Hi wondering if anyone can solve this mystery. My vrs (2019) has been throwing up an overheating warning and temp shoots straight from 90 to 130 deg c, but it’s not overheating and it only happens every few weeks or so. If you stop leave it 5 min and restart the engine it’s fine. No problem for another few weeks or so even through the recent hot weather. Now added to this issue it’s been slowly losing coolant but this has only happened recently and I topped up couldn’t see where the leak was coming from. Today had temperature warning again 3 or 4 times in a row no coolant loss no actual signs of overheating. It seemed fine carried on with my journey. Within 10 minutes the coolant loss warning light came on I pulled over checked the coolant level and it had all gone seemingly from just under the coolant reservoir. The reservoir was empty I filled it drove home about a 15 min journey no overheating warning no coolant loss. 
I suspect a faulty temperature sensor is the issue but how do you explain a sudden severe loss in coolant one minute then it retains the coolant the next. Going into Skoda today to get it sorted. Fingers crossed warranty will pay thanks for reading 

I would be reading with VCDS or so what the actual temperatures are; it's possible you have an issue somewhere in the system, along with air, which could cause issues. From your description I would expect a minor leak somewhere that's got a lot worse. Possible a failed connector, something like that.

Do a search.   briskoda dsg second thermostat   . 

Just so you can be aware of this possible issue.

Edited 1 July, 20241 yr by Ootohere

8 minutes ago, Ootohere said:

Do a search.   briskoda dsg second thermostat   . 

Just so you can be aware of this possible issue.

 

DSG second thermostat failiure caused temperatures not reaching the oprational ones, not overheating.

Fan is working?

Yes the fan is working fine comes in and goes off as necessary. I’ve had the recommended DSG and Haldex services too. It’s now with Skoda in Newport and as said hopefully the warranty I have which is with Skoda and covers everything!? Will cough up for whatever needs replacing fingers crossed. 

Edited 1 July, 20241 yr by PChadders

So Skoda Newport said there were no! Fault codes, no loss of pressure when tested, and initially no sign of coolant leaks?? This is despite losing all coolant from the reservoir. However they then said the coolant must have come out of the top of the reservoir is this possible? When I checked following the warning it had been lost I’m sure the top was dry!? 
they then diagnosed a faulty seal in the water pump and apparently there’s a known failure of this part in a dealer bulletin. Recommendation is to replace the pump. Unfortunately my extended warranty won’t cover it because I’ve done more than the 15k miles stipulated in the cover policy (ffs) this is probably the most annoying thing about the whole thing £900 lighter now. 
Hopefully this will remedy the issue but I’m still convinced there’s an electrical issue with the engine thinking it’s overheating when it’s not??

If it comes and goes, I would say some sensor is faulty or has bad connection at least.

What sensor, hell knows, there are tons of these in the modern cars.

 

Maybe get some OBD11, so you can monitor the faults on the go.

Well if it comes back I’ll certainly be contacting Skoda uk as well as the garage! 

Skoda’s (and VAG’s in general) water pumps are well documented for their weaknesses, and more bizarrely have been for many, many years.

 

Whilst the set-up on your vRS may be different, the water pump failure rate on the 2.0 TDI Kodiaq, as well as the 1.4 TSI, is mentioned a lot on this group and the various social media pages dedicated to the Kodiaq.
 

There are a few different faults, but one of the more common ones is the ‘sticking’ of a sleeve inside the pump, which sees the on-dash temperature gauge to read very high, without the engine actually overheating. Presumably the sleeve frees itself before this happens.

 

So common is the issue with the regular diesel Kodiaq there won’t be a Skoda dealer in the land that isn’t aware of it. Fingers crossed the fix they’ve applied to your pump fixes the issue.

10 hours ago, silver1011 said:

Skoda’s (and VAG’s in general) water pumps are well documented for their weaknesses, and more bizarrely have been for many, many years.

