07 f350 truck sitting in driveway running or stop when driving blows cold air start moving again nd heat starts coming out again nd obiviously auto 4x4 doesn't work so vacuum pump or leak? Any thoughts thx guys
First you may be dealing with 2 seperate problems. Install a vacuum guage at the pump to see what is happening. Your cold air while setting may be a water pump or even worse headgasket, hopefully it is a vacuum problem. This is all just a guess from this side. Test,verify,repair.
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