How many electric fans does a GM LS series PCM need?
How many electric fans does a GM LS series PCM need? GM vehicles equipped with an LS-series PCM and electric fans operate both fans in low-speed and high-speed mode only. This requires two PCM outputs and three relays. By using the two PCM outputs and three relays, two electric fans can be controlled in low-speed and high-speed modes. Do you need air conditioning for GM LS series? Before getting too far into a discussion of electric fans and PCM calibrations, it is important to first consider air conditioning control. This Tech Tip is From the Full Book, HOW TO USE...