Quote:
Originally Posted by dayj1
Same question. What engine (and year)?
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2002 Suburban DBW 5.3L here. I can confirm that the fan settings are correct in the tune file...I wrote the file. Altering the commanded "ON" temp for the high speed corresponds with the temp at which it attempts to switch to the high speed relay. If it was PWM, how would it receive feedback?
Quote:
Originally Posted by mongocanfly
a lot of those early ecm's only controlled a single fan and wouldn't run 2 fans....I had close to the same issue...I had to send my ecm back so they could set it up for dual fans...works fine now...
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What was done to "set it up"?