Octy RS Air Con Electronics

dswhite · 04-07-2005, 15:57

Hi all,

I'm hoping one of you can help me:

I've a 51 plate Octy RS which since the winter has been lacking Air Con. The Climatronic system all seems to be working, but the air coming out of the vents doesn't get cold. I assumed that the system needed a re-gas, so had a local garage to me re-gas it last week. They said that the system wasn't that low, but topped it up anyway. Unfortunately the system still doesn't work. After some detective work at lunch, I worked out that the compressor wasn't engaging. I stuck a multimeter on the two wires going to the compressor and I get a constant 9 volts irrespective of what the climatronic is set to (This doesn't seem right to me - I'd expect 12V or 0V, to engage the clutch). I decided to try running the compressor manually by putting 12 volts from the battery onto the terminals, and you could hear the compressor clutch engage. I then repeated this with the engine running and hey presto! I had cold air coming out of the vents!

Anyway, the question at the end of all this waffle is does anyone have any theorys as to why the compressor is not being engaged? I'm wondering if it could be the relay driving the compressor (I assume there is one), so if anyone knows the location of said relay that would be useful.

Plan B is to get another of my local garages to plug a VAG-COM box into it and see if it can be diagnosed.

Incidentally, I had my local Skoda garage read the fault codes from the ECU last month when a temp sensor went, and there was no other faults logged, so whatever the problem is it's not been detected by the ECU!

Any help or suggestions would be gratefully recieved!

David

ScoobyChris · 06-07-2005, 10:16

Not sure if it's the same as the Octy, but my Fabia's "Evaporator Temp Sensor" packed up which meant that the car didn't engage the air con. It showed up on VAG-COM as a sporadic fault though!

Chris

dswhite · 06-07-2005, 17:34

Thanks for the reply. I think it might be something like that. I've had one temp. sensor on the engine pop a few months ago - these sensors don't seem to be hugely reliable!

I think i'll have to get a cable shoved up it and see what it says.

Dave

dswhite · 25-07-2005, 20:12

Just in case anyone else gets a similar problem to this, here's the suspected problem:

After some poking around by an air con specialist, it appears a relay that controls the air con (Part no. W1J0 919 506 K @ £87.68 - I think it's more than just a relay by the price) had popped it's cloggs. It was replaced and the air con could be turned on via this relay under the bonnet. However the climatronic was still unable to turn the AC on. Apparently, the mechanic had seen this happen before - when the relay goes it blows the circuit in the climatronic module that activates it. A new one is £315 + VAT, but I've just aquired a used one from ebay for £30. I'll let you all know if it solves the air con when it arrives in a few days.

Dave

**mannyo** · 25-07-2005, 21:01

Keep us all posted, sure sounds like a weird problem.

Lummox · 25-07-2005, 23:07

Do me a quick favour. On the two pin plug on top of the compressor with a test light probe one of the connectors and see if you get 12v. If you do connect up the other wire to earth and with it all plugged in operate the a/c and see what happens. What often happens is the earth that goes from that unit across the top of the starter motor breaks and the compressor looses its earth.

drlargepants · 17-03-2008, 19:32

I think I have the same issue. I've just had the compressor replaced, and the aircon still isn't working.

Where's the best place to start, vagcom ?

superfredin · 18-03-2008, 01:50

hi. check secret codes for climatronic...

drlargepants · 18-03-2008, 20:38

OK, which ones should I look at ? The temp values look OK

Theresias · 18-03-2008, 21:24

Start checking the shut-off codes i the meas. blocks and the refrigerant pressure. Those are usually a good start and give you a detailed clue what the problem is.

drlargepants · 19-03-2008, 08:27

Is there a list of all the codes anywhere, the one I have doesn't seem to include what you mention ?

kenny rsell · 20-03-2008, 13:51

Found this on here previously,might be of some help

drlargepants · 23-03-2008, 09:54

thanks

drlargepants · 30-03-2008, 16:17

I get 6 volts at the compressor regardless of if the aircon is on or not. Any ideas ?

Theresias · 30-03-2008, 16:33

The voltage doesn't matter much because it only tells you what you already know, the compressor doesn't come on. The real question is why doesn't it come on and that's what the shut off codes tell you!

drlargepants · 30-03-2008, 18:48

OK here are the results of the codes from the climatronic unit

There is no pressue in the refrigerant as (apparently) you need the compressor to engage to draw the refrigerant in so there is hardly any in there now

Theresias · 30-03-2008, 18:59

Maybe you should use a real diagnostic tool or let somebody deal with this who has access to one, we have seen enough cases by now where the button-play-codes were misleading at best... Who tells you that the list you refer to is correct for your model? Nobody because no official repair manual contains them and they are all hear say.

drlargepants · 30-03-2008, 19:59

i have vagcom,\ but i haven't got a clue what i'm looking at. It detects the inteface, but doesn't seem to retur anything when you do an autoscan

DizMeisTa · 01-04-2008, 23:47

these prices and all this debate gets me worried about my octy vrs. doesnt blow cold either!!!

drlargepants · 02-04-2008, 09:05

Get it looked at ASAP, may just be low on gas. Thing is I replaced the compressor on mine having been told that it was FUBAR by the garage, but now it would seem its something electrical. Not best pleased!

