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Than it may be a heater core issue.
How long would you say it takes the truck to start getting warm, like when the gauge starts to hit the very first line.
if im driving, my truck is usually warm within 2-3 minutes, full temp within 5 minutes. but then i also have an E-fan so its not pulling cold air constantly.
Good thing the winters almost over haha. Other then that, the truck runs like a top. Not as peppy as I was hoping for, but its a 3.slow I wasent expecting a vortec 4.3