By 2003 most air-con systems had considerable electronic control and your problem might be caused by a malfunction there, wiring problems, compressor clutch problems or maybe there is a leak and the refrigerant pressure has already fallen to the point where the system is ceasing to work depending on temperature.
SOURCE: '99 expedition xlt a/c
replace the actual temperature control switch (the one w/ the fade from blue to red in the middle
SOURCE: Temperature Control not working on 1999 Ford Explorer
Sounds like your temperature actuator is not moving or your temp door is broken. On max a-c ,coolant is shut off to your heater core allowing only cold air in.
SOURCE: how to relieve the pressure on the fuel system in
look for the fuel rail, it should be the chrome pipe that runs between all of the injectors, there should be a plastic cap that you can unscrew and under it should be the pressure check port, it looks like a regular tire valve, with the ignition key OFF push the valve in and the fuel pressure will be released, fuel will also be released so be sure you have a rag handy, and don't look into the valve when you push it
SOURCE: 2000 Ford Expedition front air not blowing
TRY JUMPING THE BLOWER MOTOR APPLY 12 VOLTS TO THE MOTOR IF IT STARTS THEN THE PROBLEM WOULD BE THE SWITCH IF IT DOES NOT START THEN THE MOTOR IS THE PROBLEM GOOD LUCK HOPE THIS HELPS
SOURCE: My 2000 Ford Expedition XLT will not go into P,R,N,D,2 and 1..
You know,i had kind of the same problem with my 2000 f150,just incase you didnt check this,look under the dash at the bottom of the steering column,there is a bracket that bolts on with 2 torque bolts at ( t-25 or t-30) the shift cable connects to that bracket and when it loosens up it wont go into park or if loose enough it may not shift to reverse either.An easy way to tell if its loose is if the shift lever feels loose or real easy to move.Also at the transmission where the shift cable connects there is a plastic holder with groves on it for adjustment,dont try adjusting it but inspect it if its loose or broken,if you try adjusting it then its tough to get it back where it needs to be for all the gears to work with the shift indicator tab,about it not starting,that may have to do with the safety neutral switch on the transmission,but double check the linkage to make sure its really tight before worrying about that switch,im not always on line these days but i will help more when i can.Good luck
Testimonial: "nov2771 advised with the 2 torque bolts at (t-25 or t-30) was right on the money. The bolts were loose...However, upon further investing I noticed that on the top of the column there is a notch that goes into a slot right before the two (2) torque bolts...this gear is what i believe prevents the car from going into the parking and prevents the key from being removed at the ignition. The shift lever moves freely...but does not move the cable and gears at the transmission.... "
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