Question about 1998 Ford Expedition

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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.

Thanks in advance.

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