MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: muff1991 on July 10, 2019, 03:46:03 pm

Title: Another Air con Issue :)
Post by: muff1991 on July 10, 2019, 03:46:03 pm
Hi All,
after help as air con isn't my strongest point:
So my air con hasn't worked at all since I've owned the car. when i turn econ off it didnt do nothing. scanned with VCDS and got the below error:
00229 - Refrigerant Pressure: 002 Lower Limit Exceeded

 Possible Causes
 Refrigerant System undercharged
 Weak compressor / clutch
 Stuck open Expansion Valve
 Refrigerant Pressure Sensor

 Possible Solutions
 Use a Gauge Set to check Low and High pressures
 Recover and Recharge Refrigerant to proper charge level (refer to vehicle label)
 Check Compressor / clutch
 Check Expansion Valve
 Refrigerant Pressure Sensor:  Check Measuring Value Blocks
 Check wiring, connections
 Check for leak at sensor connector)

I have had the system drained, pressure tested and re-gassed... all went fine and completed ok.

Now when i turn econ off (air con - on) the engine kicks / revs change like the air cons working.. but its not blowing any cold air. The vent temps don't change at all. i see some of the above ideas and possible solutions, but to be honest they don't really make sense to me. Any ideas in layman's terms?

Compressor? Pressure switch? - although i would of thought these are working if its "kicking in" or is that the ECU bumping the revs as air cons now on.
Title: Re: Another Air con Issue :)
Post by: Horatio on July 10, 2019, 03:51:02 pm
Try the solenoid valve, common failure point.
Title: Re: Another Air con Issue :)
Post by: muff1991 on July 10, 2019, 04:32:58 pm
Try the solenoid valve, common failure point.
This was one of the first things that come to mind, is there a way of testing it before replacing? as I guess it'll need another re-gas after?
Title: Re: Another Air con Issue :)
Post by: GVK on July 10, 2019, 07:23:55 pm
High pressure switch is common, and can be changed without losing refrigerant, it has a schrader valve type fitting on it which unscews from the pipe.
Title: Re: Another Air con Issue :)
Post by: muff1991 on July 11, 2019, 11:39:58 am
thanks mate, I'll give that a go then  :happy2:
Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 11, 2019, 03:00:32 pm
Guys out of curiosity what area of VCDS did you check for AC issues as I have an intermittent issue whereby the AC blows hot at first then after 5-10 mins is fine. Not over familiar with the navigation of VCDS so any help appreciated

TIA
Louie
Title: Re: Another Air con Issue :)
Post by: muff1991 on July 11, 2019, 03:24:49 pm
Guys out of curiosity what area of VCDS did you check for AC issues as I have an intermittent issue whereby the AC blows hot at first then after 5-10 mins is fine. Not over familiar with the navigation of VCDS so any help appreciated

TIA
Louie
Louie, its in the HVAC module on VCDS
Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 11, 2019, 06:34:53 pm
Guys out of curiosity what area of VCDS did you check for AC issues as I have an intermittent issue whereby the AC blows hot at first then after 5-10 mins is fine. Not over familiar with the navigation of VCDS so any help appreciated

TIA
Louie
Louie, its in the HVAC module on VCDS
Top man. Gonna have a look now


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Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 11, 2019, 07:28:44 pm
Well I’ve run VCDS in HVAC mode and no codes found. I’m no thinking it may need re gassing. Need to look back at the mass of bills to see when it was last done.


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Title: Re: Another Air con Issue :)
Post by: muff1991 on July 12, 2019, 08:23:41 am
i have no cold air at all, when set to cold it just blows ambient air as if the air cons off. i need to replace the high pressure switch, but to be honest I'm a little sceptical, as it seems as though its kicking in, just not blowing cold air. i have a feeling it could be the compressor. if the high pressure switch wasn't working, id have thought i'd have a code or the air con wouldn't act as though its kicking in. something i want and need to sort, but head gasket went on my touran so I have bigger fish to fry right now, this is a little something in the background while waiting on my head being pressure tested.
Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 12, 2019, 11:21:30 am
But if no codes and showing in VCDS then would that elude to the system needing to be re gassed? I assume that the need for re gassing wouldn’t cause any codes? If the compressor or any other electromechanical parts were playing up wouldn’t VCDS detect those and show the codes??


