[AMG Power]

Originally Posted by svsantosh

Skoda AC issue is not as simple as a condensor leak or compressor going weak. Get a laptop + knowledgeable AC mechanic to check the car.

That’s what unethical FNG’s and some ASC’s would have you believe. It’s as simple or as difficult as any other HVAC system.

The only difference with Skodas is the placement of the components which make it difficult to access for repair - Thermostat and related components are behind the dashboard - so one has to remove the entire dashboard / compressor is low down below the engine so one has to remove the mudguard covers to access the compressor etc.

There is no need for a laptop - as mentioned in my earlier post, the only indication in the VCDS is a fault in the HVAC system and nothing else.

In addition, Skoda’s recommended procedure for HVAC diagnosis followed by ASC’s is convoluted which make it expensive. Such a procedure is unnecessary.

So check out with a reliable HVAC repair FNG. (reliable - thats the real difficult part).

[zaiddroid]

Originally Posted by AMG Power

That’s what unethical FNG’s and some ASC’s would have you believe. It’s as simple or as difficult as any other HVAC system.

The only difference with Skodas is the placement of the components which make it difficult to access for repair - Thermostat and related components are behind the dashboard - so one has to remove the entire dashboard / compressor is low down below the engine so one has to remove the mudguard covers to access the compressor etc.

There is no need for a laptop - as mentioned in my earlier post, the only indication in the VCDS is a fault in the HVAC system and nothing else.

In addition, Skoda’s recommended procedure for HVAC diagnosis followed by ASC’s is convoluted which make it expensive. Such a procedure is unnecessary.

So check out with a reliable HVAC repair FNG. (reliable - thats the real difficult part).

Can I meet you if you are in Bangalore? Probably you can help me solve this problem. I'm sure its minor and people in the garages are scamming me.

[Jeroen]

The first thing you need to do when encountering these sort of problems with an AC system is to check the charge and pressures in the system. If you are low on charge or if the in outlet pressures are way off, that needs to be investigated.

Off hand your symptoms suggest a problem with the expansion valve. When it goes bad the evaporator starts to freeze over. Stopping the engine/ AC for a little wheel lets it defrost and the cycle starts again.

Did you restart immediately and was the problem gone, or did you wait a little while.

I assume that the thermostat AMG Power is referring to, is in fact the expansion valve. It’s sometimes called thermostat but it doesn’t control any temperature as such.

Such a fault is unlikely to generate any error codes.

You need a real AC technician with the correct tools/manifold and monometers and knowledge about what pressure readings you should be looking at.

Sorry to say but it appears that everything was done so far, was done without any proper diagnostic approach. Just swap out parts and see what happens. Expensive, time consuming and usually highly irritating way of dealing with these issues.

Good luck
Jeroen

[AMG Power]

Originally Posted by zaiddroid

Can I meet you if you are in Bangalore? Probably you can help me solve this problem. I'm sure its minor and people in the garages are scamming me.

Thanks for the vote of confidence. What I can do is possibly help you out here on the forum which may help others too.

Option 1: I will need to have some inputs about your car to assess its background and general condition. If you are okay with that please let me have the following information:

1. How long you have had the car? Are you the first owner or has the car been through multiple ownerships, if so how many?

2. Who do you normally take the car to for service and what was their response on the fault with the A/c?

3. If you have had the car long enough, do you normally face component failures and if so, what have they been and how did you resolve those issues?

4. Please post a pic of your engine compartment and dashboard.

Based on the above, we can take a call on the next steps.

Skoda’s can be very tricky cars depending on how well or how badly they have been maintained and serviced, and the above information will indicate whether it is worth your while to pursue repairs and if any associated costs are likely to come up along with repairs to your A/c.

Option 2: Visit recommended HVAC shops (some on this thread too) and post their suggested solutions here. A call can be taken whether to go ahead based on what they suggest and the reasons given.

[zaiddroid]

Originally Posted by svsantosh

Try united motors Rajajinagar (Bosch Authorised) near Magadi road toll gate. They are the 2nd best to any A.S.S because they have access to all brands manuals and laptop and scanners.

Skoda AC issue is not as simple as a condensor leak or compressor going weak. Get a laptop + knowledgeable AC mechanic to check the car.

You spoke of changing the Pressure switch that sticks into the compressor, but did you also change the Expansion valve (mostly seen in the firewall between the cabin and engine area?) Please advice. If that is also done then it is the electronics fooling the compressor to cut off.

The compressor diagnostic is pretty simple, the mechanic needs to hardwire/short a test lamp from compressor power to the inside of the car, when the AC clutch is engaged the light will be on, if compressor/clutch is getting cut off at the 30 min mark, then you can pin point the issue. Was this tried?

Hey the expansion valve wasn’t changed ever.





Yes a light bulb was connected to the power switch of the compressor and when the cooling cut off the light bulb too went off. I went to the authorized service center for a scan today snd here is what came. Please advice. Thanks

[zaiddroid]

Originally Posted by Jeroen

The first thing you need to do when encountering these sort of problems with an AC system is to check the charge and pressures in the system. If you are low on charge or if the in outlet pressures are way off, that needs to be investigated.

Off hand your symptoms suggest a problem with the expansion valve. When it goes bad the evaporator starts to freeze over. Stopping the engine/ AC for a little wheel lets it defrost and the cycle starts again.

Did you restart immediately and was the problem gone, or did you wait a little while.

I assume that the thermostat AMG Power is referring to, is in fact the expansion valve. It’s sometimes called thermostat but it doesn’t control any temperature as such.

Such a fault is unlikely to generate any error codes.

You need a real AC technician with the correct tools/manifold and monometers and knowledge about what pressure readings you should be looking at.