 

Whilst the set-up on your vRS may be different, the water pump failure rate on the 2.0 TDI Kodiaq, as well as the 1.4 TSI, is mentioned a lot on this group and the various social media pages dedicated to the Kodiaq.
 

There are a few different faults, but one of the more common ones is the ‘sticking’ of a sleeve inside the pump, which sees the on-dash temperature gauge to read very high, without the engine actually overheating. Presumably the sleeve frees itself before this happens.

 

So common is the issue with the regular diesel Kodiaq there won’t be a Skoda dealer in the land that isn’t aware of it. Fingers crossed the fix they’ve applied to your pump fixes the issue.

That’s pretty much what happens it’s a sleeve/ seal failure and the workshop bulletin is to replace the pump. When it does stick/fail the flow of coolant gets interrupted and the relevant sensor thinks the engine is overheating. 

Rather than start a new thread, I'll just add we are having the exact same issue.  I video'd the temperature going up, then coming down with the heater, and then it sits at normal values.  RRG Bolton won't fix it as they themselves can't see the issue, despite me giving them the video evidence.  Surely the fact that there is a known issue with the impeller sleeve, the fact I have video evidence, should be enough for them to fix it?  It's out of warranty next month I feel they are just trying to pass the buck.  What are the next options here?

46 minutes ago, crispymorgan said:

Rather than start a new thread, I'll just add we are having the exact same issue.  I video'd the temperature going up, then coming down with the heater, and then it sits at normal values.  RRG Bolton won't fix it as they themselves can't see the issue, despite me giving them the video evidence.  Surely the fact that there is a known issue with the impeller sleeve, the fact I have video evidence, should be enough for them to fix it?  It's out of warranty next month I feel they are just trying to pass the buck.  What are the next options here?

In your case, at the very least insist that your fault complaint is recorded as having occurred before expiration of warranty.

Given the known nature of this fault, personally, I'd be insisting of more extensive test by the dealer.   

 

47 minutes ago, crispymorgan said:

Rather than start a new thread, I'll just add we are having the exact same issue.  I video'd the temperature going up, then coming down with the heater, and then it sits at normal values.  RRG Bolton won't fix it as they themselves can't see the issue, despite me giving them the video evidence.  Surely the fact that there is a known issue with the impeller sleeve, the fact I have video evidence, should be enough for them to fix it?  It's out of warranty next month I feel they are just trying to pass the buck.  What are the next options here?

 

Agree, get it recorded at least.

 

Although maligned by many, I have had good assistance from Skoda customer services, both when buying the car and the aftermath, and more recently with getting the ignition switch replaced. I'd email [email protected] with your issue and see what they can do. At the very least it's another data point for having reported the issue within warranty.

as an aside to the topic: i had my water pump and cambelt replaced the other week. I picked the car up Friday morning, up the motorway towards home... BIM! Coolant level low....ah. Well, I guess I'll limp it to the next big town, where we used to live. Picked up 1l G12++, 1l distilled water. Let the pressure out, filled some, up to the max line.

Drive home another 300km. Check it, while things are still warm (I'd left it for several hours but I could feel the engine was milldly warm). I see it's below min again, but I have no warning.

 

I add another 250ml or so of both, and leave it alone. This morning, 8 days and 1200km later, I check it again -> i am back at Min. But no lights, warnings, nothing... so I top up to the max line and the 60km from today seems to see no change (and the car really is cold now) but with ambients at around 20C.

 

What I'm trying to say: the car won't warn on coolant low until there's very little in the system. I've added nearly 2l in (the bottles are nearly empty) and there's only been a coolant low warning once. The temperature on the gauges has been rock steady, despite +26C, hills, and a 1400kg caravan behind and a full car.

 

I would consider trying to datalog the temps as you run. Torque may be able to help with this. I would consider load, ambient, throttle position, speed and then coolant temp and if you can get it, flow. I haven't got everything here or I might be able to check out what's possible.