C5 x7 v6 TTD Engine overheating

[hayden641946]

Is there a valve in the cooling system that can be faulty and shut off the coolant to flow all the way through the engine ????

[GiveMeABreak]

What are the faults / symptoms? There was a modification to the cooling outlet housing on Euro 5 vehicles, relating to incidents with the engine coolant temperature sensor.

See my illustrated post here:

viewtopic.php?p=640455#p640455

[xantia_v6]

What are the faults / symptoms? There was a modification to the cooling outlet housing on Euro 5 vehicles, relating to incidents with the engine coolant temperature sensor.

See my illustrated post here:

viewtopic.php?p=640455#p640455

That post is for the EP engines, I think not relavent here.

[GiveMeABreak]

I just rechecked and it does refer to the EP engines you are correct -so ignore that one.

[hayden641946]

My wife phoned me from 5 klms away and said a warning sign had come up on the instrument , STOP ENGINE OVERHEATING .
I said drive home slowly and I will look for problem .
I had to add 5 litres of coolant to the tank after engine cooled , which seems a lot as it holds about 10 litres full .
I couldn't see a leak and today after a shopping trip I checked again and the plastic tank was empty . I thought the worse that a head gasket may have gone and the coolant was blowing out the exhaust !!
Decided to do an engine oil change as it was due at 170000 klm . Upon removing the large plastic tray under the engine I noticed cooling fluid on tray and now ran onto the garage floor .

Has anyone had a leak from their C5 X7 V6 3.0 L around the rear ?? of the engine as I have not found the source yet ??

[GiveMeABreak]

Have a look at the diagram below Hayden. Let me know which suspected area 'A' to 'E' the leak is coming from, bearing in mind gravity - so the source of the leak. You may need to take a few pics, dry the area up, then watch for the leak again to get the source.

Click Image to Zoom

[hayden641946]

Thanks for the drawings Marc ,
I have found the leak and it is in a very hard to access position . I will try and attach photos and the rough sketch I did .
It appears to be leaking from a black plastic housing position under the front injection manifold and directly behind the yellow handle of dip stick .
The cooling fluid was dripping from the lower mounting screw head , there are two hoses connected , the smaller one leads forward to an aluminium pipe . I think this housing may be located into the cast iron block with a spigot !!!?? this may be where it is leaking . The housing is above the air con compressor ! I don't know what to remove to get at this black housing . It would be unlikely that the screw needs tightening , which would be extremely hard without removing something . Hope you have some ideas please !!

[hayden641946]

[GiveMeABreak]

Here? - This is the EGR exchanger coolant inlet and outlet pipes...

or on the Timing Face here:

... or none of the above

[hayden641946]

Thanks Marc,
Is it shown in the timing side view as brown hoses at top of drawing ? There are two hoses connected and how do I get it out please ?

[GiveMeABreak]

Ok, so if it is on the timing face, the likely culprit can be the water pump tot he Cylinder block.

Information
Sealing

• Detachable seal
• 3 bolts

Probability: Average
Possible Causes

• Incorrect tightening of the fixing bolts
• Gasket sealing fault
• No seal
• Cracks

Access: Average
Repair

• Replace the seal (If there is a leak localised at the seal)
• Replace the water pump (If there are cracks)

[hayden641946]

Thanks for this info and help Marc but I think it is really tucked in behind the EGR exchanger . It is black plastic sort of oval shape and I can only see one mounting screw looking up from the ground as shown in the photo . It must have a name which would show in a proper manual !
Can you recommend a workshop manual for this vehicle as there are various companies selling paper and online manuals .
Thanks
Hayden

[GiveMeABreak]

The problem is trying to localise it and then I can provide some likely leak suspects areas around those places.

I can put up some parts diagrams of the various areas, but we ask for a min. £10 Forum donation for this as we are charged by PSA. But it will cover you for parts info requests for up to 2 years if interested. Details below:

A response to your question by a Forum Admin will require detailed vehicle information that requires you to have made a current contribution to the Forum.

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If this would be of use, follow the links in the table and then pop your VIN up here (automasked on post submission), then I can get some parts diagrams up on the cooling and EGR exchanger.

[xantia_v6]

It sounds like the leak is from the front EGR cooler.

[MGmike]

Not sure if the same applies to the 3.0 but I guess it will...
On a 2.7 in the area below the EGR and above the alternator (where you have drawn) is the water inlet manifold.
A common fault on the 2.7 at around 8-10 years old along with the thermostat housing on the top of the engine.

2.7 coolant inlet

If you haven't renewed either I would recommend doing both at the same time.
I am however assuming the X7 is the same as the C6!