Quote:
Originally Posted by FarmerSid
Ready to order the electric fan for the rad. Looking at a Spal 16" Puller Fan. #30102082. Anybody have any other options? Also, do I need to get a relay kit with it? I think my 04 PCM controls the fan. Enlighten me all! Thanks!
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I have a Derale 18916, very similar fan.
Your PCM is capable of controlling the fans, but I don't think in an '04 would have that programmed so you would need to have it added when you do the reflash.
The fan is controlled using a ground trigger, so you will need to use a relay - the PCM grounds the coil on the relay to turn it on, and that's what activates the fan. There's a single wire you have to add to the harness coming from the PCM for this function, if the donor truck didn't have E-fan to start with.
**EDIT**
Check out this link, here:
http://www.lt1swap.com/2004vortec_pcm.htm
That shows the pin-outs for the 2004 PCM - the wire in question goes to pin 42 in the blue connector C1 (the pin is highlighted in blue as well).
I can't remember, were you going to modify the harness yourself, or buy one of the modified ones?
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