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[Humpy]

Just bought another Omega for the missus and the air con doesn't work. I looked at it before but realised the air con didn't work (amongst some other niggles) and walked away. When the price came down to what I wanted to pay I bought it! Now a mate, when I mentioned about the air con said that the compressor won't cut in if there's no gas in the system. Is that right? The light comes on the switch but I can't hear a relay. Is there a relay? I checked the fuse and that seems ok, I see on another thread that there's some big fuses for the air con by the battery? Any advice would be welcome, thanks.

Humpy

[Andy B]

.... Now a mate, when I mentioned about the air con said that the compressor won't cut in if there's no gas in the system. Is that right?  .....

Correct! 

[Dave DND]

Can`t speak for your neck of the woods, but around here, Kwick-Fit are about the cheapest for re-gassing

Last one I had done was a VW Sharan - cost me £30

[Humpy]

Thanks guys, I'll give it a go then

Humpy

[dbug]

Can`t speak for your neck of the woods, but around here, Kwick-Fit are about the cheapest for re-gassing

Last one I had done was a VW Sharan - cost me £30

Didn't they break it up Dave?  Kwikfit are well known for that - they managed one of ours as well as a lot of other members' cars!!  Best to get an A/C expert - we use a mobile guy just as economic as Kwikfit but knows what he's doing!!

[Rockhampton]

Most likely to be lack of gas, but low coolant level will also stop the compressor kicking in

[Humpy]

As in low engine coolant? Why's that then?

Humpy

[Rockhampton]

I noticed this originally a few years ago with a Fiat - the heater matrix was leaking, and when the coolant dropped below a certain level, the compressor would no longer kick in until topped up. I had my Omega serviced a few weeks ago, and during the service the coolant was changed - when the car was running with the coolant low (and the coolant check warning on the MID), the compressor would not run - as soon as we topped it up to minimum, it started.

[Marks DTM Calib]

There is some coincidence there then as there is no connection betweeen the coolant level sensor and the aircon operation.

[Rockhampton]

Perhaps so - there was no conicidence on the Fiat as I traced it out on the wiring diagram and the climate ECU did check the coolant level sensor as one of its inputs.
Don't know for certain on the Omega - but JamesHoleinblockV6 was there when it happened!!!

[Andy H]

There is some coincidence there then as there is no connection betweeen the coolant level sensor and the aircon operation.

My pre-facelift (A/C not climate) used to start the ventilation and compressor as soon as you started the engine. My 2003 facelift with climate control seems to delay starting the ventilation for some time after starting the engine. Don't know what it is waiting for :-/

I don't know whether this is evidence for 'coincidence' or some link between the climate system and the MID/ECU/warning lights that isn't apparent on the wiring diagrams :-/

[Marks DTM Calib]

There is some coincidence there then as there is no connection betweeen the coolant level sensor and the aircon operation.

My pre-facelift (A/C not climate) used to start the ventilation and compressor as soon as you started the engine. My 2003 facelift with climate control seems to delay starting the ventilation for some time after starting the engine. Don't know what it is waiting for :-/

I don't know whether this is evidence for 'coincidence' or some link between the climate system and the MID/ECU/warning lights that isn't apparent on the wiring diagrams :-/

Its because its a more advanced setup, there is little point in winding up the ventilation if you want heat and the engines just been started.

An Omega has no connection between coolant level and aircon.

[espen22]

I would have checked the connections underneath the car, there is two plugs going into the aircon pipes that measures pressure and temperature on the system. theese connectors are wery exposed to destruction if the car is driven without the bottom engine plate!
And on the older models the wirings are bad, they intend to break near the connectors causing bad connection.

If this connectors are ok, i would also given one of the fillvents a little push to see if there is some gas in the system, if totally empty you might have a leak somewhere, and that leak can be in one of the quick connectors located around the system.