Ok got a octavia scout 2.0 cr from new, alls ok till about six weeks ago when i noticed rather than the usual no heat from the heater on the way to work(only 2.5 miles), i had heat(it was 0 degrees outside) and the temp gauge was at 60 degrees. Since then i've kept an eye on the temp and its now to the point where after 1 1/2 miles the gauge is saying 70 dgrees and there is heat comimg through. Ive done a couple of motorway drives to count out a DPF regen and see if the engine overheats, all to no avail, engine gets to 90 degrees and stays there. It was due a service so had that done at Rainworth Skoda and as it was under warranty had them look at it and as expected the computer said no, no faults found, they just basicaly say computer says no faults they haven't heard of it before so nothing wrong. Its never done this before in 26 months from new and being an engineer know a car getting this hot so quick can't be right, it doe'snt feel any different power wise but driving to France in a few weeks time usaully doing about 650 miles a day i don't fancy a boiling car in the middle of rural france. Any ideas people?

Thanks in advance.

Seems like a tough one tbh

Have you checked your radiator? i only say this because on my preivious car (focus diesel) i had a similar thing happen to me last year.

Basically on the focus..( im assuming octavia is the same) the temp sensor on your dash is coolant temp not oil temp and mine started to warm up much quicker than normal and the heater....worked faster lol.

Lifted the bonnet to take a peek with an infared thermometre i had at work and found that the block itself wasnt actauuly that warm, but the coolant was.

To cut a long story short i took of a small plastic cover under the intercooler (on the focus...not my octavia remember) and found a bloody plastic bag was stuck to the front of my radiator, i was getting the same effect as the guys in much colder places using grill covers lol

Edited 4 March, 201313 yr by Craigt191

Great idea, so have just dashed out hopefully to check, unfortunatly apart from one leaf its dead clear, must say Rainworth said they have tested both temp sender and gauge and both seem tobe working correctly. The gauge on the dash is for water temp by the way

Does your car have an auxiliary heater? Most UK spec Octys didn't as Britain wasn't deemed cold enough to justify it, but ISTR Skoda began fitting auxiliary heaters even to some UK spec CR diesels a couple of years ago. They are usually set to only come into operation when the heater controls are at (or near) max heat and the engine is cold.

No it does'nt, the heaters usualy set for 19-21 degrees. And the aircon is always off unless its pretty hot to, as it used to increase my MPG on other cars i've had, but sure if it matters on this one.

Is there pressure in the coolant system.i remember something like this once, the impeller had fallen of the water pump.

If its not over heating then where's the problem.

I've noticed a marked improvement in how quickly the car is getting up to temperature over the last few days. It's been quite a bit milder up here recently.

Thanks for the ideas,the temps now getting to 60 degrees in less than a mile so have talked to Rainworth about it being the impeller and as expected they bucked at the idea of having to spend time on a customers car without having a major failure as proof somethings wrong, but have agreed to take the car for a few days and change the thermastat to "see what happens", will update as soon as theres any news, as they can't look at it for two weeks i'll at least have a very warm car to work for a while or a fryed engine.

Looked at mine today as it had hit 70C (water) and I'd only done a couple of miles. Not sure it's a problem TBH.

That said, I'd been on a. Dual carriageway......

Hi, my initial thought was thermostat, but if they fail there is a bypass to save you cooking your block! Ie your block and radiator would be as one, therefore cooler longer!

Would it be possible at the 70 deg point to stop and try to tell if the rad is warm?

Is 70 about norm temp? Or is it a lot higher than normal. I'd check your pressure cap as well, as this may allow the water to get hot quickly, ie 70+ when if pressurised would be at say 35 deg

not being funny but you dont have a problem. the gauges are not that accurate.....

I've noticed a marked improvement in how quickly the car is getting up to temperature over the last few days. It's been quite a bit milder up here recently.

+1 - What he said

Thanks for the comments, the reason im concerned about this matter is that i have run this car now for around 28 months from new and know that in summer it usualy takes around five to seven miles to hit full temp (indicated 90 degrees) and in winter if the outside temps under around 5, then unless i get on the motorway then the temp never seems to hit anywhere near 90, so to start getting to around 70 in such a short distance when the outside temp is so low to me that says something is wrong/changed. Im sure you're all the same you know just how you're own car feels and pretty quickly notice when something is'nt right with it, or is that just me haha.

Thanks for the ideas,the temps now getting to 60 degrees in less than a mile so have talked to Rainworth about it being the impeller and as expected they bucked at the idea of having to spend time on a customers car without having a major failure as proof somethings wrong, but have agreed to take the car for a few days and change the thermastat to "see what happens", will update as soon as theres any news, as they can't look at it for two weeks i'll at least have a very warm car to work for a while or a fryed engine.

I suspect you do have a problem,it might just be a faulty sensor,my 2008 vrs petrol doesnt warm up as quick as your saying your diesel does.

I once monitor my temp on MFD and within the 6mile commute it quickly goes to 90degrees.

Normally i would panic (knowing not a lot abt cars mechanics)..

...thn realised the needle guage was only 1/2 way up - so assume normal?

My PD 140 was showing 110 yesterday, also 27 mpg for the trip,

I thought about this on the way home today. Bear in mind that I come out the office and within 300 yards have left a 30 zone and am on a 60mph country lane. After a mile I'm on a dual carriageway (although dont obviously run it that hard at this stage as the oil will still be quite cold).

At 1.5 miles the water temp gauge was just starting to move. It hit 70C at between 2 and 2.1 miles and was at 90 a fraction after 3 miles.

Edited 6 March, 201313 yr by mr_awol

Im sure you're all the same you know just how you're own car feels and pretty quickly notice when something is'nt right with it, or is that just me haha.

Stick with it mate, I know what you mean. I know all my Octavia's little quirks. I even know when it wants to regen the DPF now.

The obvious cause has got to be a dicky thermostat. Don't let the dealer brush you off.

If I was heading abroad I'd want to know the issue was fixed too.