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Title: Re: Another Air con Issue :)
Post by: muff1991 on July 12, 2019, 01:46:52 pm
Well you’d like to think so yes but does any diagnostic software pick up everything.. unfortunately not!

Mine wasn’t working at all, then since the regas and leak test, it now kicks in. Just doesn’t blow cold air.

From what I’ve read, if the gas is low the air con won’t kick in.. and due to my error code up top about the pressure low.. it all made sense why it’s now kicking in since a regas.

The problem is, no cold air being blown through. Defo think it’s more compressor, solenoid or high pressure switch. I’ll have a poke around with VCDS over the weekend and see if I can see anything obvious. Once I get it going I can then look forward to the part where I moan it isn’t cold enough and the condenser is buggered too haha!
If you look online about generic air con systems, It doesn’t look too difficult, (I’m learning) just a balls ache rectifying the issue.


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Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 12, 2019, 02:22:29 pm
Well, Low & Behold. I just drove the car. First 5 mins, no A/C and just felt like ambient air, then after turning on and off, depressing the buttons to divert air between dash and footwell, turning from auto to manual, Cold A/C started :grin:. I am taking to a mates garage later and he will recharge the AC gas. Freemans to me so let's see if that helps, but like you say keep us posted on your findings and hopefully, we will both crack this!!!
Title: Re: Another Air con Issue :)
Post by: muff1991 on July 12, 2019, 04:34:34 pm
i hope we crack it before the hot weathers done  :signLOL: let us know what you find Louie  :happy2:
Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 12, 2019, 05:16:26 pm
Just heading out to pals garage now. Will update later


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Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 13, 2019, 03:20:39 pm
Well ac was re gassed. Wasn’t overly low, but had it re charged. This morning when I went out in the car it again took 3 miles and 8 minutes, constantly adjusting the ac controls before cold air kicked in.
I emailed that guy that did my REVO STG2 and he stated

It sounds like you have had a flap motor seized not letting the cool air out its quite common they can some times put a fault code in if you scan it with VCDS

So fook knows what my issue is


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Title: Re: Another Air con Issue :)
Post by: muff1991 on July 13, 2019, 10:03:07 pm
That’s a new one.. what’s the flap motor he’s referring too? Does he mean the cold to hot motor flaps?
Have you changed your high pressure switch or compressor solenoid?


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Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 14, 2019, 09:57:28 am
Hi bud
Yeah I think you’re right re the hot to cold flaps. I’ve not changed the high pressure switch and that’s my next job as it’s easy. What’s the other compressor solenoid do and where is it located?


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Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 14, 2019, 10:10:52 am
Hi dude - think I have sussed the issue as this vid is exactly what's happening to me



Methinks a trip to eBay to get a compressor solenoid switch is on the cards :-)
Title: Re: Another Air con Issue :)
Post by: muff1991 on July 14, 2019, 11:01:49 am
Yeah that’s the solenoid, apparently that’s another common failure. I did have a play with my controls like you did but nothing on mine!


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Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 14, 2019, 01:25:52 pm
Ok just purchased one of these. Now can this be installed without having to drain the ac gas or having to do anything other than the video??


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Title: Re: Another Air con Issue :)
Post by: muff1991 on July 14, 2019, 01:27:43 pm
Solenoid change needs the gas extracted and the high pressure switch doesn’t


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Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 14, 2019, 02:23:20 pm
Thanks, bud, yeah just re-watched the vid!!! Now how can I tell, without pulling the inner arch out if the valve is a bolt on or secured by the clamp ring? I think its a clamp ring but can anyone confirm?

https://rkxtech.com/collections/air-conditioning/products/rkx-ac-compressor-control-solenoid-valve-for-sanden-pxe16-pxe13-bolt-down-style

https://rkxtech.com/collections/air-conditioning/products/sanden-pxe16?variant=25079762569
Title: Re: Another Air con Issue :)
Post by: FJB on July 14, 2019, 05:38:30 pm
Before you purchase a solenoid check the data badge on your compressor. The GTI comes fitted with 3 different compressors, Zexel, Denso & Sanden, the solenoid valves are not interchangeable, i.e. if you have a Zexel you need a Zexel solenoid.
Title: Re: Another Air con Issue :)
Post by: muff1991 on July 18, 2019, 03:54:05 pm
Before you purchase a solenoid check the data badge on your compressor. The GTI comes fitted with 3 different compressors, Zexel, Denso & Sanden, the solenoid valves are not interchangeable, i.e. if you have a Zexel you need a Zexel solenoid.
i didn't know this, ive seen videos of people fixing them with solenoid that was shorter
Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 18, 2019, 04:07:41 pm
Before you purchase a solenoid check the data badge on your compressor. The GTI comes fitted with 3 different compressors, Zexel, Denso & Sanden, the solenoid valves are not interchangeable, i.e. if you have a Zexel you need a Zexel solenoid.

