SOURCE: Change fluid in transfer case
On the backside of the transfer case,as it sits in the vehicle.The plugs will be facing the rear differential.The one down low is the drain,while the top one is fill,of course.The fluid recommended is automatic transmission fluid,Dexron,and the transfer case is full when the fluid is at the bottom of the fill hole.
SOURCE: 4 wheel drive on 1999 chevy blazer
99 chev blazer should have an electric motor not a vac switch...Is your controll on the dash a switch you turn.. or on the floor you shift ??
SOURCE: 4wd won't engage on a 94 Chevy K1500
If you haven't got 12volts at the actuator(TLA) plug, then you are probably correct from what I have researched as well.
I have found a solution to the problem that would eliminate the need for 12volt power or a TLA.
http://www.4x4posi-lok.com/app_chevy-k.html
I keep blowing fuses on my 1997 GMC K1500 and think this switch may be the culprit for me as well.
SOURCE: Four-wheel drive not working. No
Was the transfer case fluid changed every 50K miles? This very important on these trucks. The Transfer Case Control Module (TCCM) could be at fault, especially since you have no lights on the selector switch. Is the Service 4x4 light on? When you switch from 2H to any of the 4 wheel drive selections, do you hear any actuator noises coming from under the truck?
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