Sorry to say but it appears that everything was done so far, was done without any proper diagnostic approach. Just swap out parts and see what happens. Expensive, time consuming and usually highly irritating way of dealing with these issues.

Good luck
Jeroen

Yes you are right everything done till now was without diagnoses and just based on assumptions. I went to a technician today for the before and after pic of pressure manifold and also to authorised service center.

[NPV]

In case you are open to having an expert AC technician diagnose this (I don’t think he will have VCDS or any other manufacturer specific diagnostic tools), please try taking your car to Wecool near Garuda mall. You can find more details on the forum itself.

Location - Wecool

[zaiddroid]

Originally Posted by NPV

In case you are open to having an expert AC technician diagnose this (I don’t think he will have VCDS or any other manufacturer specific diagnostic tools), please try taking your car to Wecool near Garuda mall. You can find more details on the forum itself.

Location - Wecool

I had been there and met Mr Tobaiz. He said if it is something to do with electrical I can’t guarantee my work. If you want I’ll change the compressor but that will be all.

[zaiddroid]

Okay so now there is another update. I have changed the expansion valve, condenser, and compressor since this system was contaminated. But unfortunately, the ac still shuts cooling after 45 minutes. This is super annoying, no electrical fault reported in scan, ac system completely flushed and replaced. Ugh!

[The Mechanic]

Originally Posted by zaiddroid

Okay so now there is another update. I have changed the expansion valve, condenser, and compressor since this system was contaminated. But unfortunately, the ac still shuts cooling after 45 minutes. This is super annoying, no electrical fault reported in scan, ac system completely flushed and replaced. Ugh!

Have you checked your condenser fan?. Sorry If I missed it somewhere in the thread.


If you have not checked, check if it is turning ON correctly and is having the required speed. Some cars have a single fan for radiator and condenser and operate at 2 speeds, while some cars have a separate fan for the condenser.


Also, when the compressor is being cut off, is any refrigerant line frozen on the outside?

[mpksuhas]

To add what 'The Mechanic' posted above, do check if you are noticing abnormal condensation water when you park the car after AC stops cooling.

I was facing an issue similar to yours in my XUV couple of years back, however in my case AC was stopping cooling after few hours of usage. One thing I noticed was, when I stop the car after this and switch off the AC, I can notice more than usual water coming from the condensation drain out.

Later it was found out that there was a small leak in a gasket, causing very slow leak of refrigerant, but more than that, when driven for longer period, there used to be ice formation around this leak, causing disruption in proper air flow.

When I stop the car after this, this ice starts to melt due to heat of engine and suddenly makes a pool of water below the car.

[hensil]

Can you believe, I have the same issues with my Harrier 2022 April model. Last month the ac blower got faulty. I got it replaced under warranty. After that I learnt of the same issue as yours. Last week I went to the service center and explained them the issue. They did some general service and claimed the ac is working fine. Yesterday I came to know that the issue still persist.

I knew this was complicated to diagnose. And how would I prove about this issues to the service centre.
Tomorrow I'll go to the service center and show them this thread.

[Bsilver]

Originally Posted by zaiddroid

Okay so now there is another update. I have changed the expansion valve, condenser, and compressor since this system was contaminated. But unfortunately, the ac still shuts cooling after 45 minutes. This is super annoying, no electrical fault reported in scan, ac system completely flushed and replaced. Ugh!

I own the Fabia 2008 1.4 TDI and have the exact same problem with the vehicle, after some extended driving the AC stops cooling. From all the tests I did personally, I have come to some conclusions. The AC itself does not stop working or there is nothing wrong with the HVAC system at all. It is the fan which stops working. You can verify the same, drive normally, and when the AC stops working, then without shutting the engine, go and check the radiator fan. It will 100 % be stopped (at least in my case).

Since there is lack of air flow from the fan, the AC condenser is not able to exchange heat at low speed, and hence the no cooling in the AC system. I even did a test where I blew cold air from an external device, and the cooling gets restored in the system.

After this I have zeroed down that it is either a bad fan control module, or a bad relay. Since relays close and open, sometimes what happens is when the temperature increases the relay's electromagnetic field decreases causing it to shut temporarily and hence explains why the fan will turn off after extended duration of driving.
If we restart the vehicle, then the relay may reset its functionality and hence also explaining as to why the AC starts working after restarting. I have not yet changed the relay or tested the control module on my bench as I do not have the time, and I barely drive the vehicle. But this may help you to draw some conclusions for your problem. Hope this helps.

Happy Motoring!

[zaiddroid]

Thank you so much @Bsilver - I am going to keep an eye on the fan near the radiator. What do you mean by the control module? The body control module? Or the ECU? Please clarify. Thanks
Ps - where exactly is the relay for the fan?

[Bsilver]

Originally Posted by zaiddroid

Thank you so much @Bsilver - I am going to keep an eye on the fan near the radiator. What do you mean by the control module? The body control module? Or the ECU? Please clarify. Thanks
Ps - where exactly is the relay for the fan?

There is separate fan control module/relay which is present in the left lower side/passenger side near the radiator mounting points. This is responsible for controlling the fan. The part number: 1J0 919 506 M. If this is faulty then the above problem arises. This module turns faulty if a lot of water wading at high speeds is done, or there is some water entering into the bay area, at least for me the problem raised after passing through deep waters. There is a way to check this, bypass this fan control module by directly connecting the power/ground and necessary wiring directly to the fan, this will require you to splice wires and know the wiring diagrams, or if you are not able to do this, then better to get it done from a FNG. If the problem then goes away then it was the module which is faulty. Do remember that you cannot drive on this method for days together, as it will run the fan continuously which may cause it to overheat. Or an easier way is to replace this module with a known good one and check. If this also cannot be done, there is a even more complex way to do the same, if really required.

Happy Motoring!