Thanks dude
I didn’t know this. Saw on YouTube that the guy changed his with the RKX solenoid which was longer and better quality? I may leave this anyway as looking to swap engine to a BYD


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Title: Re: Another Air con Issue :)
Post by: muff1991 on July 18, 2019, 04:17:31 pm
well i plugged VCDS in again today: had the same code pop up again (Refrigerant pressure low) i had an error code in the compressor status "number 3" which means compressor off because: refrigerant is too low.

the refrigerant pressure displayed 0.0bar  :surprised: which is weird because i had it cycled on the machine last week. extract,  pressure test (passed) then a re-gas.

come to think of it, i swear i see a dusting of white smoke the other day, but wasn't sure if i was seeing things in the sunlight lol. the air con wont turn on now (obvs because its too low) so i need to get another pressure test done because I'm now thinking: maybe the low and high pressures are wrong for whatever reason? and have blown a hole in something.  :thinking:
Title: Re: Another Air con Issue :)
Post by: FJB on July 18, 2019, 05:29:39 pm
Before you purchase a solenoid check the data badge on your compressor. The GTI comes fitted with 3 different compressors, Zexel, Denso & Sanden, the solenoid valves are not interchangeable, i.e. if you have a Zexel you need a Zexel solenoid.
i didn't know this, ive seen videos of people fixing them with solenoid that was shorter

The Sanden copies that are on eBay may fit the Denso Compressors as the are very similar, but will not fit the Zexel.

The model number for Sanden is PXE16 and Zexel DCS17E.
Title: Re: Another Air con Issue :)
Post by: Gtcpaul1971 on July 20, 2019, 02:17:36 pm
I have the same issue. Garage told me it was the flap motor £200 To replace. I bought a second hand one off a nice chap on here for £10 and going to do it myself, but haven't got round to fitting it,  going to next week
Title: Re: Another Air con Issue :)
Post by: ljc19630 on July 20, 2019, 02:57:28 pm
I have the same issue. Garage told me it was the flap motor £200 To replace. I bought a second hand one off a nice chap on here for £10 and going to do it myself, but haven't got round to fitting it,  going to next week

Interesting as thats what the guy who did my Revo map said - Quote

Hi Louie

It sounds like you have had a flap motor seized thats not letting the cool air out. its quite common they can some times put a fault code in if you scan it with VCDS

However as i stated on here a few times i'm getting no codes when scanning with VCDS, Hadnt drove the car for a week till today and its been in garage. Used it earlier and from the get go AC was blowing cold :thinking: :thinking:
Title: Re: Another Air con Issue :)
Post by: Gtcpaul1971 on July 20, 2019, 06:36:17 pm
I have the same issue. Garage told me it was the flap motor £200 To replace. I bought a second hand one off a nice chap on here for £10 and going to do it myself, but haven't got round to fitting it,  going to next week

Interesting as thats what the guy who did my Revo map said - Quote

Hi Louie

It sounds like you have had a flap motor seized thats not letting the cool air out. its quite common they can some times put a fault code in if you scan it with VCDS

However as i stated on here a few times i'm getting no codes when scanning with VCDS, Hadnt drove the car for a week till today and its been in garage. Used it earlier and from the get go AC was blowing cold :thinking: :thinking:


I have no fault codes either
Title: Re: Another Air con Issue :)
Post by: Courland on June 23, 2021, 01:52:18 pm
Why don't you just call a specialist to solve the problem with the air conditioner? Besides, you say that this is not your strong point. You're just wasting your time solving a problem that you don't know how to solve anyway. The reason for the malfunction of the air conditioner can be absolutely unpredictable trifles. I also do not understand air conditioners from the word at all. When I buy a new air conditioner, I just buy the service with the air conditioner. In case of any problem, I can just call, and specialists will arrive in a few hours and do everything necessary.

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