The ZF14S - 14" 2670 CFM ZIRGO HIGH PERFORMANCE RADIATOR COOLING FAN
MSRP: $169.95 YOUR PRICE: $139.95 appears to be the winner. At a CFM of 2670, it blows away (excuse the pun) the Spal fans, which are advertized as being used in NASCAR cars.
The aftermarket fans will fit without a problem using the universal mounting brackets. However, here is where I need an answer from a GM service tech or an electrician. There are only 2 wires on the aftermarket cooling fans - positive and ground. However, on the OEM cooling fan, there is a 3 wire harness. The 3 wires go all the way from the relay to the fan plug and then to the fan motor. I would assume that 2 out of the 3 wires is also positive and ground - but which 2? What wire is what? Also, what is the third wire for? Can you make a 2 wire aftermarket cooling fan work by somehow addapting it the the 3 wire plug that goes to the relay?
I would assume that all GM cars have this 3 wire cooling fan. So, who is buying these high performance 2 wire cooling fans? There has to be a way to make it work. :confused