Can a vacuum switch over fill a transfer case?
Seals inside the switch keep the fluid inside the transfer case out of the vacuum lines. However, it’s possible for the transfer case to “over-fill” itself with fluid. How?
What happens when the transfer case goes bad on a Sonoma?
GMC Sonoma & Chevy S-10 Transfer Case Vacuum Switch How to decontaminate your vacuum lines when the transfer case vacuum switch goes bad GM S-Series 4WD Troubleshooting With either option, two things are happening when you push the 4WD button or throw the lever into 4WD. First, the transfer case shifts and delivers power to the front drive shaft.
What happens if the vacuum hose is missing from the transmission?
The transmission will work without this line, but the shifts will be hard as if the throttle was all the way to the floor. If the hose is broken or missing, there will also be a vacuum leak at the carburetor, causing a rough/high idle and possible an intermittent backfire.
Where does the vacuum line go in a truck?
If the truck has a vacuum hose to the transmission (to the vacuum modulator), the line will be a metal tube attached to the large tube that the transmission dipstick is in. It will come up and connect to a hose that will run to the base of the carburetor.
GMC Sonoma & Chevy S-10 Transfer Case Vacuum Switch How to decontaminate your vacuum lines when the transfer case vacuum switch goes bad GM S-Series 4WD Troubleshooting With either option, two things are happening when you push the 4WD button or throw the lever into 4WD. First, the transfer case shifts and delivers power to the front drive shaft.
Seals inside the switch keep the fluid inside the transfer case out of the vacuum lines. However, it’s possible for the transfer case to “over-fill” itself with fluid. How?
Where does the vacuum line come from on a GMC Sonoma?
One line comes from the vacuum source under the hood; another line goes to the actuator under the battery tray (pictured above right); and the third line is a vent line that tees off into 2 separate lines. When the ball is pushed, it opens a valve that lets the vacuum through the switch and to the actuator.
What happens when the transfer case is full?
When that happens, ATF from the transmission will leak into the transfer case. transfer case also uses ATF for fluid). When it does get full, ATF can lines that connect to the switch. Once the fluid makes its way into the lines, vacuum sucks the fluid all through the vacuum system. This is bad.