i have 2007 envoy denali its come with clutch fan controled by computer i,m planning to remove them and install dual e fans for better fuel economy and power, i was looking in the internet and some one said there is nothing called patch to upgrade you PCM with HP tunners you can only turn the fans on , is this ture . i mean is this that simple i thought the patch is i file should added to pcm , and i found the harness at wester garage and pcm forless ...
so any done this before help because here in kuwait really hot and i need to remove the clutch
bbye