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Hello, I had the same problem when my Lincoln was new. Sometimes the battery starts to short out internally and it triggers the alarm. The Dealer put in a new battery and the car was fine from then on.
You also could be having a problem with the AirRide. Some will compensate to keep the suspension from bottoming out and when the battery gets low enough, it will trigger the car Alarm.
You could leave yourself a note on the car seat and open the trunk and shut off the AirRide when it is parked as a test.
If you come out and the suspension has dropped, you will know the AirRide is to blame and act accordingly. Use your reminder note to avoid driving without the suspension being turned on.
Have your battery tested in the meantime. Autozone, Oreillys, and Advance will test it free and scan your car free too!
Hello, Check your fuse panel and the Airride switch in the cargo area. It is usually next to the fuelpump safety switch.
Here is how the system works. The vehicle is suppose to stay low for loading and for passengers to get in and out of the vehicle. Every opening (Doors, Rear cargo lid) has to be shut before the AirRide pump will work. Then the pump will work and level the vehicle.
For the doors, it uses the doorjam switches and there is a jam switch in the cargo area opening too! This switch may look more like the one on a refrigerator or can run off the hinge mechanism. For the most part, the door ajar warning will tell you there is a problem in the openings.
After the engine is started, a Relay will power the pump. It is probably your problem if a fuse has not blown. Check with Autozone or similar for an Airpump Relay. The Air release vent Solenoid is a different part and not your problem. If the vent Solenoid was stuck, your pump would run and the vehicle would not raise.
I hope my Solution is very helpful in fixing your Expedition. There is a Diagnostic plug which requires a better Scanner to read, but it is quick and accurate. You would have to call around for Service places having the special scanner for this job if the Relay does not fix your problem.
I will try to help. Noises are hard to diagnose online because a "pop" to one person is a "boom" to another. I think the best way to locate this noise would be to raise the car on a lift and let it set overnight and then start it the next day. The inspection time will be short, until the parts warm up. You can also try to drive the vehicle on ramps, leave it until the next day and then crawl under the vehicle before someone starts it. Again you will have limited time to inspect.
There is one thing to try before lifting the vehicle. In the rear cargo area there is an ON/OFF switch for the Airride. Turn it off, roll down the window and start your car. If the noise is gone, you have a noisy Airride relay. There are scanners for the Airride and you need it diagnosed.
If turning off the Airride had no effect, restore power to it and then start with a cold engine again. Open the hood and have someone start the car while you look at the A/C clutch and listen for your clicking noise. Sometimes when your A/C gets low on Freon the initial start will make the A/C clutch cycle frequently until it catches up. Charge the system to remedy this.
Your exhaust system will make clicking noises sometimes when a gasket called a "donut" (in shop terms ) is worn. The Catalytic converters will also make noise due to heat expansion. The heat shields for the converters can also make noise. Aside from loose welds there is no sure cure for this.
Finally, the engine parts like valve lifters and "Cam phasers" can do this and transmit the sound under the car. This is a problem which a Dealer can help with because there is an extended Warranty for "Cam Phasers". Usually the Phasers do not quieten down under 2000RPM warm or cold. I hope this helps you find your problem.
There is a diagnostic plug for the Airride. You might find a scanner at Autozone or Oreillys. They will scan for free if they have a compatible plug.
You have done a good job in trying to track the problem. But the ride height sensors and the angle of your parking area can affect when the parts will work.
The door jam switches also put the Airride into sequence. You may have noticed how the car waits until everyone is out before deflating. So not hearing the airflow while you hear the rear solenoids "clicking"
may mean the door jam switches are preventing the pumping.
This is one of those things that a diagnostic tester can find. This is also why each door jam switch costs over $10 and have 3 wires instead of 1 grounding wire.
Check to make sure the ground lead-off wire to the fenderwell has not come loose or corroded. Also make sure you have a good engine to fierwall ground, this is the flat braided uncoated piece of connector running from the firewall usually to an intake manifold bolt. Thanks, Dana.
It sounds to me like your compressor got killed. What probably happened is that the airbag got a hole or tiny crack in it so the compressor has to work extra hard because it is like blowing up a balloon with a hole in it. Therefor the airbag killed the compressor. I would recommend going to strutmasters.com and taking a look at our conversion kits. these convert you from the airbag to a powder coated American made steel coil spring that is guaranteed to last the life of the car. I added the link below so you can check it out. http://www.strutmasters.com/ford-suspension-parts-s/75.htm
Replacing with new airbags for the Hummer will be expensive because it is not a permanent fix. I Would go with springs. I understand people enjoying the air ride but I promise it is more trouble than it is worth. Compressors have a 100% failure rate. What will happen is the airbag will end up getting a hole or tiny crack in it so the compressor has to work extra hard because it is like blowing up a balloon with a hole in it. Therefor the airbag kills the compressor and you have to parts you have to constantly keep buying. With air suspension there is never a permanent fix. I would recommend going to strutmasters.com and taking a look at the conversion kits. these convert you from the airbag to a powder coated American made steel coil spring that is guaranteed to last the life of the car. And for a very affordable cost. I added the link below so you can check it out.
Hopefully this will help
located on the drivers side ( In the trunk ) there is a switch. make sure switch is turned on. When off this will disable your air ride and air ride pump cause- it not to work.. It may have been dis-abled. this could be your problem... Good luck