Location of coolant temperature sensor

Slugger · Aug 24, 2008

Can anyone highlight on this diagram where the location of the coolant temp sensor/sender is?

The engine is a 1.9 tdi 110 from a 2002 seat leon.

Many thanks

googies · Aug 24, 2008

I'd hazard a guess at the black connection on the coolant tank, 16?

Slugger · Aug 24, 2008

From reading on another thread it mentioned it being on the right hand side near the MAF? But I couldn't see anything obvious when I had a quick look.

Going to go and explore more now.

Any more help appreciated!

oldman · Aug 24, 2008

that was my thought as well googies
normally should see the two prongs in it as well after opening the blue cap

googies · Aug 24, 2008

Yeah thats why i thought it was there, have nothiced the prongs before and concluded it being a sensor. Unless there is a sender in the head?

Slugger · Aug 25, 2008

There is also a sender to the right of the engine block as you look at the picture.

Managed to find it quite quickly in the end. Thanks for the input guys. Only problem now is that it didn't solve the issue with the car not wanting to start straight away as though the glow plugs haven't heated up fully.

sssstew · Aug 25, 2008

the one that googies refers to is the coolant level sensor.

jiege01 · Aug 25, 2008

Slugger said:
There is also a sender to the right of the engine block as you look at the picture.

Managed to find it quite quickly in the end. Thanks for the input guys. Only problem now is that it didn't solve the issue with the car not wanting to start straight away as though the glow plugs haven't heated up fully.

glow plug relay under the steering wheel?

googies · Aug 25, 2008

sssstew said:
the one that googies refers to is the coolant level sensor.

Thanks sssstew. Wasn't fully sure of exactly function.

Muttley · Aug 26, 2008

Right hand end of the block, attached to the coolant pipe Tee, and located underneath the rear pipe, not visible in the picture (good job I've left it on photobucket, eh?). On that picture, the circular vacuum pump is visible at the end of the cam cover: below that, attached to the block, is the metal Tee taking hot coolant from the engine and splitting it to the radiator and the cabin heater (with a bleed off underneath to the oil cooler). Is that where you found yours?

Slugger · Aug 26, 2008

Muttley said:
Right hand end of the block, attached to the coolant pipe Tee, and located underneath the rear pipe, not visible in the picture (good job I've left it on photobucket, eh?). On that picture, the circular vacuum pump is visible at the end of the cam cover: below that, attached to the block, is the metal Tee taking hot coolant from the engine and splitting it to the radiator and the cabin heater (with a bleed off underneath to the oil cooler). Is that where you found yours?

lol, yeah thank you for the use of the picture.

Thats where I eventually found the sensor. Was difficult to see because of the pipe that is right above it.

Your explanation of its location is very good though.

I think the problem may be the fuel pump however, so will get on a do some more searching.

Thanks

black04ctdi · Dec 1, 2008

Just changed mine today and it was fairly easy to find, but seeing as I couldn't find any pictures showing the location of this common problem, I took some to share with you!

See my Flickr set for comments....

Muttley · Dec 2, 2008

Nice set of pictures, thanks. You have three glow plugs in the coolant to provide fast warm-up on cold days, something I don't have - but then I only have a TDI 110. I was told they were only standard in cold countries?

black04ctdi · Dec 2, 2008

Haha, well I didn't even know that's what they were! I'm new to this diesel engine thing, I've been used to a rotary engine for the last 6 years! So are they the glowplugs for the engine? I'm in the UK, and its a 150 Cupra.

sssstew · Dec 3, 2008

no they are not THE glow plugs, they are in the front of the block, in a horizontal line you will see if you take the engine cover off.

black04ctdi · Dec 3, 2008

sssstew said:
no they are not THE glow plugs, they are in the front of the block, in a horizontal line you will see if you take the engine cover off.

Cheers, I didn't think so...normally know my stuff with engines, think I need to read up on diesels!

Muttley · Dec 3, 2008

Sorry to be the cause of confusion.

There will be a single glow plug in each cylinder, providing the pre-heat for cold starting which all diesel engines benefit from.

In addition you have three extra glowplugs (identical, as far as I know, to the ones in the cylinders) which warm the engine coolant up to get the engine to operating temperature more quickly. I don't know offhand whether they come on every time you start, or only when it's cold outside.

googies · Dec 3, 2008

As far as I recall the glowplugs for the starting combustion only come into action under a certain temperature, something like 5degrees C maybe? Correct me if I am wrong.

sssstew · Dec 4, 2008

Your right googies. Direct injection diesels dont need glow plugs really, but when its really cold they can help get a quicker/smoother start.

googies · Dec 4, 2008

Sometimes when really cold or sitting for a period of time it helps to hit the glow plugs twice before cranking the engine, I find it starts easier and smoother.

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Location of coolant temperature sensor

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