Yeti 2.0 litre tdi temperature problems

[Bopman]

My Yeti had a problem with cooling, namely not getting up to temperature and although replacing the thermostat did improve the problem, it didn't entirely cure it! I even replaced the temperature sender which is shown as being a 4 wire type but in fact is a 2 wire type. It did get to the 90 degrees eventually but could take a distance of between 18 - 30 km's. Anyway, getting down to brass tacks after lots of searching and head scratching I found a couple of people who had had similar problems which turned out to be the "second" thermostat in the  pipework to the DSG oil cooler, so I bit the bullet ordered one and fitted it and voila the car was finally back to its former glory! The original was like a piece of pipe with no restriction whatsoever when blowing through it. (The Bakelite from within had disintegrated on the seat to the thermostatic valve). Not good on a car that has only done 73,000 km's! The part number is 1K0121113A  and took around 40 minutes all up to replace including removal of the air filter box, taking care not to damage anything when releasing the hose clips. I did loose a tiny bit of coolant and topped up using distilled water. I apologise if this has been covered already, but I feel so relieved to have got down to the problem. My local V-Dub man had never encountered the problem...Cheers Rick in Oz 

[Ryeman]

It’s not made by Sachs is it?.

I agree, pretty poor life unless, like mine, it had been in storage before sale for 25 months.

Bakerlite; there’s a blast from the past.

[Bopman]

1 hour ago, Ryeman said:

It’s not made by Sachs is it?.

I agree, pretty poor life unless, like mine, it had been in storage before sale for 25 months.

Bakerlite; there’s a blast from the past.

 

Don't know who made it but the car was made in 2013 and registered in the same year. I see the same part is available from China on eBay but I chose to avoid like the plague, but who knows it might be better than the original!!

If a metal insert had been incorporated in the moulding process during manufacture, I have no doubt it would have lasted longer, but like everything these days, it's all down to price! This part is not exactly cheap, although I did get some discount but the fact that it was a stocked item signifies that it is a known failure on VAG vehicles and I'd certainly advise anyone with a low temperature or slow time to reach normal to check this part first before replacing the engine thermostat as a first course of action. VCDS showed low water and oil temperature and I think as we all know, running at low engine temperature is not good with regards fuel consumption or engine wear!

The DSG cooler thermostat is rated at 75 degrees from what I gather.

As for Bakelite - Yes, I'm showing age here.  

[Ryeman]

The effect on the EGR cooler valve and DPF lifespans would be my major concern.

GPFs coming soon too......nowhere to hide these days.

[Bopman]

17 minutes ago, Ryeman said:

The effect on the EGR cooler valve and DPF lifespans would be my major concern.

GPFs coming soon too......nowhere to hide these days.

 

Yes, my concern too!..The EGR valve was cleaned when I had the engine thermostat replaced and I do now run an additive every so often in my fuel along with regular oil changes and oil filter every 7,500 Km's.

I love the car but it has had its fair share of problems, air-con compressor, haldex pump and then this which started out of the blue after I had the engine cover off locating a leak from the DSG filter O ring that started to leak after a DSG service. Obviously just a coincidence, but at the time I thought I must have disturbed something.

We're thinking of trading in against a Subaru Outback AWD (non diesel) and I ignore the Skoda letters of a software upgrade for Dieselgate as I've read too many horror stories!!  

[Ryeman]

16 minutes ago, Bopman said:

 

Yes, my concern too!..The EGR valve was cleaned when I had the engine thermostat replaced and I do now run an additive every so often in my fuel along with regular oil changes and oil filter every 7,500 Km's.

I love the car but it has had its fair share of problems, air-con compressor, haldex pump and then this which started out of the blue after I had the engine cover off locating a leak from the DSG filter O ring that started to leak after a DSG service. Obviously just a coincidence, but at the time I thought I must have disturbed something.

We're thinking of trading in against a Subaru Outback AWD (non diesel) and I ignore the Skoda letters of a software upgrade for Dieselgate as I've read too many horror stories!!  

Beat the GPF intro would be my intention, little space under the bonnet as it is.

[Bopman]

2 hours ago, Ryeman said:

Beat the GPF intro would be my intention, little space under the bonnet as it is.

 

GPF intro?

[Ryeman]

12 minutes ago, Bopman said:

 

GPF intro?

Yes, Gasoline Particulate Filter (petrol version of the DPF), but not a ’feature’ you’ll be hearing about if the dealership/advertising industry have anything to do with it.

