Any ideas what this is?

[widdowson2008]

Just generally admiring the Bongo and checking levels when I noticed this new (to me) bit.



The pics were taken looking down at the radiator (air con)

Don't you get a little weary of suddenly finding something you aint seen before?

The obvious answer is stop poking around but I cant do that

[dandywarhol]

Don't know about the cable but the unit with the sight glass is the a/c dryer - if the a/c is working ok you should see activity in the sight glass when the engine is running and a/c switched on

[widdowson2008]

Don't know about the cable but the unit with the sight glass is the a/c dryer - if the a/c is working ok you should see activity in the sight glass when the engine is running and a/c switched on

Thanks Alan - right again - activity noted in sight glass and aircon seems to be doing its thing (cools off the cab area very well)
So.......if the sight glass (about 10mm diameter) is on the a/c dryer, what are the cables for?
There is one coming from the dryer to something off to the right, and then back from the 'something to the right' down to a 'block' on the centre stay (front or a/c rad.).....and there it stops. Could this be yet another sensor? I feel an urge coming on to grab a shovel and do a bit (more) digging.

[ptatham]

Its a high pressure switch. If your aircon pipe gets blocked (Usually at the expansion valve near the coil in the dashboard) Pressure can rise very quickly. They are usually set to 30 Bar if my memory servies me correctly. The wiring will end up somehow sending a signal to the clutch plate on the compressor, and will simply turn it off if the pressure gets too high. Hope this makes sense... Patrick (Retired Vehicle Air Con Engineer!)

[widdowson2008]

Its a high pressure switch. If your aircon pipe gets blocked (Usually at the expansion valve near the coil in the dashboard) Pressure can rise very quickly. They are usually set to 30 Bar if my memory servies me correctly. The wiring will end up somehow sending a signal to the clutch plate on the compressor, and will simply turn it off if the pressure gets too high. Hope this makes sense... Patrick (Retired Vehicle Air Con Engineer!)

Hi Patrick
Thanks for that. So it's a HP. switch. What is the reason for locating it there? Seems to be out on a limb - remote from just about everything. If the answer is complicated and can't be explained to a thickie, (like me) leave it. Just wondering thats all.

[dandywarhol]

Good to have ana/c specialist on board this place is getting to be a real hotbed of talent.................

[widdowson2008]

Good to have ana/c specialist on board this place is getting to be a real hotbed of talent.................

Agree with that one Alan........What Patrick said makes sense (speaking as someone who knows nowt about aircon) and I think there are a lot more out there - just need encouraging to join in.

[mikexgough]

yep agree with all of that, speaking from experience of changing the Air Con rad and drier bottle.... after the Pheasant episode

[widdowson2008]

Don't ya just love it when folk agree ......onward and upward

[Simon Jones]

Its a high pressure switch. If your aircon pipe gets blocked (Usually at the expansion valve near the coil in the dashboard) Pressure can rise very quickly. They are usually set to 30 Bar if my memory servies me correctly. The wiring will end up somehow sending a signal to the clutch plate on the compressor, and will simply turn it off if the pressure gets too high. Hope this makes sense... Patrick (Retired Vehicle Air Con Engineer!)

The item in the second picture is some form of sensor, probably temperature or air flow. I can't see it being a high pressure switch as it has no mechanical connection to the refrigerant . BTW, I have no experience of aircon, but have disconnect it when doing some work on the front of the van.

[widdowson2008]

Just generally admiring the Bongo and checking levels when I noticed this new (to me) bit.



The pics were taken looking down at the radiator (air con)

Asked this before. Not sure about the answers I got. (2nd pic - got an answer to the first pic)
Looked at 3 other Bongos and none of them have it. Is this the elusive Dilithium crystal?
Anybody else got one? and if so, what the hell is it

[phil 1]

Hi
Mine has one Sorry no idea what it's for

[g8dhe]

In the wiring manuals its marked as G3-25 (Electronic version) G1-09 (Manual version) and referred to as Pressure Switch Electronic/Manual A/C

Same location for the connector on both types it looks like

[widdowson2008]

In the wiring manuals its marked as G3-25 (Electronic version) G1-09 (Manual version) and referred to as Pressure Switch Electronic/Manual A/C

Cheers Geoff.
Still baffled on 4 counts.
1 - What is it for? (perhaps the earlier reply from ptatham, the air-con guy, was right after all - thanks Patrick)
2 - How does it work?
3 - Why doesn't it appear on ALL Bongos?
4 - Geoff - Do you know where it manifests itself on the wiring diagrams? That might give us a clue.

[g8dhe]

Click the images above, to go to that page in the Wiring Manual, then go back one page using the arrows at the bottom, and it gives the circuit but only as much as it feeds into the Air Con, electronics.