04-07-2005, 15:57	#1
dswhite Briskodian Join Date: Mar 2004 Posts: 10 Thanks: 0 Thanked 1 Time in 1 Post	Octy RS Air Con Electronics Hi all, I'm hoping one of you can help me: I've a 51 plate Octy RS which since the winter has been lacking Air Con. The Climatronic system all seems to be working, but the air coming out of the vents doesn't get cold. I assumed that the system needed a re-gas, so had a local garage to me re-gas it last week. They said that the system wasn't that low, but topped it up anyway. Unfortunately the system still doesn't work. After some detective work at lunch, I worked out that the compressor wasn't engaging. I stuck a multimeter on the two wires going to the compressor and I get a constant 9 volts irrespective of what the climatronic is set to (This doesn't seem right to me - I'd expect 12V or 0V, to engage the clutch). I decided to try running the compressor manually by putting 12 volts from the battery onto the terminals, and you could hear the compressor clutch engage. I then repeated this with the engine running and hey presto! I had cold air coming out of the vents! Anyway, the question at the end of all this waffle is does anyone have any theorys as to why the compressor is not being engaged? I'm wondering if it could be the relay driving the compressor (I assume there is one), so if anyone knows the location of said relay that would be useful. Plan B is to get another of my local garages to plug a VAG-COM box into it and see if it can be diagnosed. Incidentally, I had my local Skoda garage read the fault codes from the ECU last month when a temp sensor went, and there was no other faults logged, so whatever the problem is it's not been detected by the ECU! Any help or suggestions would be gratefully recieved! David

06-07-2005, 10:16	#2
ScoobyChris Briskodian Join Date: Mar 2003 Location: Andover Posts: 18,099 Thanks: 15 Thanked 323 Times in 281 Posts	Not sure if it's the same as the Octy, but my Fabia's "Evaporator Temp Sensor" packed up which meant that the car didn't engage the air con. It showed up on VAG-COM as a sporadic fault though! Chris __________________ Holding up the traffic in a little Italian..........

25-07-2005, 20:12	#4
dswhite Briskodian Join Date: Mar 2004 Posts: 10 Thanks: 0 Thanked 1 Time in 1 Post	A Result...Sort of... Just in case anyone else gets a similar problem to this, here's the suspected problem: After some poking around by an air con specialist, it appears a relay that controls the air con (Part no. W1J0 919 506 K @ £87.68 - I think it's more than just a relay by the price) had popped it's cloggs. It was replaced and the air con could be turned on via this relay under the bonnet. However the climatronic was still unable to turn the AC on. Apparently, the mechanic had seen this happen before - when the relay goes it blows the circuit in the climatronic module that activates it. A new one is £315 + VAT, but I've just aquired a used one from ebay for £30. I'll let you all know if it solves the air con when it arrives in a few days. Dave

25-07-2005, 21:01	#5
mannyo BRISKODA Staff Join Date: Nov 2002 Location: Stevenage Herts. Posts: 10,743 Thanks: 26 Thanked 266 Times in 249 Posts	Keep us all posted, sure sounds like a weird problem. __________________ Manny 2005 Octavia 2.0TDi Elegance combi my skoda website http://www.octaviars.co.uk Join the briskoda.net folding team click Here for more info

25-07-2005, 23:07	#6
Lummox Hairy Yeti Join Date: Sep 2003 Location: Newport Pagnell Posts: 21,392 Thanks: 19 Thanked 572 Times in 500 Posts	Do me a quick favour. On the two pin plug on top of the compressor with a test light probe one of the connectors and see if you get 12v. If you do connect up the other wire to earth and with it all plugged in operate the a/c and see what happens. What often happens is the earth that goes from that unit across the top of the starter motor breaks and the compressor looses its earth. __________________ Unit 18 now open Servicing, repairs, modifications you name it we do it. Cupra console bushes at special price, PM for a very competitive quote.

