265 Cup air con not working

pressure switch could be gone, cheap and easy to do yourself

 

did folk that re-gassed not make sure working correctly ?

 

If the ECU has a fault logged, say for low pressure, this will need cleated before it will work.

 

you'll need a diagnostic tool that can do air-con and that way you can read air con gas pressure

 

well it the system is making pressure and holding it shows compressor and condenser are ok so thats the expensive bits out way just left with switch so could be cheap fix

 

or could be air con compressor clutch not engaging

 

but then system wouldn't make pressure and re-gas guys should have spotted that when testing

 

yes it could if electromagnet is dead like on my espace, i had gas, at the right pressure but clutch was dead on compressor, changed compressor and he presto all working again.

 

Was post recently of someone just fitting clutch only as compressor is quite steep

 

https://rsmegane.com/threads/replacing-air-con-compressor-help.17186/

 

Yep, that was me. Wasn't too bad of a job to be honest.

First thing is the car needs to get plugged into a diagnostics machine to see if any faults are stopping the ECU sending 12v to the compressor clutch. If there are no faults logged then the wiring plug on the clutch will need checked for voltage when the AC button is pressed. If there's 12v there and the clutch isn't engaging then the clutch has failed. If there isn't 12v there and there are no faults logged then it will need deeper investigation.

 

Quality writer up, tried to find in ‘guides’ didn’t see there

 

Could be that mapping has switch aircon off, you know who mapped it ?

 

I'd be taking it to you're local Renault tuning specialist (like EFI Parts, RS Tuning, Engine Dynamics, K-tec) and getting them to check what's been done. It does sound like it's been coded out for some reason if Renault couldn't locate any of the info on their diagnostics equipment.

To confirm the system itself is all OK you could always hook up a 12v supply to the compressor. That way, with the engine running, the compressor clutch should engage and the air con should work. It would confirm it's software related, not hardware

 

Think it’s fairy common knowledge that ECU switches off the air con on all modern cars when engine is under stress and showing hi temps so not completely sure about no ECU intervention.
If system is holding pressure then must be something do with lack voltage at pump

 

Might be worth giving the guys at Stagex Motorsport a shout. They can code out airbags and retrofit the RS monitor so I'd imagine they'd be able to diagnose what's going on or has been done to yours

 

Hi Nicholas,
Have you sorted out the problem with the air con? My Magane MK3 might have the same issue. I took it to the garage to investigate the problem with the air-con. They gassed it, but the aircon still did not work. It has been plugged into the computer that did not show any issues apart from a message saying -

"Does ECU prevents airconditioner work? - Yes"

Something between these lines.

 

meganes dont run clutch in the aircon. i posted on this a couple of years ago, they are variable displacement swash units. watch here.

 

start the car look down on the front of the compressor where the pulley is. aircon does not need to switched on as it runs all the time on the megs. in the centre of the pulley is a 7mm square drive. if that is not spinning the drive centre has sheared. it will need a new drive centre. cheap and easy to fix and looks like this

 

the megs have one like this and the three legs in the centre snap. this stops drive to the compressor.

 

there is a solonoid on the rear of the compressor this activates the swash plate. when the plate is vertical the pistons pump very little. as the solonoid is activated the angle changes and more gas is pumped in. hopefully this may be your issue

 

thats the square 7mm in the centre. these are the delphi megane compressors but bmw centre drive fit. i know i fitted one 2 years ago lol

 

think that is the one

https://ttk-ac.com/en/a_c_compressor_clutch_hubs/a_c_compressor_hub_denso_7seu17c_oe83_mercedes_1

 

Sorry, My message wasn't sent on the previous post.

My aircon stopped working a couple of months back & after reading this topic and looking at the aircon compressor today, I can see that the three legs at the centre have snapped & the centre bolt doesn't rotate with the engine running.

The centre bolt rotates OK with a spanner & doesn't seem stiff / rough when rotating.

I believe these hubs are meant to shear/snap to save the auxiliary components & belt, Can tuning the cars & increasing the torque cause this over time ?

I am going to order a new drive centre hub & was wondering has anyone managed to change this with the compressor in situ & just taking off the Aux Belt ? Is there enough room ?

 

How did you get on with this.

I think I have the same issue, although I am struggling to see if the centre nut is turning when the engine is running from above.

 

I am sorry to say that I have had no time yet to see if I can manage to do it at home or not.

To check if the centre nut is turning, I took off the front inner wheel arch & it was easy to tell from there.