Hi, help needed please. Does anyone know what this part is called? I've not had any warning lights come on, but the temperature gauge is going up to 130 from the usual 90 when I'm going at 70 on the motorway. It appears to be this part that's overheating, so doesn't look like a sensor issue. I've got it booked in to a garage this week, but it would be good to go armed with some knowledge. I'm also hoping the part needed assuming it's this is under a tenner 🙃. Thank you to anyone who can advise.

2.0 TDI by any chance?

21 minutes ago, MarkyG82 said:

2.0 TDI by any chance?

Yeah that's the one lol, any idea?

Do a search for diesel overheating. Loads of info on it. 

The end result will usually be a new water pump and most people do the cambelt too.

1 minute ago, MarkyG82 said:

Do a search for diesel overheating. Loads of info on it. 

The end result will usually be a new water pump and most people do the cambelt too.

Cheers, could be worse then. Do you know what part that is where the red dot is?

1 hour ago, prestwichian said:

Cheers, could be worse then. Do you know what part that is where the red dot is?

Why do you think that because you found something hot in your engine, that this is the cause of overheating? Exhaust bits get extremely hot. This is normal.

1 hour ago, prestwichian said:

Do you know what part that is where the red dot is?

 

The only part on the vehicle that gets hot and is under a tenner 😃

 

You are barking up the wrong tree, you do not diagnose an overheating engine by looking for the hottest part which will always be the exhaust or DPF. Your problem is a common one, the sliding sleeve on the water pump, it will go away of you disconnect the connector from the actuator but you will have to drive a lot further before getting heat from the heater.

 

At 3°c today from a cold start I had good heat from the heater vents within one mile, on my previous TDis it could take 8 miles.

 

If you are not able to remove the connector or want to retain the fast warm up function (its great while it works) then you will need a new water pump.

I agree with @J.R..

If I well understand the 1st pic, it's were fuel is injected to run DPF regeneration. Thus not surprising it gets hot.

The 130°C you're referring to concern the coolant system. Just point the hose at one end of the radiator with your red dot. The coolest end should be where the coolant temperature sensor is.

 

I unfortunately had to change my water pump because it had stuck in the wrong position.

Actually the pump remains inactive upon cold starts to accelerate oil temperature increase, to make the engine be at its best operating point quicker. But if the water pump doesn't activate, it can lead to overtemp...

A safe way to protect your engine from overtemp until your water pump is changed is to set cabin heating at max position, if your coolant starts getting higher than 95-100°C  

 

As @J.R.mentioned I did take the opportunity to have the cam belt replaced when they changed the water pump.

 

BTW : Skoda France granted me a 90% support on the water pump replacement costs, since this is a known issue on TDI engines. But cam belt spare parts were 100% charged to me (labor hours were already included in water pump replacement).
Note: Skoda recommends a cam belt replacement at 210000 km on TDI engines, whereas there's no replacement recommendation for water pump. It's only a common habit to have it changed upon cam belt replacement. Thus, depending on the mileage of your engine, the Skoda UK will define the support percentage, they should grant you. 
It happened at 62000 km for me.

 

 

22 minutes ago, Bap33 said:

Actually the pump remains inactive upon cold starts to accelerate oil temperature increase, to make the engine be at its best operating point quicker. But if the water pump doesn't activate, it can lead to overtemp...

 

Water pump is belt driven so always "active" in that the impellor turns, during cold start a sleeve is deployed which shrouds the impellor stopping the circulation, its the pressure developed from the pump which powers the sleeve against a return spring, the actuator is a valve allowing the water to pressurise a bellows moving the sleeve.

 

Its default power off position is undeployed and is maintained there by spring pressure so unless you are unlucky to have the sleeve stuck permanently whilst deployed which would have left the car undriveable then it will be safe to disconnect the connector when the engine is cold, it is not a case that the water pump will not be activated but that the sliding sleeve will not be deployed, the engine will warm up slower and the heater output non existant during that time

 

You were unfortunate to have the sleeve stuck open, if that were the case the car would have overheated and boiled over within a few miles of driving, was that what happened to yours?

Well, I don't know what happened in detail. I just had the warning on the dashboard twice and found the issue on this brilliant forum! I just then understood about what the system aims at.

Problem was confirmed by the dealer.