Air Conditioning

[jaybo]

my air con has suddenly stopped working for some unknown reason.

when i press the control button on the dash it illuminates but nothing happens, i have checked all the wiring making sure all the connecting blocks are connected.

i have checked for a live on the compressor but wherever i check cannot find one . this is leading me to think that i have a fuse / relay down, does anybody know where they are?

i have checked under the bonnet and drivers footwell fuse boxes, are there any more?

[randyreindeer]

Jaybo.

Is your compressor kicking in when the light comes on? I think they may have an inbuilt thermal link which melts if the gas gets to low in the compressor. Im not to well up on Modern air con but my older cars have this as a safety feature.

[insider]

dont know if this helps but the following will stop the a/c from working....coolant temp signal is to high...signalthat the temperature at the air outlet is low...a big difference between engine speed and compressor speed....and most likely the refigerant pressure is unusally high or low :duh:

[jaybo]

cheers for the info guys

i'm checking a few leads as we speak

1. solar sensor

2. coolant temp sensor

just had it re-gased on saturday and its not worked proper since.

when he gased it up first time it was reading high pressure so he emptied it and re-gased , everything then read fine. about an 2 hours later it all stopped

[jac114]

I think I would be taking it back saying that you think he has cause some damage to the system.. That is if it was working ok b4 it went in??

jac

[james2210]

On the MK2, you can hold the AUTO+RECIRC buttons while turning on the ignition and diagnostic codes will be flashed up in the display. Then it's just a question of asking someone with the service manuals what the damn codes mean!

[jaybo]

done that aready.

thats how i got to know about these sensors. just waiting for my buddie JAC114 to come up with some more info for me

as regards to taking it back if i see his paltry face again i wouldn't be responsable for my actions, its been in and out 6 tmes in the last 4 months with the same thing (leaking from the top of the dryer). Still don't know if the leak has stopped as i can't test it

me think it may be time for trusty old trading standards to get involved

[james2210]

Look on the bright side, at least winters on it's way!

OK, I'll shut up now!

The solar sensor can sometimes be reported if it's not in direct sunlight eg. in the garage or shade.

[jaybo]

i'll try it again during the heat of the day (joke)

i still want it to work even if winters on its way, its the principle now

any ideas what causes 'high pressures' in the system

[randyreindeer]

It can be a real pain sussing out aircon problems. I have been told that the wrong gas can turn pin holes into black holes. A good place to check for pressure leaks is the condenser. My Supras condenser fell apart after a re gas and that was caused by me being to eager to see if I could get it any cooler.

[jac114]

Lexus manual has 169 pages just on the aircon system..gulp

jac

[jaybo]

its just had a new condensor/dryer fitted !!!!!!!

[jac114]

thats a bit of a turn around from what you was looking at .. how did you get that diagnosis

jac

[jaybo]

that was fitted last saturday jac.........................

don't know where i got the information from,

but it came by carrier pidgen !!!!!!!!!!!!!!!!!!!!!!!!