5.0 Mustangs were designed to run relatively hot with a 193-degree thermostat installed in them from the factory. Running these engines at higher temperatures, combined with emissions devices and a somewhat lean fuel curve, is what allowed these engines to pass emissions--at least that's what the Ford engineers envisioned. But when a Mustang owner takes the engine's performance outside of Ford's parameters with high-performance parts such as heads, camshafts, and intakes, the 193-degree thermostat usually gets the boot in favor of a 180- or 160-degree unit. While these will help sometimes, other forms of extra cooling are often needed. Larger radiators, synthetic cooling mediums, and other fixes are commonly found under the hood of a hopped-up 5.0.
One area that many owners don't think too much about is the factory clutch fan. This fan, too, was designed for stock usage and may not handle a performance engine. One of the most popular ways to increase your cooling benefits over the stock clutch fan is to replace it with an electric fan.
There are several different types of fans on the market--from low-buck to outright dangerous--but we like the CoolPower series of fans from Interactive Systems & Technologies. These well-thought-out fan systems utilize the factory fan shroud as the mounting device for a near-stock look with no bulky brackets or other obstructions. The kits come with all required parts, wiring, and connectors and can be installed in just a few hours.
There are two CoolPower kits to choose from. The standard kit is designed to flow 2,200 cfm of air and comes with a 195-degree temp switch (160 and 180 are optional), and the Supercool fan kit is identical to the standard kit except it flows 2,800 cfm and requires a 130-amp alternator conversion.
Since our '93 sedan was wearing a Holley SysteMAX II combination, as well as exhaust enhancements and a Nitrous Works nitrous kit, we opted for the Supercool model. Our '93 already had been converted to a 130-amp alternator courtesy of a Performance Distributors [(901) 396-5782] conversion kit, so we were ready to go for the higher output of the Supercool fan.