[HOTRODSRJ]

WAIT.......DON'T DO IT!!! Add dexcool that is! I have to take exception with the last poster that recommended the "orange" or red stuff. This is also called "dex" and is NOT compatible with any green or yellow antifreezes and will give you maintenance fits. You cannot run this in any percentages other than 50/50%!

Unless you are starting with a completely fresh fill (like new system) or are already using dex do NOT switch. And the ethylene glycol (green or yellow) today is just as good at protecting aluminum parts as the red is.

Read here for more information... http://www.inccn.net/jscooling.htm

To answer you other question, yes you can run less % of antifreeze to distilled water in the summer and put just enough antifreeze back in during the winter to cover the minimum temperatures that the car will see.

 

[HOTRODSRJ]

Alot of the guys here run clutched fans successfully and like them alot. I for one do not. The reason is that you can never tell whether you are getting the full engagement or not until it's too late? And, the aftermarket clutches that are made today are kind of a "universal" replacement. GM had over 60 varients of the clutch mechanism depending on application. So, many new clutches today DO NOT conform to the original specifications for most applications.

I am now a converted flex-fan guy. Yes, I said flex fan. I never used one and was absolutely against them due to the shoddy attachment designs and ineffectiveness. That is until Derale came along with a great new technology design. Derale has a heavy duty series that is made as well as the standard fans and uses much improved connections and moreover high quality stainless steel blades that allow higher attack angles at idle and slow speeds, yet give up their angles at high RPMS. I run a 17" Derale #17217 on my 69 Camaro, 400hp+/air/traffic/heat..and still flog it to 6500 rpms on a regular basis. They are not noisy either and my temperature gauge stays on 180 all day long.

My friends 69 Chevelle SS396 w/air would not cool here in Atlanta. We dumped the clutched fan and also went to a 68 shroud and added a 18" Derale heavy duty and he's a happy camper today!

Just another alternative to meantion...that's all.