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"Scott" <scott@tatewise.com> wrote in message
news:pAISa.9560$Je.879@fed1read04...
> 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.
>
>

Are you absolutely sure the water pump is turning the right way? It is quite
common for the parts stores to supply the wrong one. Also check your hoses
to make sure they are up to snuff and not able to collapse. The other thing
I would check is that there is no air in the system. I know these are
basics, and maybe you have checked already.

Chris