Sounds to me like an air divertor issue under the dashboard, like heat is getting into the air flow. I thought that as well, so I clamped off the coolant hose that goes into the cab, with no impact on a/c temperature. Is that a good way to check for that? Or could the truck be pulling in hot ambien...

Hello, I have been lurking for a couple of months finally decided to post my issue. I have engine swap vehicle (Ford Super Duty with a cummins), i purchased it with the swap mostly done accept A/C only working sometimes. Long story short, i found the issue as a plugged/backwards orifice tube. When I...