20 Most Recent 1999 Ford Expedition Questions & Answers

The GEM is located under the dash, on driver's side, on the back side of the fuse panel. If under the dash, upside down (or not), the GEM is located on the door kick panel side of the brake pedal, against the back side of the fuse panel, behind the under-dash fuse panel. The pin-out of the GEM is available in the Ford Factory wiring diagram manual which you find available for purchase on Ebay, or which you can find electronic versions available for purchase on eBay as well. (There is no free .PDF that I have ever seen.) All that is available is the pinout. The internals of the GEM module are not disclosed by Ford, and no technicians or dealers have the information (only Ford Engineering knows the internals, the unit is treated as a black box and cannot be service because of the lack of internals information.) The GEM malfunctioning (old) can be responsible for Window operation problems (as can many other things), windshield wiper operation problems (but also usually you steering column stem, or the two plastic connectors in the steering column that connect to the stem base), or the 4x4 operation (as the GEM runs the step motor and looks at the 4x4 switch input). Also, on '99 & 2000/1/2 Expy's, the GEM also takes the ABS wheel outputs, and refactors a "VSS" input the speedometer.

A cable to do what ... I wonder.

Dont be so fast changing the pump, when it was just the lines on mine. $15 at Walmart.com.

most likely not

Find the source of the leak and fix that. Once water gets into the fuse box it will short circuit the componets such as fuses and cause all kinds of problems.

The emission hose routing diagram should be on a 3" x 5" sticker either on the underside of the hood or on the top of the radiator support or on the air cleaner housing cover. It's kind of a symbolic diagram but will indicate what goes where. There are very few vacuum lines on one of these so it should be pretty straight forward.

Try a qualified repair shop.

horn relay (located in the battery junction box [BJB]).thanks

Any codes?

Cycle the switch by your passenger wheel well (inside the car). Mine did the same thing after not driving for 4 months with the battery drained. In noticed the rear was lower than it should be. Once I turned the switch off then on, it leveled up.

Is the car parked or running?

You may want to remove the cover over the wiper nut and tighten it down. Make sure you don't exceed the torque settings. The nuts have a tendency to back off causing the wipers (or one wiper) to slip.

Check the door locks take off the trim panel on the doors and go to the latch at the back of each door and check that the wire is connected and that it's clean this is a ground when the door is opened the interior lights come when you close the door they shut off if the wire attached to the locking latch in each door is broken or corroded or unplugged they can fall off the lights inside will stay on it only takes 1 bad wire for this to happen also check to see if you door pin switches when you open the door by the hinges on the frame about halfway up you'll see a pin or button like switch on all doors again one bad one is all you need and the running board lights are probably on the same circuit oh yeah there's a tailgate latch to and or a pin switch so take off all panels and look for the bad wire and in the frames where the doors close in the front and back doors those pins are in the front part of the body where the door post are the rear tailgate it's in the frame on the side near the top to stop draining the battery till you find it take out the interior light fuse for over night parking

I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

Ford calls this the "GEM" It is to the left of the brake pedal arm under the dash. It is just a matter of a few fastners to remove.

Not enough transmission fluid in the tranny, Pressure regulator malfunction, reverse solenoid sticking or the transmission control module is bad.

I suggest you try one of those instant download manuals. My brother ( a mechanic) buys it when he can't fix some technical issue He buys from www.reliable-store.com . A lot of mechanics actually do this. Website is very good for this. Must try it !!

Sounds as though the signal relay (cube sized) switch has failed, this is normally located under the steering console once you have removed the cover panel.. I do hope this helps....

The IAC wouldn't cause a noise like you describe, and as for the spark plugs, it is possible but only if the plug broke off, or blew out of the engine. You say engine is running OK but a V8 can do that on 7 cylinders. Also you may be describing the beginning of a piston rod knock. You will need to check further. Good Luck Friend