2016 f150 transfer case new5/1/2023 ![]() The one line (check valve) should have a constant vacuum when the engine is running. There are 2x vacuum hoses held together with a black plastic housing. So to test for vacuum, you need to remove the vacuum hoses from the solenoid which is located against the firewall. You won’t even need a vacuum gauge to accomplish this or any fancy testing equipment. What you want to do is, test the vacuum line for pressure. ![]() It is usually situated on the passenger side of the truck next to the battery. The first thing you want to do is locate the solenoid. The purpose of this test is to make sure your system has vacuum pressure and that the hoses are void of any leaks and cracks. Your first point of troubleshooting should be to locate the vacuum system. So what’s the first component we need to find? You just need to understand how the 4WD system works and where to look. The nice thing about diagnosing the F150 is that you won’t need any high-tech equipment and specialized tools to diagnose the problem.
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