I've been looking online and seen a couple of posts about this ac mod but not anything about the 6.4. Jw is you can do this to the 6.4 if so then some instructions would help.
Thanks
It's said that it makes a 10 degree difference. The heater core is constantly putting out heat in your cab. And with the mod while on max ac stops coolant from hearing it up.
Hmm I may have misspoke
6.0 uses a blend door to control the heat but most ( not all ) 6.0's have a valve to block the heater coolant circulation flow when MAX AC is selected
I thought the 6.4 had one also
but I am lucky enough to have to work today so i couldn't verify it actually has one
Just splice in a ball valve on the heater hose by the passenger side valve cover. Enjoy
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