AC Problems

[nipits]

Alright HELP
I have a 2001 Explorer 4d 4wd Vin E 6cyl 4.0 SOHC
and I have been working on the air conditioning and I
have replaced the Orifice tube and it was extremely
dirty and i have metered both switchs and the high
pressure cut off switch is normally closed like it should be
and the other switch on the accumulator i metered and it
is normally open and goes closed when it has pressure on
the system so the clutch on the compressor will engage and
the switch is going closed like it should but the clutch on
the compressor is not engaging, I can apply 12 volts directly
to the clutch and it works perfectly.
The system seems to me that something is clogged but
i don't know what, if you try to put 134a in it it will take
some and the pressure will just build up and if i manually regulate
the compressor clutch so it will take the freon in it will build
pressure and when i engage the compressor manually the pressure
will go down and once i disengage the compressor the pressure
will build up again too high and the compressor will never engage
automatically like it should be doing and i have checked everything.
The only thing i haven't done is have a professional evacuate or vacuum
the system and refill it with freon but still i should at least i think be
able to get the compressor to engage the clutch even if i jumper
the switch on the air accumulator but i get nothing.
SO HELP PLEASE
THANKS

 

[budwich]

If you have the manual ac/heat system, check the AC relay and the corresponding fuses. The AC relay needs to operate to cause the clutch to get voltage assuming the fuse is intacted.

 

[nipits]

Yeah I already checked any fuses and the relay, the fuses are good
and the relay is working perfectly but something is keeping 12 volts
from kicking the compressor clutch and i've checked everything.
but after reading some posts in the forum it looks like i'm going to
have to replace everything anyhow because of the black crystal
flakes i found in the orifice tube, the teflon seal in the compressor
evidently gave way and i'm going to have to replace the accumulator
compressor and orifice tube again and have the system flushed.
But still i haven't solved the problem the system should be engaging
the clutch on the compressor since it is working and i can manually
apply 12 volts to it and it works, something is still a problem, i mean
even if i have to replace everything i'm still going to have whatever
problem i have now by the clutch not receiving 12 volts.
ANY IDEAS ANYBODY.
THANKS AGAIN

 

[budwich]

How did you check your relay??? The AC clutch circuit is pretty simple.... power comes from the fuse (which needs to be checked WITH A METER... not your eyes... you can't see electricity).... the power goes "thru" the OPERATED contacts of the relay (again CHECK with a meter that power arrives at the switched contacts AND leaves)... It leaves and arrives at the clutch solenoid... Check it there and work backwards.... that's the test technique.

 

[nipits]

Anybody have the fuse location on a 2001 explorer XLS for the
airconditioning for the relay that kicks the compressor clutch?
Thanks

 

[bobflood]

Anybody have the fuse location on a 2001 explorer XLS for the
airconditioning for the relay that kicks the compressor clutch?
Thanks

Great source for wiring diagrams:

Auto - Online Repair Info
http://search.ebscohost.com/
ID: rrcc
PW: rebsco
Select: Auto Repair Reference Center
Fill in: Find Your Vehicle
Follow prompts down to Wiring Diagrams.

Fuse #1 - 10a - in the battery junction box actually powers the compressor thru the AC Relay. Power to actuate the AC Relay comes off the PCM Power Relay; the actuating circuit receives power from the PCM Power Relay, which then routes thru the AC Relay actuating side to the PCM, the AC Clutch Cycle Pressure Switch and the AC Pressure Cutoff Switch to ground.

 

[nipits]

Thanks for the info.
I am also needing to know since i am replacing my evaporator and condensor coils along
with my compressor,accumulator and hoses and my system says it takes 8 ounces of PAG 46 oil should i just get a can of the liquid and pour half of it in the compressor both holes on the compressor and the other 4 ounces in the accumulator or how should i do that.
I just want to make sure since i am going to redo everything since my system got flooded with lots of teflon flakes from the compressor that i do it correctly so i don't have this problem again.
Thanks

 

[Thingster]

Have a manifold set?

What's ambient temp, what's your low side, and what's high side when you cycle the clutch?

This is if you still think you have a restriction or aren't getting pressure to the cycling switch.