SOURCE: heater core on a 2003 Chevrolet pickup 4 wheel drive crew cab
if you have air conditioning you will need to take it to a garage and recover the r134, you will need to remove the dash to allow you to remove the heater box, it's an ugly job, I've done a dozen or so and can do it in about 6 hours now, the first time it was closer to 11 hrs, good luck
SOURCE: Grinding and clunking noise while turning in 4
I agree w/ Dave, if u have a part time system, u should not use 4wd on dry pavement, if it's full time 4wd, there are 3 couplings that shift torque to different axles to to allow wheels to spin at different revolutions, and u should not experience the 'driveline wind-up' ,or torque bind. If u do, the system needs to be inspected for problems.
SOURCE: Automatic 4 wheel drive on Ford Expedition
sounds like its stuck.this was never a good system. if you have the owners manual follow it to a T. ussually if you find a dirt lot engage the 4x4 run it for a few then shut it off. then back up ten to twenty feet this will set things right
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