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    Results 1 to 8 of 8
    1. #1
      Join Date
      Jan 2022
      Location
      Massachusetts
      Posts
      9

      PWM Cooling on a new LT4 Connect and Cruise build (1969 Camaro)?

      Hi, Has anyone just wired in SPAL PWM fans instead of using the current GM Connect and Cruise relay controls (on/off)? I know I'd need to add in the temp sensor, but I've had the on/off control on other cars and hated it, while with the PWM, it's hard to tell when the fans are running... Unsure why GM made it so difficult to use modern fans.




    2. #2
      Join Date
      May 2010
      Location
      kitchener,Ontario,Canada
      Posts
      2,336
      Country Flag: Canada
      Im 90 percent sure someone posted a thread about this with a solution. My brain is dumb I just can't remember who .. vapor works ??? Pardon me if im totally out to lunch
      Spinnin'my tires in life's fast lane

      Ryan Austin
      On twitter @raustinss
      On Instagram austinss70

    3. #3
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      I used Spal brushless fans on an LT build with the Spal controller that is available from Vintage Air or Wizard cooling. It is standalone and doesn’t interface with the ECM.
      https://www.vintageair.com/instructions_pdf/113015.pdf

      If you use brushed fans you can use Carls controller available from Northern Radiator on eBay.

      https://www.ebay.com/itm/13343689912...EAAOSwLN5e48q-

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    4. #4
      Join Date
      May 2009
      Posts
      52
      I've used this Derale pwm controller for fans in the past. https://derale.com/product-footer/el...r/16796-detail

      Standalone unit that worked surprisingly well.

    5. #5
      Join Date
      Aug 2004
      Location
      NJ
      Posts
      1,293
      Country Flag: United States
      This can be done with the factory ECM that comes with the harness. You wouldn't need to run another temp sensor as it would just use the one currently on your engine.

      There's a pretty big thread over on Lateral G that discusses this which is very educational. Search for a username "Mikels" who is Dave Mikels and he was actually a GM engineer that helped developed factory programming for production cars. He tunes Mark Stielows cars and can definitely get you set up to run PWM.

      Good luck and let us know how you make out.

    6. #6
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      I think you’ll need to tie in an AC pressure sensor to use the ECM if you have AC.

      Maybe John Parsons will chime in since I think he has done it with an LS but not an LT afaik. It was pretty far from trivial if my memory serves me.

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    7. #7
      Join Date
      Jan 2022
      Location
      Massachusetts
      Posts
      9
      Unless I hear another good option, I plan on going with a SPAL brushless (dual fan) design using their 215' sensor. It's a bit frustrating to not be able to use the E92 computer, but I also have high confidence in the SPAL brushless system to control cooling. I'm anticipating wiring in a trinary switch for a VA AC system.

    8. #8
      Join Date
      Jul 2017
      Posts
      166
      Quote Originally Posted by dhutton View Post
      I think you’ll need to tie in an AC pressure sensor to use the ECM if you have AC.

      Maybe John Parsons will chime in since I think he has done it with an LS but not an LT afaik. It was pretty far from trivial if my memory serves me.

      Don

      This is what I did on my LT but used a factory fan.





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