Results 1 to 10 of 11

Thread: Single ftermarket fan won't turn on in C5 Z06

Threaded View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Lifetime Member
    Join Date
    Mar 2009
    Posts
    746

    Default Single ftermarket fan won't turn on in C5 Z06

    I installed a Spal fan to replace the dual factory monsters. It tucks up in there real nice and probably flows enough to suck the car forward. . . when hooked directly to the battery. Problem is the bastard won't kick on in the car. I've tried it in both series parallel mode and aux fan mode, I've attached 3 tunes that failed to turn the fan on. Schematic is below, I see no reason for it not to work so it must be some retard logic inside the PCM.



    Fan mod is failed attempt #1, I kept it in series parallel here but changed the values to prevent fan#1 from ever coming on. I also changed the AC pressure values so fan #2 would more closely mimic the function of fan #1.

    Aux fan is failed attempt #2, only change here was switching it over to aux fan mode.

    Aux fan 3 is the 3rd and current failed attempt, I plugged all stock information back into the fans (trying to outsmart the logic here) and just brought fan #2 down to kick on at the same coolant temp as fan #1.

    I'm plugged into the right side fan plug and the left is just wrapped in tape. I'd like to get some factory style connectors on there, but for now I just need to get the damn thing working.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

Similar Threads

  1. Replies: 4
    Last Post: September 25th, 2013, 07:10 AM
  2. S372 single tuning help
    By jordylee18 in forum Cummins 5.9L
    Replies: 2
    Last Post: November 28th, 2012, 01:09 PM
  3. E-Fan Turn on and off question
    By Mikz86ta in forum General (Petrol, Gas, Ethanol)
    Replies: 15
    Last Post: June 14th, 2012, 02:18 AM
  4. Replacing Flash, now PCM won't turn on?
    By N0DIH in forum Gen III V8 Specific
    Replies: 2
    Last Post: March 29th, 2011, 11:27 AM
  5. E38 fan turn on temp.
    By Outwest34Au in forum E37, E38 & E67 PFI ECM's
    Replies: 3
    Last Post: October 25th, 2010, 09:41 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •