Review on GM Genuine Parts Engine Cooling Fan Clutch 15-40133 - Improved SEO-friendly product name by Larry Sabey

126.00 for 2007 Chevy Trailblazer 4.2L The fan "roared" and would not come loose at high speeds. Much is written on the net about how to replace yourself. Before buying I would advise you to check the fan relay which is located in the fuse box under the hood and costs no more than $30. I have changeover relays. Replaced this fan and still had the problem, found the faulty relay and replaced it, then the fan worked fine. I may not have had to change the fan, just the relay, but at 126,000 miles I change it, the water pump and the serpentine belt.