Hi all New on here just purchased a 1.8 tdci 2010 day after I bought I was giving a good drive round as you do with a new car and when I parked up I hear bubbling and the expansion tank lid pops and chucks some water out.

Been mechanic he says building up pressure in the cooling system and reckons could be egr cooler he didn't think it would be headgasket as car runs fine otherwise and has steel head/gasket but couldn't look properly as was going on holiday 

After looking into this could be easier to black it off which could possibly do myself but wanted to ask has anybody had any issues doing this without car being mapped after and also how would I connect the water pipes together 

Mechanic has said this is what he'll be doing to check the egr but being impatient can't wait till after his holiday and save a few quid doing myself 

Any advice much appreciated 

I would change the Pressure Cap and keep a daily eye on the Coolant level before doing anything else.

Can join water pipes together with a simple copper plumbing joint and jubilee clips.  Just make sure the ends of the joint are beaded.

1.8 TDCI should be ok with an EGR blank.

You can use a CO2 sniff test to check whether the coolant pressure is being caused by exhaust gasses or not.

On 8/27/2023 at 12:41 PM, Tizer said:

I would change the Pressure Cap and keep a daily eye on the Coolant level before doing anything else.

Coolant levels have stayed the same 

On 8/27/2023 at 12:56 PM, TomsFocus said:

Can join water pipes together with a simple copper plumbing joint and jubilee clips.  Just make sure the ends of the joint are beaded.

1.8 TDCI should be ok with an EGR blank.

You can use a CO2 sniff test to check whether the coolant pressure is being caused by exhaust gasses or not.

just ordered a couple of blanking plates may as well blank off anyway after its been tested thank you 

On 8/27/2023 at 12:56 PM, TomsFocus said:

Can join water pipes together with a simple copper plumbing joint and jubilee clips.  Just make sure the ends of the joint are beaded.

1.8 TDCI should be ok with an EGR blank.

You can use a CO2 sniff test to check whether the coolant pressure is being caused by exhaust gasses or not.

Any idea what the width of the pipes are to get the right size copper pipe cheers 

11 hours ago, ianhairy said:

Any idea what the width of the pipes are to get the right size copper pipe cheers 

No.  You'd have to measure them on your car I'm afraid.

I also don't recommend permanently blanking a working EGR.  Only if it's found to be leaking.

On 8/27/2023 at 12:41 PM, Tizer said:

I would change the Pressure Cap and keep a daily eye on the Coolant level before doing anything else.

I bought a new cap it popped off after pressure built-up