P38A Air con compressor

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
pete12345

pete12345

Well-Known Member
Full Member
Posts
2,427
Location
Isle Sheppy
Can anyone tell me what is the live and negative on the denso compressor one black wire one white also the two wires from the harness to feed it one green &white the other black I’ve connected it up black to black but no clutch engagement saying that there is a leak out of one of the inlet pipes to it new washers fitted so will have to look at that just wanted to make sure it’s wiring is right also I’ve empty of gas would that stop clutch engaging thanks for advice before I proceed
 
the pressure switch would stop the a/c pump from destroying its self if no refrigeration liquid ,assuming petrol
 

Attachments

  • Electronic Troubleshooting Manual RR-P38 (LRL0086ENG)-389.png
    Electronic Troubleshooting Manual RR-P38 (LRL0086ENG)-389.png
    324.1 KB · Views: 104
I haven’t even got that bit there all I’ve got is the electrical connection
 

Attachments

  • image.jpg
    image.jpg
    317.2 KB · Views: 113
  • image.jpg
    image.jpg
    364 KB · Views: 105
Here’s what mines got and brand new but helpful about that green white wire
 

Attachments

  • IMG_1166.png
    IMG_1166.png
    1.2 MB · Views: 103
Just changed the washer not leaking now holding pressure but no cooling gas left & only 17% in car so thinking not enough to make clutch kick in any advice much appreciated will get more refrigerant couple of days and try fill it right up I’ve doesn’t work then must be wires wrong way round will check relay and fuses after filling but all switches are new
 
pete12345 said:
Just changed the washer not leaking now holding pressure but no cooling gas left & only 17% in car so thinking not enough to make clutch kick in any advice much appreciated will get more refrigerant couple of days and try fill it right up I’ve doesn’t work then must be wires wrong way round will check relay and fuses after filling but all switches are new
Click to expand...
Gauge on my refill kit shows 25 to 40% is green and good
 
Cheers mine leaked so much overnight it’s only on the white section will refill then put on the proper gauge for a few while to make sure it’s holding pressure but still not sure I’ve that would stop the clutch on compressor from engaging I’ve not it must be my dodgy wiring but thanks for the info
 
pete12345 said:
Cheers mine leaked so much overnight it’s only on the white section will refill then put on the proper gauge for a few while to make sure it’s holding pressure but still not sure I’ve that would stop the clutch on compressor from engaging I’ve not it must be my dodgy wiring but thanks for the info
Click to expand...
No pressure = no clutch engagement.
 
Got pressure now no leaks but clutch still not engaging so am assuming put the wires wrong way round will check fuses and relays 1st
 
Or your trianry switch is duff. ;). Pressure switch at the drier.

12v to make the clutch kick in if it gets cold switch is next thing to bridge but isn’t easiest to get too.

Testing purposes only don’t leave it that way.

J
 
It’s got all new switches fitted it mabey the 2 wires that connect from the harness to compressor I’ve jumped the clutch before on the old one but don’t want to do that really I’ve got 1 green&white wire 1 black from harness going to it and from compressor 1 black&1white so I’ve connected black to black green &white to white I will try check what’s positive & negative tomorrow thanks for advice
 
Quick update nanocom reading no ac grant checked pressure gone down a bit overnight jumped the clutch filled again but but with aircon running can’t seem to get above 20/22 bar but when switched of pre saying on refill bottle gauge to high as said before new trianary switch and pressure switch already fitted mabey another trip to local Indy specialist
 
pete12345 said:
Quick update nanocom reading no ac grant checked pressure gone down a bit overnight jumped the clutch filled again but but with aircon running can’t seem to get above 20/22 bar but when switched of pre saying on refill bottle gauge to high as said before new trianary switch and pressure switch already fitted mabey another trip to local Indy specialist
Click to expand...
Have you checked the compressor clutch relay (if fitted).
 
pete12345 said:
Quick update nanocom reading no ac grant checked pressure gone down a bit overnight jumped the clutch filled again but but with aircon running can’t seem to get above 20/22 bar but when switched of pre saying on refill bottle gauge to high as said before new trianary switch and pressure switch already fitted mabey another trip to local Indy specialist
Click to expand...
It should not go above 21bar or the trinary switch will open.

Static pressure needs to be > 2.4 Bar (35 psi) to allow the compressor to engage. If it goes up to 21/20 Bar (305 psi) when you apply 12V to compressor clutch, then there could be too much gas in it ?

1692180233881.png
 
With engine off both gauges should show same static pressure. With engine running, when the compressor clutch is engaged, the Blue low side should drop, and the Red high side should rise. Post pictures, not just the readings.
 
That’s static pressure will leave them on and check for leaks again thanks
 

Attachments

  • image.jpg
    image.jpg
    309.3 KB · Views: 108
Wit’s engine running the clutch doesn’t engage is that ok for the test because when I did it to fill it was saying on the bottle trigger gauge it was low but now seems high
 
You must log in or register to reply here.

Similar threads

D
Air compressor help
Replies
3
Views
719
marjon
marjon
B
L320 heated seat info
Replies
7
Views
700
Bahama66
B
M
Air compressor
Replies
12
Views
824
Mark Piercy
Mark Piercy
W
Timing case breather with compressor
Replies
3
Views
212
miktdish
miktdish
G
L322 Air Conditioning (I know I know)
Replies
4
Views
546
Girthy
G
Back
Top