DPF has been doing it's winter regular regenerations of late, although not daily like last year as yet.

Noticed tonight for the first time this winter season, she was running particularly cold. Coolant fluctuating between eighty and ninety, with oil temps getting little above eighty during the 35 mile run home. Following images taken immediately after engine shut-down once home;

Yes 80 on the coolant and 73 on the oil after 35 miles running -3 to -4 degrees outside.

TP

Edited 16 January, 201313 yr by The Plumber

If the temperature gauge is anything like the one in my Audi, it has software which makes it read a reassuring exact 90 for any engine temp between about 85 and 95. I guess this "dead zone" is to mask normal fluctuations and maybe stop people from rushing back to the dealer unnecessarily. If its still reading below 90 after 10 miles I would suspect a genuine fault.

Not quite as cold here, -2 today, 15 mile journey, water temp up to 90 within 10 miles and oil temp hit 90 by about the 15 mile mark.

Yours Yet does seam to be running cold.

Hi Tim

I know we have the lower grill cover on, but after that distance mine would have been up to 90 no problem even at -4. It would only get to 80 on swmbo's 5 mile run to work at -4 without the cover, but with the cover fitted it gets near normal temp on the 5 mile run so it is a help.

With all the checks that have been done with regard to the regens, have they looked at the thermostat, it seems to be running a very low temp after 35 miles.

Especially with all your hills

My Yeti took about 30 miles to hit 90'C when I drove home from Stansted last year when it was cold, I have also noticed when driving around town or short journeys the temp gauge does stay low, if it does get to 90'C and then I stop at lights for a few minutes or stop in a traffic jam the temp drops quickly.

I suppose there is a big radiator up front with cold air hitting it and if you have the heater on more cold air is being pulled through the heater matrix providing more heat exchange.

Will be interesting to see what others have noticed and if this is unique to a certain engine?

Wow, big difference between these diesel fuelled monsters and my petrol. -2 this morning and it hit 90 degrees oil temp at just 4 miles. My water temperature is up at 90 in around half that distance. The way the cabin heats up is great in this weather, a big contrast compared to our other car (a diesel!)

Noticed the coolant gauge would get to ninety, then steadily drop back to 80 and stay there for a short while before climbing back to ninety, to repeat then process. Only does this very very occasionally in cold weather, however low oil temps in winter are common.

Had a Felicia years ago that did the same thing with the coolant reading, also in cold weather; about the only two cars from recollection to do this.

TP

Noticed the coolant gauge would get to ninety, then steadily drop back to 80 and stay there for a short while before climbing back to ninety, to repeat then process. Only does this very very occasionally in cold weather, however low oil temps in winter are common.

Had a Felicia years ago that did the same thing with the coolant reading, also in cold weather; about the only two cars from recollection to do this.

TP

So your previous Yeti didn't exhibit this pattern?!

It's the price for a decent thermal efficiency. If I end up going to Germany again this winter, I'll seriously think about a piece of cardboard over the lower part of the rad. Too cool is not cool.

What is the normal indicated oil temp on a Yeti? I vaguely remember a figure in the 90C region being a good ballpark figure.

It's the price for a decent thermal efficiency. If I end up going to Germany again this winter, I'll seriously think about a piece of cardboard over the lower part of the rad. Too cool is not cool.

What is the normal indicated oil temp on a Yeti? I vaguely remember a figure in the 90C region being a good ballpark figure.

Mine usually sits at 100c after around 6 miles in the summer. I've seen 125c max and that was in exceptionally extreme driving circumstances.

Yes I like to see 90 before I really push on.

tp I've got a 20 mile drive to work and my car doesn't reach 90 deg in that time if it's cold. this is my second 110 diesel. the first one was the same in cold weather.

I'm really not concerned as icy cold air blowing through is obviously going to stop the diesel lump heating as quickly! !

however I'm still getting warm air in cabin after two miles at minus temps

So your previous Yeti didn't exhibit this pattern?!

Not that I remember with the coolant and the DPF, although slightly more active in winter, was nothing like anywhere near the frequency of the current beast. Oil I couldn't say, as she missed out on the oil indicator by three weeks; built WK42/09, oil temp indicator introduced WK45/09.

TP

It's the price for a decent thermal efficiency. If I end up going to Germany again this winter, I'll seriously think about a piece of cardboard over the lower part of the rad. Too cool is not cool.

What is the normal indicated oil temp on a Yeti? I vaguely remember a figure in the 90C region being a good ballpark figure.

