Thread: Air Conditioning not working, help required..........

Originally Posted by Nomad9

I've now zoomed in and made the file a .pdf format, that should allow you to play around a bit.

Thanks, I can read it now but it only infers that the system isn't cooling, which you already know.

I would be taking it to someone who knows a/c systems, preferably in a D3, to check the compressor including its clutch if it has one, any high/low pressure switches, the TX valve operation and the thermostat if it has one. My tractor's a/c stopped working seemingly abruptly but as it hadn't been touched in the 8 years of my ownership I expected the cause to be at least low on gas and possibly needing a new compressor so didn't check anything. It was only a failed thermostat - I could have determined that myself but thought it not worth even starting to look as I couldn't check the system pressure. The point is that an experienced a/c technician should find the cause.

Hi Graeme,
I have admitted defeat on this one, especially being air con, I'm at the point I suspect the compressor, feeling the joy right now, however getting the air con compressor off the petrol engine is a damn site easier than the diesel engine, I don't have to remove the diff to get it out.

I hooked up the Faultmate again and no faults on the tested scan. I was able to operate all the flaps via my computer with no problem, plus the fan speed, plus I got to witness the "fart" noise described in a earlier post.
Finding someone familiar with the D3 air con system is a bit of a challenge, I'm taking my D3 into Southerns the local LR agent to ask them to further diagnose, not fix so I know what I am up for, as you say could be something real simple, somehow I doubt it. I was hoping a fuse, yea right........!!!!
Thank you and everybody else for your assistance, I'll feedback what I find out on Friday afternoon.

My experience is in diagnosing the internal parts of the HVAC - so compressor knowledge is not so much - in my car 12E and 17E fusible links are related to HVAC. But as Graeme has said, if it's not cooling, the problem is likely to be the clutch pulley or as you say the compressor itself.

Here's two files that might help (or at least give you some light reading on the complexity of the system), the A/C details from Topix for a V6 and the HVAC control components section.

Good luck and let us know how you go !

I see that the compressor does not have a clutch, rather a solenoid that varies the compressor's displacement so that virtualy no pumping occurs. I've noted that the same style of compressor is fitted to the 2.7 and that quite a few have sheared the pulley drive due to the compressor having siezed. You should be able to confirm whether the pulley is rigid on the shaft or not.

Presumably you have confirmed that the economy switch isn't stuck on.

Edit: I note that the not-tested codes don't include any plausibility faults such as the system isn't cooling when expected.

My AC hasn't worked since i had the heads done, i know they removed some of the aircon parts to do the job but they were suppose to regas. Given i feel they ripped me off on other things i don't believe they regassed so mine is getting regassed on Thur. Be interested to see if its simply empty or has a leak or maybe some other issue. BTW it worked really well before they worked on it.

Hi Mick,
Starting to troll through the files you posted I wonder if the ambient air temperature sensor has dual functionality, the dash display and the air con system, I have noticed that recently the ambient air temperature has been moving a round a bit, one morning on the way to work the temp went down to about 4 degrees and the ice warning beeper sounded, I was wearing a T shirt so it wan't four degrees..............I wonder............. I can check that with mu faultmate......interesting.

Good luck and let us know how you go !

Hi

I am following these posts with interest. I have the same problem with my 2008 model D3. Like you I have checked all the usual stuff, I've got the TDV6 so haven't quite got to the stage of pulling the AC compressor out. I may have got on to someone who is prepared to have a look at mine so if they are successful I will let you know what they found. It may be of use, unfortunately I cant get to this guy before next week.

Cheers