If you mean the idle air control (IAC) valve, on the 4.0 L OHV engine it is on the driver's side of the engine, mounted on the upper "plastic" intake manifold, right above the rectangular DPFE sensor.
broken
the pressure would be low
No, you cannot replace a faulty Ford Sport Trac cluster with a cluster from the 2005 Explorer.
USUALLY HAS TO DO WITH A FAULTY ABS MODUAL
An AC compressor will only engage when the "low side" refrigerant pressure sensor detect that it is above a specific PSI level. A faulty sensor or more likely a low refrigerant pressure will prevent the compressor clutch from engaging. There are quite a few other conditions that can result in an inoperable compressor as well: Faulty clutch Faulty relay Blown fuse bad connector Damaged wire Faulty controls on the dashboard... To properly diagnose the problem will require the assistance of someone who can investigate the AC system.
Do you mean P0433 ? - Evap Canister Purge Control Solenoid or Valve Faulty or Faulty Circuit
yes it can, if the compresser locks up the belt can be destroyed.
Yes.
Try jumping the two terminals of the wires which go to the low pressure switch. That's a possibility, as is low refrigerant, a bad compressor clutch, or a faulty fuse or relay to the compressor clutch.
It is absolutely worth replacing the compressor. Sometimes a compressor will have faults straight from the factory, but once replaced, your A/C should serve you well for the next 10-12 years. A faulty compressor does not mean the unit should be trashed too.
The A/C light blinks because the A/C computer is not "seeing" the compressor shaft turning. Probably a relay fault but could be a bad mag clutch, broken wire, siezed compressor, faulty compressor speed sensor,,,the list goes on and on.
The whole thing is a false analogy.