have a 03 sonoma 4.3 4x4. the heater blows air outof all, I changed controls n noticed signs of oil? 4x4 isnt working, hear engage in transfer case. little vac? where do i start?help much appreciated!


Asked by clinton Feb 19, 2012 at 12:31 AM about the 2003 GMC Sonoma SLS Crew Cab 4WD

Question type: Maintenance & Repair

thinking I narrowed to vac problem. push button on 4x4, an here transfer case engage, so replaced accuator on top of transfer case, that not fix. took battery tray out, an very little vac going to diaphram? Diaphram looks decent shape an can move cable. when running in 4 wheel drive just have little vac an cant believe it enough to move cable. an idea on vac or where to go next?

1 Answer


pinhole vac leak. Blew cig smoke through line an found line rubbin by tranny. replaced an all works like new.

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