Having problems with your 1999 GMC Jimmy ?
On my 2000 chevy S10 blazer, when I push the 4HI button, the 4HI and 4LO buttons flash a yellow light and it won't shift to 4WD, stays in 2HI and the light in the 2HI button is on yellow......I hear clicking in the dash but no shifting to 4WD?
Vacuum leak or vacuum locker solenoid problem. a great way to check for both is to remove both vacuum lines from the solenoid (located on firewall above destributor), and put a connector between them, push the button on the dash and see if it locks in.
Repair Help & Product Troubleshooting for 1999 GMC Jimmy
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