A/C not working... Evaporator temp @18C?

[puggy]

With the engine running reach down get hold of the wires and wiggle
them to see if the compressor kicks in .

[puggy]

Thats what happened to mine , it lasted several weeks after re-gas till it
finally stopped . Stupidly it was the last thing i checked after several hundred
pound and like welly finding out we knew more about a/c than the technicians .
During the last few weeks of said leak my compressor sounded like it would rather
be somewhere else , the gas carries the lubricant for the compressor and it had
been running dry Remove the slam panel and front grill this will give you a little
more room to look at the condensor for leaks . Also while they are off you can check
the resistor things that control the fan cos if these are bolloxed it wont work either,
they all seemed to be linked up as a safety system .Look around the pipes where the
filler caps are these can leak too !

[rwb]

Well all this is sounding familiar

I was regassed in April, then 6 weeks later it wouldn't blow cold. Evaporator temperature getting down to 14 but no further.

Had it in again yesterday. They said that 450g out of 500g was in the system (and that ought to be enough for it to work), it passed the vacuum test, so we're back to seeing how it goes. There's now 25g of dye in it.

The only other thing that I can think of is the two valves. When the system is being tested they're plugged in and so no leak can be detected.

[jonsowman]

Which year/engine is your 406 (might be a good idea to put this in your sig)?

Later full-mux cars (with Valeo BSIs) aren't fitted with relays for the air-con, they have FETs instead (sensibly). The earlier cars with Siemens BSIs (semi-mux) have relays.

Edit: Didn't read the thread properly, yours is semi-mux so does have the relay (which hopefully isn't broken!)

[Mayeux]

Hi forgive my ignorance but I have a 2001 110 hdi which displays errors time to time , battery voltage low , immobiliser fault, seat belt tensioner , which I had thought was the bsi needing a reset but as the key fob is not working put up with the errors,
Anyway took the car for a gas top up for the air con and was told it needed a compressor and valve 700 euros ! I have read a lot on this site so had a look under the bonnet the clutch was not coming in but was with 12v added
Took a while to get reveved up buy a relay and have now took out the bsi which at some point had water on it two plugs are oxidized a bit , but the downside is that it is a valeo board and all I have found on a relay change refers to siemens ?
what next? Bba remain repair for 125+vat but have been slated on here Thank you
Mayeux

[Mayeux]

Hello again I cannot find anything in english on the web but think this in french is the problem.
http://www.coupe406.com/Forum/viewtopic ... ais#859155
The relay is on ebay for very little but putting it on the board is another thing with it being smd . I think I will take the bsi back to the uk next time I go and have it done there .
Been driving a 406 since 2000 last one from new had 224k on the clock which stopped when it had a new clutch in 2007 must have done near 400k before it went , paint work was getting really scruffy but it was much more lively than the replacment a very clean 110 with 115 k on the clock it seems so slugish .
Anyway thanks your a great site
Mayeux