06-07-2005, 17:34	#3
dswhite Briskodian Join Date: Mar 2004 Posts: 10 Thanks: 0 Thanked 1 Time in 1 Post	Thanks for the reply. I think it might be something like that. I've had one temp. sensor on the engine pop a few months ago - these sensors don't seem to be hugely reliable! I think i'll have to get a cable shoved up it and see what it says. Dave

17-03-2008, 19:32	#7
drlargepants Briskodian Join Date: May 2006 Posts: 130 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics I think I have the same issue. I've just had the compressor replaced, and the aircon still isn't working. Where's the best place to start, vagcom ? __________________ Dougal: "God, I've heard about those cults Ted. People dressing up in black and saying Our Lord's going to come back and save us all." Ted: "No, Dougal, that's us. That's Catholicism."

18-03-2008, 01:50	#8
superfredin Briskodian Join Date: Oct 2007 Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics hi. check secret codes for climatronic... __________________ Octavia 2 RS TDi. 1000km and DPF one time cleaned...

18-03-2008, 20:38	#9
drlargepants Briskodian Join Date: May 2006 Posts: 130 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics OK, which ones should I look at ? The temp values look OK __________________ Dougal: "God, I've heard about those cults Ted. People dressing up in black and saying Our Lord's going to come back and save us all." Ted: "No, Dougal, that's us. That's Catholicism."

18-03-2008, 21:24	#10
Theresias Briskodian Join Date: Apr 2006 Location: Mid Germany Posts: 393 Thanks: 0 Thanked 27 Times in 24 Posts	Re: Octy RS Air Con Electronics Start checking the shut-off codes i the meas. blocks and the refrigerant pressure. Those are usually a good start and give you a detailed clue what the problem is. __________________ Sebastian

19-03-2008, 08:27	#11
drlargepants Briskodian Join Date: May 2006 Posts: 130 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics Is there a list of all the codes anywhere, the one I have doesn't seem to include what you mention ? __________________ Dougal: "God, I've heard about those cults Ted. People dressing up in black and saying Our Lord's going to come back and save us all." Ted: "No, Dougal, that's us. That's Catholicism."

23-03-2008, 09:54	#13
drlargepants Briskodian Join Date: May 2006 Posts: 130 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics thanks __________________ Dougal: "God, I've heard about those cults Ted. People dressing up in black and saying Our Lord's going to come back and save us all." Ted: "No, Dougal, that's us. That's Catholicism."

30-03-2008, 16:17	#14
drlargepants Briskodian Join Date: May 2006 Posts: 130 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics I get 6 volts at the compressor regardless of if the aircon is on or not. Any ideas ? __________________ Dougal: "God, I've heard about those cults Ted. People dressing up in black and saying Our Lord's going to come back and save us all." Ted: "No, Dougal, that's us. That's Catholicism."

30-03-2008, 16:33	#15
Theresias Briskodian Join Date: Apr 2006 Location: Mid Germany Posts: 393 Thanks: 0 Thanked 27 Times in 24 Posts	Re: Octy RS Air Con Electronics The voltage doesn't matter much because it only tells you what you already know, the compressor doesn't come on. The real question is why doesn't it come on and that's what the shut off codes tell you! __________________ Sebastian

30-03-2008, 18:59	#17
Theresias Briskodian Join Date: Apr 2006 Location: Mid Germany Posts: 393 Thanks: 0 Thanked 27 Times in 24 Posts	Re: Octy RS Air Con Electronics Maybe you should use a real diagnostic tool or let somebody deal with this who has access to one, we have seen enough cases by now where the button-play-codes were misleading at best... Who tells you that the list you refer to is correct for your model? Nobody because no official repair manual contains them and they are all hear say. __________________ Sebastian

30-03-2008, 19:59	#18
drlargepants Briskodian Join Date: May 2006 Posts: 130 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics i have vagcom,\ but i haven't got a clue what i'm looking at. It detects the inteface, but doesn't seem to retur anything when you do an autoscan __________________ Dougal: "God, I've heard about those cults Ted. People dressing up in black and saying Our Lord's going to come back and save us all." Ted: "No, Dougal, that's us. That's Catholicism."

01-04-2008, 23:47	#19
DizMeisTa Briskodian Join Date: Mar 2008 Location: Settle/Skipton Posts: 133 Thanks: 2 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics these prices and all this debate gets me worried about my octy vrs. doesnt blow cold either!!!

02-04-2008, 09:05	#20
drlargepants Briskodian Join Date: May 2006 Posts: 130 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Octy RS Air Con Electronics Get it looked at ASAP, may just be low on gas. Thing is I replaced the compressor on mine having been told that it was FUBAR by the garage, but now it would seem its something electrical. Not best pleased! __________________ Dougal: "God, I've heard about those cults Ted. People dressing up in black and saying Our Lord's going to come back and save us all." Ted: "No, Dougal, that's us. That's Catholicism."

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