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[Andy B]

... the machine is much quicker if there's nothing to drain out of it
 .....

A good point, well made!       

[biggriffin]

Presumably the system will need regassing again

o yes,have you got your vx masterfit voucher,if so get vx to do it.
or you could go to (time to get linched) halfruds get a a/c kit using your trade card,(omega uses whole tin) refill with that to check system is working,(take empty back £10 back).

[sassanach]

I not sure on the ohmygod,but on vectras of the same period you can change the low/high pressure switch's without emptying the system.

[05omegav6]

Shall investigate some more at the weekend

[Kevin Wood]

Before you change anything, try diagnosing the pressure switch (aka triple switch) by bridging the contacts.

From memory, the aircon triple switch is fed a signal from the climate panel which enables air con if the climate panel is calling for cold air. It will break this circuit if the system pressure is below the minimum pressure or above maximum pressure. This wire is colour coded black with a white tracer at the triple switch.

This signal then feeds an input to the engine ECU. If you've got a code reader that shows live data I believe you can read the level of this input from the ECU. Output from the engine ECU feeds the air conditioning relay K60 so the engine ECU can veto the use of air con in certain cnditions.

There is also a coolant temperature switch that breaks the ground connection to the air con compressor if the coolant gets too hot. This would leave the fans operating as normal, so guessing this isn't the problem.

The triple switch also has another contact (Brown / Brown with white tracer) which brings the fans up to full speed at a certain pressure.

I would try bridging the black / white wires into and out of the triple switch next.

[Kevin Wood]

By the way, it's also worth checking fuse 29.

EDIT: and fuse 52 in the engine bay fuse box, considering that pump burnt out, although it will only affect engine cooling and not air con.

[05omegav6]

Thank you for that Kevin was thinking along the same lines so that I can refit the relay if nowt else

[albitz]

Well,if you need a compressor.
http://www.ebay.co.uk/itm/330973104057?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

[05omegav6]

Well,if you need a compressor.
http://www.ebay.co.uk/itm/330973104057?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

I don't, but at that price... I might

[biggriffin]

Well,if you need a compressor.
http://www.ebay.co.uk/itm/330973104057?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

If id have seen that would have had a go, new they cost £150.
 missed a bargin there

[05omegav6]

Before you change anything, try diagnosing the pressure switch (aka triple switch) by bridging the contacts.

From memory, the aircon triple switch is fed a signal from the climate panel which enables air con if the climate panel is calling for cold air. It will break this circuit if the system pressure is below the minimum pressure or above maximum pressure. This wire is colour coded black with a white tracer at the triple switch.

This signal then feeds an input to the engine ECU. If you've got a code reader that shows live data I believe you can read the level of this input from the ECU. Output from the engine ECU feeds the air conditioning relay K60 so the engine ECU can veto the use of air con in certain cnditions.

There is also a coolant temperature switch that breaks the ground connection to the air con compressor if the coolant gets too hot. This would leave the fans operating as normal, so guessing this isn't the problem.

The triple switch also has another contact (Brown / Brown with white tracer) which brings the fans up to full speed at a certain pressure.

I would try bridging the black / white wires into and out of the triple switch next.

Tried at the switch end. No joy

Bridging the BrWs wires puts the high speed fan on, but only the drivers' side both front fans run when the clutch is connected directly to the battery, so guess one high speed fan is normal...

Fuses 29 and 52 both fine

[Kevin Wood]

That's weird. I know you can force the ECU output to pull in K60 using a Tech 2. Might be worth a try. I would also try pulling K60 and bridging the pins where its' contacts are. Should enable the compressor clutch and fans.

I think one fan on full speed would be normal in the situation you describe. The other fan requires K60 to be pulled in.

[05omegav6]

Wiring diagram received guess the pressure switch is functioning as expected.

K60 not doing anything so guess an issue with the switching feed to that connect the clutch output to the battery, the front fabs run and clutch engages...

[symes]

not being funny but how is electrical plug connecting air con----mine was smothered in oil and caused all sorts of hassle
and it can chaff through as its near sharp metal

[Kevin Wood]

Wiring diagram received guess the pressure switch is functioning as expected.

K60 not doing anything so guess an issue with the switching feed to that connect the clutch output to the battery, the front fabs run and clutch engages...

K60's feed comes from the engine ECU only a few inches away. What happens if you take the top off K60 and activate the contacts manually?