Does anyone know where I can find a coolant fan switch (secondary fan with switch in head) which turns on at about 210-215 degrees? I am aware of the lower temp switches which turn on at less than 200 degrees, which require a lower temp. thermostat, but I don't want to change the thermostat. I also am aware of the Grand National switch which turns on at about 205 degrees, I don't want that one either.

The one for a '93 GMC Suburban (2WD, 1/4 ton) closes at 225*. The connector's different, though. That's easy enough to overcome, if you're willing.

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'87 IROC 5.7l TPI - original owner!

You could buy a Hayden adjustable fan switch, and set it to whatever temp you want.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

I have the Hayden switch and it works great. you can tap into the fan wires and put it over the existing system so if it ever fails the stock system will at least come on at a higher temp. Anyway, just wanted to mention that its range is 90-210 degrees. This is in your range, but just wanted to let you know that 215 isn't possible. My car is all stock and runs much happier with the hayden set to about 205 with a stock thermo than the factory fan temp.

Thanks for the response guys... looks like I'll be getting that Hayden adjustable switch.

When I did my fans. I read the Tech Article which told about how to splice the wire on the temp sender. Then I just grounded out the other wire ran them into the cab under the driverside dash. Put on a light switch with a fuse attached just so I knew I wouldn't fry anything and I just leave mine on all the time. If it is ever cold outside I just flip the switch until the car warms up. Kind of just a nice way to manually bump them on + it could save ya a little cash.