$1@ID-147790.news.uni-berlin.de...
> Do you still have your original water pump? From your description of what
> happens you have the wrong one on the engine now.
>
> Earle
>
> "Scott Tate" <scott@tatewise.com> wrote in message
> news:WETSa.9913$Je.8895@fed1read04...
> > Yes. It was running. The original radiator was a 3 core that was a bit
> too
> > small. So, when I hit it hard, it would slowly get warm (but only when
it
> > was 100+ outside). Now, it's a disaster. Did you read what Bill said
> about
> > the thermostat? Is that true? Wierd stuff huh. Amazing how it could
go
> > from ok to disaster so fast. Any ideas?
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3F1BF1CD.637D92D0@sympatico.ca...
> > > Question for you.
> > >
> > > Was it running before you did this work on the rad and waterpump?
> > >
> > > Mike
> > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > 88 Cherokee 235 BFG AT's
> > >
> > > Scott wrote:
> > > >
> > > > Guys,
> > > > I just bought a new custom radiator for my 90 YJ. The YJ has a
> 1994
> > > > Corvette LT1 in it, so I guess this makes this question a bit off
> topic.
> > > > But, Bill ------ is always listening. :) LOL. In any event, after
> > > > installing this monster aluminum radiator, the jeep seems to exibit
> some
> > > > strange behavior. When you sit at idle, the electric fan keeps the
> > > > temperature down. But, if you go ANYWHERE, the temp rises
> immediately.
> > I
> > > > can't even make it a mile without it going up to 235+. In any
event,
> > I've
> > > > just (at the same time) put a completely new thermostat (180
degrees)
> > and
> > > > new water pump on the engine. But, the behavior almost seems like
> what
> > > > would happen if the water pump just weren't pumping. Since the
> cooling
> > > > system is the reverse flow, it is difficult to tell if the pump is
> > pumping
> > > > at expected rates. Is there a test to make sure that it is? Bill,
> > anyone,
> > > > any thoughts? It is a pretty defeating feeling after spending that
> much
> > > > money on a radiator, SPAL fan, water pump, thermostat, and a bunch
of
> > > > gaskets. Any suggestions are appreciated.
> > > > TIA.
> > > > Scott
> > > >
> > > > FYI, it's a 90 wrangler with a 94 LT1. The new radiator is a custom
> > build
> > > > from Ron Davis Radiators. The electric fan is a SPAL high flow fan.
> > There
> > > > is a custom shroud on it too.
> >
> >
>
>

 

Hi Earle,
The LT1 uses a unique water pump and thermostat, pictured:
http://www.thunderracing.com/index.c...ategoryid=1037
Scott, could have easily bought an electric pump designed to circulate
the coolant in the opposite direction as in regular Chevy.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Earle Horton wrote:
>
> Afaik, the difference is in rotation and the impeller would look different.
> If you still have the old pump though, put it on and make absolutely sure
> the new pump is not at fault. When you are faced with a mechanical assembly
> that refuses to play by the rules, you have to proceed methodically. One
> step at a time. Pain in the neck...
>
> Thermostat in the right way?
>
> Earle

 

Bill, someone removed the expansion tank for the rad fluid that hooks up
to the rear of the heads, the one that allows the air to come out of the
heads thinking it was a 'closed' system tank like on an XJ.

He sure could be describing air locked heads.

Could also be why the old setup ran hot. The previous owner must have
opened the plugs on the heads to purge the air out and maybe left a bit
of air in there.

Mike

"L.W.(ßill) ------ III" wrote:
>
> Hi Earle,
> The LT1 uses a unique water pump and thermostat, pictured:
> http://www.thunderracing.com/index.c...ategoryid=1037
> Scott, could have easily bought an electric pump designed to circulate
> the coolant in the opposite direction as in regular Chevy.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Earle Horton wrote:
> >
> > Afaik, the difference is in rotation and the impeller would look different.
> > If you still have the old pump though, put it on and make absolutely sure
> > the new pump is not at fault. When you are faced with a mechanical assembly
> > that refuses to play by the rules, you have to proceed methodically. One
> > step at a time. Pain in the neck...
> >
> > Thermostat in the right way?
> >
> > Earle