Good morning all. I have a 94 LT1 and I am thinking about installing a
Dewitts radiator. Before I jump in and spend $500.00 bucks, is this considered a good investment? Also, all other things being normal, what kind of temps could I expect running around on the streets? I have a 165 degree stat and hypertech controlling the fans.
Any help would be greatly appreciated.

Thanks much

Dray

 

I installed a Dewitts along with an electric water pump. My temps stay in the 185 degree range now. In traffic, they may rise to 195, but as soon as I start moving, they drop back down. For comparison, my stock radiator and water pump ran 20-25 degrees hotter in the same conditions.

 

I have one, my traffic temperatures are basically what they were before, however when the car gets moving the temperatures come down much faster, and will equilibrate at about 10F below what they were beforehand.

 

I say GO FOR IT!

 

I installed one in my 1993 LT1, as well as a meziere electric water pump, and a fan switch to keep both fans on when I flip a switch.
Keep in mind I live in Germany and drive on the autobahn, and hit 140-150 MPH on the way to work daily. I have also driven the car 2000 miles in the past month to test out the new components.
The car has kept things at 180-190 F when cruising below 100 MPH, and at about 195-201 F when 100-150 MPH. I do notice that the engine heats up quite a bit when I slow down from those speeds to city driving speed, but they drop fairly quickly once I flip on the fan switch after initially spiking up to 220 F.

Keep in mind that they are not truly a "direct fit" for a 1994..you'll need a dremel and a saw to cut the brackets and shroud to make it fit properly..but overall a great improvement to your car.

 

i got a dewitts in my vette also and i think i seen it hit 180 once
and i got a quite a bit of mods
but i also use a 160 stat

 

I'm a satisfied customer.

My essentially stock '89 L98 has an OEM thermostat, the OEM
auxilary fan, an aftermarket Echlin fan switch set to engage at
213-229º (#FS112) and Water Wetter in 50:50 glycol/distilled
water coolant.

Prior to switching to the DeWitt, temperatures would climb past
225º while in line for runs at the AutoX. I would have the climate
control set to Auto and the heater set to 80º in order to be sure
that both fans engaged and that the in-car heater assisted.

Since the switch, temperatures climb to say 205-210º where the
fan(s) engage and proceed to bring the coolant temperature back
down below 200º. In anything, I am a bit concerned that my oil
temperature does not rise above 200º often enough for me to be
satisfied that condensation is boiling off. If I were ever to find that
the stationary cooling was becoming marginal, I would simply buy
one of DeWitt's Twin Spal fan housings.

The early design for my '89 is a beautiful piece of workmanship.
It came with the appropriate rubber mounts and was shipped in
a well-designed carton. The advertisng is true, it really is a direct
fit.

(The one tip I would pass along if you decide to buy is that you
gently chamfer the inlet for the coolent level sensor. Mine seemed
to have an as-cut edge and needed some help so as not to damage
the o-ring on the sensor. Small potatoes.)

.

 

Thanks guys for all the Input. I do believe that I am just gonna have to go and order a radiator. I know GM designed the motors to handle the 225/235 degree temps, but temps above 205/210 just make me nervous.
Thanks again.

Dray

 

If you do proceed, use fresh coolant for the change and consider
changing the coolant a second time after the rad has been in
place for a few months. Distilled water, not tap.

Going forward, change coolant at least every two years for best
results from the additive package.

The p/n for the cooling system tablets that GM recommends is
#3634621 for a pkg of 6 pieces. Get these from a GM dealer or
ACDelco outlet.

.