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Re: 4WD not engaging
Most the newer trucks have a vacuum system and some time you need a smoke machine to find the leaks. Try checking by each front wheel you will find a vacumm hose that goes to the wheel hub it is mounted on a bracket at the frame with a small plastic splice check that for cracks if it is cracked or there are any leaks it will not work let me know what ya find.
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Put main gears into 1st.
With a gentle foot on the clutch, you can hold pressure on the selector and slowly bring pedal up so you can 'feel' something moving with the stick. If it doesn't go in first go then 'rock the box' with clutch movement at that sweet spot where it just starts to engage (in and out) and it should drop in.
This is very strange because of How the low range is engaged. I drive a 1999 F150 4x4 which has the same dash and controls for the 4x4 as your Expedition. I do know that the fan control switch is unfortunately the same shape and very close to the 4x4 switch. It is easy to grab the wrong knob and turn the wrong thing than was intended.
My initial impression is if it is possible, your girl could have reached over to move the fan switch and actual grabbed the 4x4 switch instead. Or you were warming up the Expedition and meant to turn up the fan and instead turned the 4x4 switch to Low. Or a backpack she was moving with schoolbooks could have hit the switch. What puzzles me is that to go into Low range, you need a foot on the Brake and simultaneously need the gearshift in Neutral and the 4x4 selector in Low. That is 3 things to make the low range happen.
Even if your foot was on the Brake and the sensors caught the gearshift going through Neutral on its travel to Park, the 4x4 Selector would have to be in Low. There is one problem you can have with the 4x4 Selector.***The Selector has 3 Resistors and a LED bulb.***
You stated the Selector switch was good. This would mean there were 3 different Voltages under the vehicle. Sometimes when the LED bulb burns out, it shifts the Voltage out of range for the Servo, and although the Selector says one thing, the Voltage at the Servo has the wrong value for that function. Since the dash light and the Servo agree on Low, it would seem the Selector is out of sync with the other 2 parts.
I hope my solution is very helpful in solving your problem.
There should be a knob or selector on the dash usually located to left of the radio. When you put your vehicle in 4wd you can do this on the move at a sloe rate of speed but never try to put it into 4wd low on the move or it will hurt the system. To put the vehicle in 4wd Lo stop and put your transmission in neutral and the select 4wd Lo. Hope this helped you out, Roger
Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer