1999 expedition 4x4
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I don't think that's the problem because when I turn the switch I hear a clicking like a switch attempting to switch but it can't so it's cicking over and over plus when I start the truck the low range light will illuminate during the initial light check when the key is turned on. To explain further I was having trouble with my air conditioning defaulting to defrost, the vacuum line from the one-way check valve to the firewall was fine with no brakes so I made an assumption that the vacuum problem was somewhere in the dash so instead of tearing the dash apart I bypassed that line entirely with another line finding the easiest way to route up to the controller which fixed the a/c problem. My question would there be a correlation between doing that bypass and my current four wheel drive problem. I'm sorry about my cryptic descriptions I'm not a mechanic I'm just guy trying to save money
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