wires on replacement thermal actuator C/K Car Forums ... 1993 Chevrolet/Geo Chevy Suburban - 4WD. J-Ri. 12-11-2004, 03:41 AM. ... I t was the thermal actuator same as the old one . the electric one is a upgrade But like I sayed I hooked my old actuator direct to the battery posts and it worked fine ? My problem is when put it in4 wheel there is ...Feb 14, 2013 · Hello all, Im new to the forum and I'm looking for some help. My 4WD won't engage. The truck is a 97 sierra, it has a manual floor mounted lever actuated system. The front drive shaft spins when engaged and the actuator that goes into the housing works but it won't engage the front wheels. In the first pic you can see the air line hose where it hooks into the air actuator collar inside the diff. In the second pic you can see the metal air line (removed in my hand) that threads into and passes thru the diff housing to connect to the air hose running into the air actuator collar.

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