Summer mid 90's for me as a rule, with long hill climbs, such as we experienced in Austria, pushing her to 115+. Winter as can be seen, as low as 73 :S

Dread to think what reading I would be getting in say North Norway right now; probably freeze solid

When I started out all cars apart from mini's had north/south engines. Now there are far more east/west. The area of the block facing forward and exposed to the still icy blast is far more in the latter case. A contributory factor methinks. As the colooing system is designed to cope with Sahara type conditions as well, it's not hard to imagine it being somewhat over cooled in the current minus temps. The Octavia is certainly too cool in winter in Germany, -10C ish.

If you lived in North Norway, you would have a proper block heater, and not switch your car off outside. On a winter camping trip (not North Norway!) I had to put the trangia under the sump on the guzzi.

The Yeti got up to temp eventually today at 18 miles - about as long a time as I've seen it. People were taking things cautiously, so with low speeds it was a very slow climb past 70C. Even when it reached 90 it kept dropping back a bit as soon as traffic slowed.

To my knowledge there is a mechanical pressure valve that will let the coolant circulate only after the engine has reached a good working temperature( bet. 90 and 100 Deg. Celcius)

The valve closes when the coolant temp is too low,and opens when it gets too high

In my opinion,the coolant guage should show 90,regardless of the outside temp,high or low.

I suggest you have your yeti cooling system checked promptly,the pressure valve may stuck in the open position.

Edited 17 January, 201313 yr by oriki

You mean the thermostat? No, that's fine.

I guess you don't get much experience of driving in sub zero temperatures in Israel. 600kms with temps never higher than -5 and sometimes lower than -10, you have to make a choice between keeping the screen clear - priority - or being warm yourself.

The overcooling is compounded by poor heater duct layout in the Octavia's footwells. Burning shins and freezing feet.

On the "I may get around to it sometime" list, to combat the road and mechanical noise, thinking of adding some soundproofing and hoping it may just improve thermal insulation too. The foamy type stuff anyway.

Slightly (but not entirely) off-topic: noise insulation such as Silent coat really do wonders for the engine heating up in cold weather. I put some of this stuff under the hood of my 1.2 TSI Roomster, and the change compared to last winter was impressive. The Roomster already had the OEM mat insulation inside the hood, and I added this stuff under the mat.

Thanks for that. Gives me a bit extra motivation to actually do something about it.

Do you know if there are any other differences? Is there a cold weather spec for the big white north? Or just the same as here?

Sorry for the slight topic drift with this TP, but it is vaguely dealing with consequences of over cooling.

Edited 17 January, 201313 yr by nickguzzi

Noticed the coolant gauge would get to ninety, then steadily drop back to 80 and stay there for a short while before climbing back to ninety, to repeat then process. Only does this very very occasionally in cold weather, however low oil temps in winter are common.

Had a Felicia years ago that did the same thing with the coolant reading, also in cold weather; about the only two cars from recollection to do this.

TP

That sounds as if the thermostat is working correctly. But temps do seem a bit low for that journey distance.

Fred

Slightly (but not entirely) off-topic: noise insulation such as Silent coat really do wonders for the engine heating up in cold weather. I put some of this stuff under the hood of my 1.2 TSI Roomster, and the change compared to last winter was impressive. The Roomster already had the OEM mat insulation inside the hood, and I added this stuff under the mat.

I was considering adding an insulation mat under my petrol Yeti's hood too (just metal there currently), but wondered if it might run too hot in the warmer months. What's your experience?

..

Edited 17 January, 201313 yr by Expatman

My use of car this year has been very low. I have done about 100 miles in total! So it was not until yesterday that I could monitor my oil and rad temps.

It took about 5 miles for the oil temp to move off --- and over the course of 21 miles it rose to 92c. I did have 3 short stops though.

Water temp rose to 90 by about 6 miles and stayed constant. Dropping back slightly at the stops.

TP...I do wonder if your car has a lazy thermostat. I can't believe this has not been fully checked but it does seem not to be keeping the temp up. Many years ago I had an Allegro (yes I know!) and amongst its many problems the fluctuating temp was a lazy thermostat. It was one of the few problems I managed to get fixed.

Fitted the lower grill cover at the beginning of the winter and it has drastically reduced the time taken to reach normal operating temperature. Has had a big impact on fuel economy too. Have done the odd 50 mile sprint down the motorway with the grill cover fitted too without any obvious temperature increase, but intend to remove for the summer. Can recommend the Heko cover, good price, quality and two minutes to fit.