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We have 05 Tahoe and recently the heater seems to work only when it wants to. we can drive it and set the temp control to 80 and it continues to blow cool air, then maybe 5 miles down the road it starts blowing warm air. After maybe about 5 minutes it starts blowing cold air again not A/C just...

This last week the message showed up on the dash saying service 4WD. Has anyone encountered this before? Does it mean something is wrong with the 4WD or that it's time to change the fluid? Hate to take it to GM to find out it is something I can do myself. Hope to hear feedback on your...