Rear bumper lowers, then compresor will come on and raise it.
1998 For Expedition, 135K miles (2X2). started about two monts ago. The rear bumper would lower almost to the ground, then if I get in the vehicle, close the doors then turn the key, the compressor would come on and it would raise the bumper back to normal position. It would stay at normal position for a long time, probably hours (sometimes I do not need to get in the car, sometimes the compresor comes on by itself and reaises the car). However, if two adults were to sit on the bumber when it is in the high position, you would then hear the air comming out from the inside part of the left tire and the rear would go down to the ground rather quickly (a minute or so).
I am suspecting that the compresor works, and chancees are i have a leak in the the left airbag. I read somewhere that the airbags are easy to replace, is that thrue? Can you point me to instructions on how to replace them. I need to do it soon since I have read that prolong leak can ruin the compresor.
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The only place to put gear oil is in the "pumpkin". Otherwise called the rear-end. To do so, I recommend driving the car backwards onto two ramps to raise the rear end up in the air, this also tilts the car forward. Between the rear wheels, in the center of the axle, is a large metal container of gears and gear oil. There should be a large hex-headed bolt less than half-way from the bottom to the top on the rear, facing your back bumper. This is where the gear oil goes in, but after you take the bolt out, before you add any oil, stick your finger into the hole and try to feel the oil level. If you can feel it, you don't need any more gear oil to be added.
Under the hood there is a long turning bar attached. Remove the bar and proceed to the rear of the vehicle. Open the rear door and locate a hole near the rear bumper, insert tapered end of bar in hole and align with slight turning motion until you feel a resistance. Rotate bar counterclockwise in which this will start to lower the spare tire from underneth the rear of the vehicle.
the air bags release air after it sits. The rear raises back up after starting engine, if you add weight, it raises up even more to compensate for level suspension. It should be fine unless it's sitting almost on thr ground, but it does release air and sit lower.
Either someone backed into it or you have a suspension issue. If you have air suspension the light should be on indicating a malfunction. If you do not have air suspension you may have collapsed spring if nothing else is broken
you will need the bumper and the mounting bolts. A junk yard will be your best bet for cheap. look in the yellow pages and start calling around until you find a good shop that does the work for a fair price.