406oc.co.uk

this is mainly directed at D9 owners with digital climate control... just had a/c pipes
replaced and re gassed and question is does your compressor engage every time you
press the a/c button or are there times perhaps when the climate control deems it
uneccessary that it does not engage....

HI,

From what i remember from my old car every time i pressed the a/c button to turn it on or off i could always here the clicking of the a/c going on and off, the only time the a/c will not come on is when the outside temperature is below 3 degrees ( i think). My new 2001 car I cannot hear the clicking of the a/c engaging but the air con works fine. Hope this helps.

Worst case the a/c clutch mechanism is on the way out or maybe the temperature sensor is knackered (although you multi functional display would be showing the wrong temperature) other than that I have no idea.

Andy

thanks Andy ... will take it back the stealers cos thats where the work was done
and up until last week when the gas finally leaked out that is how it worked so
will see what they got to say

My compressor appears to have a life of it's own. Then again I leave the climate on Auto at 21deg pretty much all year 'round, so the thing switches itself on and off as it needs to....

Now thats what mine appears to have started doing Dai but before yesterday
i could just press the a/c button and on it came... wondering if they re charged
it properly as was like this when low on gas...

problem solved wiggled the wires going to the safety vavle sensor
thingy on the condensor .... seems to have cured it

I have studied my compressor many many times and have come to the conclusion that it does the following:

• 0 deg C or less = no compressor (protection)
  1 to 10 deg C = compressor engages on and off in cycles to suit gas pressure
  11 deg C and above = compressor runs flat out no stopping

Mines always done this. I was worried about it running flat out but it seems fine like it.

The only thing I have not tried is the auto-off function which disengages the compressor under high loads (revs) I daren't try this one

Thanks welly i have used the auto off at 70+ and the compressor
quite happily disengages ... though if you try it and anything happens
i deny all responsibility as i was not encouraging you to do the same

What's this auto-off thingammybob then?

Well i think its when you press the minus sign on the fan button
until everything is turned off so that auto or a/c are no longer
showing on the display.... think thats what welly means Dai

Nooooooo, the ECU will turn off the a/c under high engine loads to free up some more power.

If your running high revs/boost/fuelling/temps for an extended period the a/c will be switched off automatically.

As I said, I daren't try this.

I don't know about you but I never engage the compressor at any revs higher than about 2000 rpm. I just don't like the idea of it banging in at high revs.

does this include high motorway speeds over an extended period welly ????

and i have engaged disengaged mine above 2000 welly seemed to work
fine till i developed a leak

TBH I think it's more related to high coolant temps (a product of high loads) the ECU will shut the a/c down, you can come off the throttle a bit, the coolant should drop, and then your OK. If not then you will enter *phase II* of the overheating procedure

mmmmmm shall have to hope i never go into phase II then welly