my 1990 runs above 230 degrees

  Thanks so much for this info i will check it out but from what ive seen this is great info and the location will help me a great deal also....thanks again and i will be posting pics of the car hopefully soon have a great and safe day

As Stated clean your radiator, check all relays and fuses. During the summer I run straight water and wetter water, I changed stat to 160 and had ecm reflashed to turn fans on early, never get above 175/180 sitting in traffic.

I wouldn't get too concerned about running 230-240 at red lights if the A/C is running. However if its running that hot while the car is moving there is a problem that can be solved and it won't cost you a fortune. I live in Mesa AZ and it is VERY HOT. The only time I get that hot is at lights with the A/C on. On Corvette Forum I was beat up by its members telling me how stupid I am. If you want to learn from my experience get on ebay and buy a American Eagle 2 row radiator all aluminum 1" rows. Delivered to your door less than $200. Made in China yes but a quality product. The Dewitt radiator costs $550+ shipping. Your choice. If you do this job replace all the hoses while you are right there and prevent any BS. Run 50/50 and enjoy the ride. I ended up replacing every single part from the water pump to the radiator. I spent over $700 in parts and labor. However I won't have anymore issues with it at least not anytime soon. My fan comes on at 190 degrees. The auxiliary comes on at 230+ or when the A/C is turned on. 

Like helpos (Paul) and Vette2100 said:

If you would send me that trouble shooting info I'd much appreciate it Adams' Apple.....

I'm having much the same problems as Bill is.

Thanks
Colin.

Good tip, HW -- I'll give it a try too.

C.

The info I sent was specific for the '90, but I'll send it your way...most of it might be the same as yours. If not, lemmie know, and I'll get the "correct" info for your year.

The 90 and 94 cooling fan systems are different.

The 90 has an ECM controlled single fan, single speed main fan, and the switch controlled B4P boost fan in front of the condenser.

The 94 has dual main fans, no B4P boost fan. The main fans are arranged in a Lo-Hi speed configuration using 3 relays, both controlled by the ECM.

The circuits are very different.

Got it this morning and thank you AA ...... Lots of good info here -- cheers for taking the time.

Colin.

After you get both fans working, or replaced, plus relays, then make sure the leaves and feathers and crud between the radiator and condenser are cleaned out, or replaced, as mine had to be, then you should put a screen between the road and your fans+radiators to keep the road kill from killing your cooling system, again.