Hello again

 

The AC on my 2007 1.6 Petrol Roomster is not working.

 

I can hear a hissing sound when I press the AC button, it's a Climate one with the knobs, but no cold air comes out. The revs also jump up and down when the AC is pressed.  The fan is never turing on. I asked the local garage to see if the system is low on refrigerant and they said it's full.

 

Things I've done:

- Checked all fuses in the battery tray and under the dash.

- Bridged the thermoswitch connector to turn the fan on, and it turned on to both speeds 1 and 2.

- Scanned and got given code 01320  - Climatrinic NoSignal/Communication. But I don't have climatronic. And also a low battery signal one for same module (can't remember code sorry)

- In fuse No 10 for  AC in some countries there was no fuse. I added a 7.5 one.

- I looked for sliot wired in all of the connectors I can see related to AC but they all looked ok. I unplogged them all an plugged them back in, the moduled in the dash included.

 

I read a few forums that the module might be bad. I can try a used one for about £20 I don't mind. Any other suggestions anyone?

 

Thanks

 

Bertie

Edited 2 July, 20223 yr by Bertie90

Have you check the gas level. It probably needs re-gas. I have the same issue in my wife's 2000 Megane Coupe. It has somewhere a slight leak and it need re-gassing every summer.

The system is fully pressurised. 

The relevant cabin fuses appear to be 9 and 22, 5 Amp and 7.5 Amp respectively, ignition and permanent 12V feeds to the HVAC module.  

Can your scanner look at live data? Like G65 high pressure sensor output? or 'shutoff codes'?

 

I'm pretty sure VCDS lite will work on your car, which can be up and running very cheaply if you have a windows laptop.

Edited 7 July, 20223 yr by Breezy_Pete

8 hours ago, Breezy_Pete said:

The relevant cabin fuses appear to be 9 and 22, 5 Amp and 7.5 Amp respectively, ignition and permanent 12V feeds to the HVAC module.  

Can your scanner look at live data? Like G65 high pressure sensor output? or 'shutoff codes'?

 

I'm pretty sure VCDS lite will work on your car, which can be up and running very cheaply if you have a windows laptop.

I bought a brand new one and fitted it. I bought a used module as well and fitted it. I also bought a new thermoswitch but haven't fitted it just yet just in case. Nothing worked yet. Here is a picture of my fake vagcom reading.  Car is at idle. 

Edited 7 July, 20223 yr by Bertie90

Have you checked that the compressor shaft is actually turning, as well as the pulley? Everything you see when you look at the end of the pulley should all be rotating.

Fan action won't be triggered until refrigerant pressure exceeds 9 bar.

Yes it's all spinning, I can feel the engine working harder when I press AC. It doesn't have a clutch as some other AC compressors I've seen. 

 

Am I right refrigerant shouldn't be lost otherwise there's a leak in the system? Is it worth me replacing anything if the pressure is low? I need to book it at another garage by the looks of it. 

9 hours ago, Bertie90 said:

The system is fully pressurised. 

Fully pressurised is an interesting one. Garages are happy to throw gauges on and read a number off... doesnt mean the system has anywhere near the right amount of gas, pressure changes all the time based on lots of factors. The gas is measured in grams, if your car takes lets say 700g, if you were 100g down, the pressure gauges wouldnt look too different, but your AC wouldnt work. 

 

Really they need to pull the gas out and measure it with their machine. 

The pressure guages would indeed look very different, I have VCDS which only measures the high side pressure, a manifold guage set and a vacuum pump, what I cannot do however is remove, measure the weight of refrigerant and replace, therefore I have to watch very closely the high and low side pressures & the relationship between them together with the ambient temperature whilst consulting my charts whilst refilling or topping up.

 

If the engine was running with the aircon on full when the VCDS readings were taken then the system does not have enough refrigerant, the high side should go up to 9 bar guage pressure (probably 10 bar on VCDS) before the fans cut in and it drops whilst the low side increases again.

 

I take your point though, they wouldn't look too different but its a big difference to the trained eye but they are rarer and rarer in garages these days especially since the advent of the idiot proof so called "smart" machines that they just connect and leave to do their stuff.

I booked it with another garage for Monday. £60 to regas. Fingers crossed 

I've got AC 🙂. It was low on gas and also the old module was faulty. I got no more errors.