65 reg (Euro 6, AdBlue) SKODA YETI 2.0 DIESEL 42k miles

 

I drove probably 2 miles at motorway speed (75-ish I reckon) in 3rd gear (5 speed gearbox). I didn't realise I hadn't changed up but it didn't hit the rev limiter. However, the temp gauge did touch the red (130 degrees C) and a high temp warning beep sounded. I pulled over at first opportunity turned off and let car cool down. The water hadn't boiled out - levels okay - no burning smells, the back of the engine, manifold area, was definitely well hot. I wouldn't normally have expected to see this car overheat - it never has before (though I don't make a habit of driving high speed in 3rd).

 

Since, I've had an oil/filter change. But water and oil temps are both going above normal after say 10 mins driving. They're not going sky-high though (actually I haven't wanted to take it far to find out)

 

Heater works fine when I put it on.

 

Top and bottom rad hoses seems to be hot (top one very hot).

 

I don't think it's sensors as both water and oil are getting hot.

 

Could it be thermostat? 

 

Could it be water pump?

 

No funny noises, no leaks. Water rad fan seems to come on okay when it gets hot.

 

Anyone advise please? Cheers.

34 minutes ago, olley said:

Anyone advise please? Cheers.

 

Change gear earlier  Bet the DPF had one hell of a passive regen. Also, is a 2.0 Yeti only a 5 speed?

 

Thermostat is cheapest to replace but I think Euro 6 TDIs have that stupid waterpump with the thermostatic sleeve which might be getting stuck, don't quote me on it though. The cooling systems are very complicated on modern cars.

 

Have you got your engine code to determine what engine you have?

 

 

Hi

 

The amount of heat a modern efficient engine produces varies over a surprisingly wide range, depending on how hard it's working.  At idle its not very much, at motorway speeds or hill climbing many kilowatts. The thermostat takes care of this by regulating the flow to the radiator, if it's working properly.  So the immediate suspects are a thermostat jammed shut or nearly shut, and/or a failed water pump.  I once had a water pump fail on an Audi.  It had a plastic impeller (accountants idea to save 10p maybe ?) which split allowing it to lose its grip on the shaft.

 

You should be OK driving gently for short distances, keeping the heater on maximum with the blower going and keeping an eye on the water temperature.

 

6 hours ago, SuperbTWM said:

 

Change gear earlier  Bet the DPF had one hell of a passive regen. Also, is a 2.0 Yeti only a 5 speed?

 

Thermostat is cheapest to replace but I think Euro 6 TDIs have that stupid waterpump with the thermostatic sleeve which might be getting stuck, don't quote me on it though. The cooling systems are very complicated on modern cars.

 

Have you got your engine code to determine what engine you have?

 

 

 

Thanks!

 

Yes, it is only 5 spd manual box (2wd).

The engine code is 81KW M5F

 

Does that suggest it may have the stupid waterpump with thermo sleeve?

 

Cheers

 

 

SUCCESS – UPDATE:

 

Just had new water pump (and cambelt kit and aux belt) fitted. Overheating solved! Delighted!  Many thanks especially to SuperbTWM who put me on the right track in diagnosing the water pump issue.

 

Worth saying, Skoda Aylesford matched the price from another Skoda dealer and was actually less expensive than quotes from two independents (I'd normally go to independents, but I particularly wanted genuine Skoda parts which pushed up independent's quotes a lot - don't like wasting their time but I hadn't expected such a difference, also of course using Skoda prob looks better in my car's service history file).