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Trying to isolate the concern by dividing the a/c into 2 units. If the lines are cold going to the rear a/c, look at the rear a/c control switch or blend door areas. If they are not, look at the switch from the front controls to the blend door for the actual rear a/c lines.
Ford usually fitted elliptical speakers in their models in the 1990's so it's possible that yours are 6"x9" or something similar.
You can get replacements from Ford, (which are usually very expensive!) or buy some better ones on the Internet, such as Ebay or Amazon.
I bought a pair of German Blaupunkt 6x9's for my car from some site I found on Ebay and the price was around half of that to buy the *same* speakers from Ford Spare parts Dep't!!!
The sound is fantastic!
PS: You should be able to access the rear speakers below the rear parcel shelf at each side of your Expedition. They are held in place by 4 screws, which usually have a Posidriv (+) type screwdriver head.
When refitting, make sure!!! that you fix the +ve spade terminal to the +ve marked on your new speaker & the -ve terminal to the -ve. Do this on both speakers to make sure that they are both in-phase (so both bass drive units are pushing air forwards together). If you don't keep them in phase, the speakers will produce much less bass - which is clearly noticable!
1996 Toyota Avalon Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Radio Dimmer Wire: N/A Radio Power Antenna Trigger Wire: Black/Red Radio Amplifier Turn On Trigger Wire: N/A Front Speakers Size: 5 1/4′ Front Speakers Location: Doors Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Light Green Right Front Speaker Wire (-): Blue Rear Speakers Size: 5 1/4′ Rear Speakers Location: Rear Doors Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White
if you have installed a new cd player in there then the propblem could be that your speaker wires and either touching each other or grounding them selfs out.. pull of the cd player and check to make sure all the speaker wires are covered properly and no bare wires are exposed.. if you still have a factory cd player in it then you will probably need to take it to a dealership to have it checked out..
You need to attach the blue wire on the stereo harness to the blue and white wire on the car adapter harness. they installed a small amplifier to power the rear door speakers and unless you connect those two wires then the speakers will not work.