Hi all,
So, despite having some more modern vehicles in the fleet, I really want to drive the 405 to the south of France next year.....
However, my wife is telling me there is no way she will be doing this if we don't have air con.
I've never given the air con a second thought to be honest, as when I press the switch nothing happens. The light illuminates but that's it....
I've checked the fuse and it's fine.
Please could somebody point me in the right direction of how to check the basics? I would really like to get it working if poss....
Thanks again,
Will
405 diesel - air con too much to hope for?
Moderator: RichardW
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Re: 405 diesel - air con too much to hope for?
aircon is on the of things I would take to a specialist - they can leak test the system and diagnose faults properly
Simon
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Re: 405 diesel - air con too much to hope for?
Thanks - I would like to check basics are ok before thinking about regassing system / checking for leaks
i.e. Is compressor clutch seized (how do I check that?) / I can't hear any relay clicking in or out when I press button etc. I guess I should be able to hear one and, if so, where is it located so I can check..? Etc...
Thanks again
Will
i.e. Is compressor clutch seized (how do I check that?) / I can't hear any relay clicking in or out when I press button etc. I guess I should be able to hear one and, if so, where is it located so I can check..? Etc...
Thanks again
Will
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Re: 405 diesel - air con too much to hope for?
Generally when you press the AC button and the engine is running you'll hear a loud(ish) click as the compressor clutch cuts in.
If you wanted to test this (please be aware of the dangers of fingers and drivebelts) if you can somehow rig a multimeter to the plug on the compressor either plugged in or not. With the engine running and the AC "off" there should be no voltage typically. With the engine running and the AC "on" there should be 12v or so at the plug itself.
If this 'test' passes, I'd have the system checked for leaks (I think they can test by filling with relatively harmless nitrogen now just to see if its leaking) then if its OK leakwise then have it refilled properly.
I'm not sure on the gas type for these, I seem to recall they buried one of the service ports for the AC underneath but this may be the very early 405, the first shape.
If there's insufficient gas pressure the compressor will never be signalled to engage = no click or anything other than the light on the button.
Regarding testing the compressor clutch, the only way I really can think of is this: Take the drivebelt off (important) and without the engine running turn the compressor pulley, it should rotate very easily indeed. Now apply 12 to the compressor (again engine off!) it should now be quite difficult (ish) to turn as its driving the internals. If the above previous voltage tests pass you could probably just use the button for the 12v feed, but I'm not 100% if it will apply voltage without it running and you cannot safely do this with it running.
If you wanted to test this (please be aware of the dangers of fingers and drivebelts) if you can somehow rig a multimeter to the plug on the compressor either plugged in or not. With the engine running and the AC "off" there should be no voltage typically. With the engine running and the AC "on" there should be 12v or so at the plug itself.
If this 'test' passes, I'd have the system checked for leaks (I think they can test by filling with relatively harmless nitrogen now just to see if its leaking) then if its OK leakwise then have it refilled properly.
I'm not sure on the gas type for these, I seem to recall they buried one of the service ports for the AC underneath but this may be the very early 405, the first shape.
If there's insufficient gas pressure the compressor will never be signalled to engage = no click or anything other than the light on the button.
Regarding testing the compressor clutch, the only way I really can think of is this: Take the drivebelt off (important) and without the engine running turn the compressor pulley, it should rotate very easily indeed. Now apply 12 to the compressor (again engine off!) it should now be quite difficult (ish) to turn as its driving the internals. If the above previous voltage tests pass you could probably just use the button for the 12v feed, but I'm not 100% if it will apply voltage without it running and you cannot safely do this with it running.
Andy.
91 205D-Turbo, gone but still missed
02 106D, TUD5B, gone but not really missed apart from the MPG
91 205D-Turbo, gone but still missed
02 106D, TUD5B, gone but not really missed apart from the MPG
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Re: 405 diesel - air con too much to hope for?
Brill - thanks spider - I will test and report back...
Will
Will
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Re: 405 diesel - air con too much to hope for?
You're welcome.
I think (guessing a bit to be honest on a 405) the bitron sensor 'box' effects this too, as when you're driving along with the AC on the compressor will cut in and out on these models, so something (bitron) is controlling this.
My personal thoughts though are to check there's power to the compressor and that its not seized (unlikely as the belt may be whipped off by this!) and then if there's power there, have it gas checked.
As a random note, 405's do usually have pollen filters too. Figuring this might be in need of a change. I think its under the scuttle panel on the nearside on these.
EDIT... 97 LX ? one of the very last ones and they were very good too, the minor issues were all fixed. At random speculation you are going to have the greyish velour seating (that was previously GTX only) or the black edged coloured fleck pattern (that previously was GLX only) , the LX got 'higher spec' trim on the "last run"
I think (guessing a bit to be honest on a 405) the bitron sensor 'box' effects this too, as when you're driving along with the AC on the compressor will cut in and out on these models, so something (bitron) is controlling this.
My personal thoughts though are to check there's power to the compressor and that its not seized (unlikely as the belt may be whipped off by this!) and then if there's power there, have it gas checked.
As a random note, 405's do usually have pollen filters too. Figuring this might be in need of a change. I think its under the scuttle panel on the nearside on these.
EDIT... 97 LX ? one of the very last ones and they were very good too, the minor issues were all fixed. At random speculation you are going to have the greyish velour seating (that was previously GTX only) or the black edged coloured fleck pattern (that previously was GLX only) , the LX got 'higher spec' trim on the "last run"
Andy.
91 205D-Turbo, gone but still missed
02 106D, TUD5B, gone but not really missed apart from the MPG
91 205D-Turbo, gone but still missed
02 106D, TUD5B, gone but not really missed apart from the MPG
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Re: 405 diesel - air con too much to hope for?
I would speculate that your system is out of gas. There will be a pressure switch mounted on the drier, 2 sets of contacts and 4 wires. Normally (with gas in the system) one set of contacts is closed, if the system is empty both sets of contacts are open. You should be able to check the switch to see if it thinks that there is gas in the system.
I would recommend spending the £50 or whatever to get a regas before spending to much time tinkering with the rest of the system, which is generally pretty reliable.
I would recommend spending the £50 or whatever to get a regas before spending to much time tinkering with the rest of the system, which is generally pretty reliable.
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Re: 405 diesel - air con too much to hope for?
I thought the pressure switch inhibited all further actions if the system was low/empty.
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Dave
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2011 Peugeot 3008 1.6hdi Exclusive EGS.
'04 C5 auto estate 2.2 hdi. Gone.
Bx 1.6 TGS Auto 50k A rare beast by all accounts. A bit tired but getting better by the day. Gone.
'96 XM 2.5TD VSX.......Sadly sold. What an idiot! I should have held on to that.