(The specs for the award winning Peugeot 1.2 now specify pre and post GPF engine emissions.....greater emissions of CO2/ higher fuel consumption, more back pressure,  but reduced particulate emissions......it’s just a matter of time it seems.)

[gumdrop]

I don't do much of a mileage nowadays so I use expensive premium diesel as it

has all the "keeping the internals clean" additives you can shake a stick at!

[Bopman]

1 hour ago, gumdrop said:

I don't do much of a mileage nowadays so I use expensive premium diesel as it

has all the "keeping the internals clean" additives you can shake a stick at!

 

Yes, I have to admit the Yeti seems to like BP Ultimate- Not sure if it's a viscosity thing but she (Miss Yeti) seems to run best on it over all other brands, although I have a refinery 18 Km's down the road and trucks of all brands seem to come out of the same gate.

I've had diesels 50% of the time, even before moving to Australia from the UK where I ran my faithful Ford Escort diesel, but these days with modern common rail injection systems, I'm not so sure that diesel cars are as forgiving in terms of fuel quality, especially with high pressure pumps and piezo injectors.

I'll probably go back to petrol on the next car.

[Urrell]

16 minutes ago, Bopman said:

I'm not so sure that diesel cars are as forgiving in terms of fuel quality, especially with high pressure pumps and piezo injectors.

I'll probably go back to petrol on the next car.

 

Pretty sure that petrol cars are going the same way for a cleaner more efficient burn but without the extra lubrication properties of diesel.

[oriki]

A big thank you,Bopman.I took the complicated,tedious and expensive option of changing the thermostat.Alas,the problem you had persisted.Seeing your post,I took your advice and ordered the part.Bingo.Problem solved!Let me tell you your solution was unknown to professional mechanics knowing this engine, who ,until your revelation,were baffled.

This is a priceless piece of advice you have posted here.Again,thanks a lot.

 

 

 

 

 

 

Edited 5 February, 2018 by oriki

[Bopman]

31 minutes ago, oriki said:

A big thank you,Bopman.I took the complicated,tedious and expensive option of changing the thermostat.Alas,the problem you had persisted.Seeing your post,I took your advice and ordered the part.Bingo.Problem solved!Let me tell you your solution was unknown to professional mechanics knowing this engine, who ,until your revelation,were baffled.

This is a priceless piece of advice you have posted here.Again,thanks a lot.

 

Hi Oriki - I'm pleased to have been of use, although I can't take all the credit since I stumbled on it whilst searching for a solution to the problem myself and found it on a Volkswagen forum, although it referred to a different engine..I think when I saw it being related to the DSG gearbox, the penny dropped and I went in search of the offending second thermostat. (Not easy to see) I think my VW mechanic thought I was suffering from some sort of coolant temp phobia but apart from proving him wrong, I was relieved to have found the solution!

As they say, "All's well that ends well"

 

 

 

 

[Ryeman]

On 18/01/2018 at 11:47, Bopman said:

My Yeti had a problem with cooling, namely not getting up to temperature and although replacing the thermostat did improve the problem, it didn't entirely cure it! I even replaced the temperature sender which is shown as being a 4 wire type but in fact is a 2 wire type. It did get to the 90 degrees eventually but could take a distance of between 18 - 30 km's. Anyway, getting down to brass tacks after lots of searching and head scratching I found a couple of people who had had similar problems which turned out to be the "second" thermostat in the  pipework to the DSG oil cooler, so I bit the bullet ordered one and fitted it and voila the car was finally back to its former glory! The original was like a piece of pipe with no restriction whatsoever when blowing through it. (The Bakelite from within had disintegrated on the seat to the thermostatic valve). Not good on a car that has only done 73,000 km's! The part number is 1K0121113A  and took around 40 minutes all up to replace including removal of the air filter box, taking care not to damage anything when releasing the hose clips. I did loose a tiny bit of coolant and topped up using distilled water. I apologise if this has been covered already, but I feel so relieved to have got down to the problem. My local V-Dub man had never encountered the problem...Cheers Rick in Oz 

I guess this is an example of a non sensor covered component failure.....in the depths of a northern winter at least.

One gets the sense (no jokes) that the modern mechanics are now so completely beholden to their laptop analyser they have lost their origin analysing skills particularly in the thermodynamics area.

 

(there are some very clueing diesel mod people on that Aussie forum). 

Edited 6 February, 2018 by Ryeman