Hello,
I have a 99 expedition and the rear end is sagging. It was working fine then it sat for about a week and it was low. Compressor is not turning on, however if I remove the pigtail from the relay and jump the positive and negative it will run. During this the front end will lift higher but not the back. If I remove the air line from the valve on the driver side under the driver door, air comes to the valve, however I don't get air after the valve. I tried to test the valve by connecting a battery to it, I did not hear it open or close. I replaced this but I am still having the same issue. Rear height sensor appears to be attached as it should. What else could keep air from going to the back end? I will mention that using a test light on the pig tail by the relay, the small wire on the outside (someone said command line from module) didn't light up.
I have a 99 expedition and the rear end is sagging. It was working fine then it sat for about a week and it was low. Compressor is not turning on, however if I remove the pigtail from the relay and jump the positive and negative it will run. During this the front end will lift higher but not the back. If I remove the air line from the valve on the driver side under the driver door, air comes to the valve, however I don't get air after the valve. I tried to test the valve by connecting a battery to it, I did not hear it open or close. I replaced this but I am still having the same issue. Rear height sensor appears to be attached as it should. What else could keep air from going to the back end? I will mention that using a test light on the pig tail by the relay, the small wire on the outside (someone said command line from module) didn't light up.
