Late-model 5.0 Mustangs were designed to run relatively hot with a factory-installed 193-degree thermostat. Running these engines at higher temperatures, combined with emissions devices and a somewhat lean fuel curve, allowed them to pass emissions. At least this is what the Ford engineers envisioned. But when a Mustang owner takes the engines performance outside of Fords parameters with high-performance parts, such as heads, camshafts, and intakes, the 193-degree thermostat usually gets the boot for a 180- or 160-degree unit. While this will help occasionally, other forms of extra cooling are needed. Larger core radiators, synthetic cooling mediums, and other fixes are commonly found under the hood of a hopped-up late-model.
The factory clutch fan is one component many owners dont think about much. This fan was designed for stock usage as well and will not handle a performance-built engine that has a need for extra cooling. Replacing the stock clutch fan with an electric fan is one of the more popular ways to increase your cooling benefits.
Several types of electric fans are on the market, from low-buck to outright dangerous, but we like the CoolPower-series fans offered by 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 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 temperature switch (the 160- and 180-degree switches are optional). The Supercool fan kit is identical to the standard kit, except that it flows 2,800 cfm and requires a 130-ampere 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-ampere 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.