Where can I buy new or used switch assy-high pressure cut off switch for 2000 quest with rear ac, Part number is 921390b700, but part is discontinued by Nissan.

if on and off consistently [short cycling ] the usual cause is low or short on freon others are low pressure sensor switch -or clutch failing but the usual problem is freon level

Here Richard.. check this out,, it will give you what you need to know to accomplish the job!
Port finder AC Pro

Why do you need the high pressure port?? That is NOT where you charge the system!!

go with the ac guy
there are systems that prevent the ac compressor working
high pressure switch which cuts the ac clutch if the head pressure goes too high
low pressure switch which cuts power to the ac compressor if there
is no gas in the system
climate control systems which cut power when the ac is not required
fuses to the ac system
get a better explanation or seek advice from other ac mechanics

NISSAN QUEST 2005 SE ,FRONT BLOWER RUNS AT HIGH SPEED ON HEAT/AC,EVEN WHEN THE LED INDICATORS SHOWS DIFFERENT SPEED

Your confused

If you have a leak, you have to repair
the hose assy etc

I am familar with classic tool design
but not the cut switch.
Explain that to me

You say hose busted,on what,your refrigerant
gauge manifold

needs new fuel pump located in the gas tank.

Try replacing the low pressure switch and the high side compressor cut out switch..look on the low side for the low pressure switch (large line/hose It will have two wires gong to it...The high side cut out switch will be on the high side line/hose or in the back of the compressor...If this doesn`t help then have the system pressures checked

whenever the ac system has been opened it should be hooked up to a vacuum pump designed to evacuate the ac system of any foreign debris and oil etc and after should be able to hold a vacuum to show that there are in fact no leaks then if all is ok at this point you can then charge your ac with the proper freon specified for you car when the pressure reaches satisfactory level the ac compressor will then cycle on you should not bypass the low pressure switch

The ignition crank shaft is broken inside the Steering Column Lock Assy. You will need to buy a new assy (cost appr. $202.21) and 2 steering lock bolts (cost appr. $4.96 ea) at a Toyota or Lexus dealer. Call either dealer for best price and availability. To replace you'll need to remove the black snap-on panel below speedometer then remove the screws securing the driver side dash. Behind the dash is a steel plate. Remove that and remove the steering column covers by turning the steering wheel to access the screws. You'll see that the SCLA is secured by 2 break-away bolt (this is an anti-theft feature). Use a dremel tool with cutting disc to make a notch in the screw head to remove with a flathead screwdriver. If this doesn't work your other option is to cut the bolts where the assy bolts together. Remove the broken SCLA and remove the key FOB and install into new SCLA. If your mechanically incline this should take about 2-3 hrs. and save you $300-400 in labor cost. Part numbers are same at Toyota and Lexus dealers.

Steering Column Lock Assy: 45280-60510

Steering Lock Bolt: 45897-12020 (need qty. 2)

fan elays are under hood in black box by battery. 3 of them. 2 for high speed, 1 for low speed. Default is high speed when there is a probem.

Suspect maybe they shorted something out when fixing dent. Did they do any welding on the van? Connecting the cables to the body can sometimes send voltage where it's not wanted.