407 heat exchanger

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moizeau
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407 heat exchanger

Post by moizeau »

Evening all, I was about to do a bit of AM6 preventative maintenance and noticed a leak from the 'heat exchanger' under the drivers side. I can't find it in the BOLs or on servicebox. The water leak is from the front edge, I've not removed the cover to see where exactly. Is this a known issue and can anyone point in the right direction regarding parts diagrams.
Cheers

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EDC5
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Re: 407 heat exchanger

Post by EDC5 »

Which heat exchanger is leaking exactly? Could you get a pic of it?

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GiveMeABreak
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Re: 407 heat exchanger

Post by GiveMeABreak »

Ok, so best to do a clean and watch session to identify leak and then let me know which are the suspect zones from either of the 2 diagrams:

These are the Coolant Leak Zones for the Engine Circuit:
Pete Leak A.PNG
Zone ATiming face
Zone BCoupling face
Zone CExhaust face
Zone DInlet face

This is the circuit away from the Engine towards the Radiator
Pete Leak B.PNG
Zone "A"Area of header tank
Zone "B"Area of coolant outlet housing - Exhaust gas recycling
Zone "C"Area of cooling radiator

moizeau
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Re: 407 heat exchanger

Post by moizeau »

This one is horizontal and lies under the floor pan behind the engine on the drivers side. I'll get a photo tomorrow

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Re: 407 heat exchanger

Post by GiveMeABreak »

Are you sure that's not the water evacuation drain pipe from the Air Conditioning Evaporator?

moizeau
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Re: 407 heat exchanger

Post by moizeau »

I hope you're right Marc, I'll check tomorrow and take a pic. Thanks

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Re: 407 heat exchanger

Post by Abdul »

Check the water pump

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Re: 407 heat exchanger

Post by RichardW »

Is it diesel? These have a fuel cooler under the floor that fits your description. Air cooled though, so no water...

moizeau
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Re: 407 heat exchanger

Post by moizeau »

Yes it is Richard, and having cross checked your comment with the BOLs, yes, it is the fuel cooler that I was looking at thanks for clearing that up. Looks like a radiator on the back of a fridge.
So if the AC drain is near the front of this, that is the 'leak'? I can't find reference to it to confirm. I really hope your right Marc.
I can't get under it today due to the lovely French rain, but I don't think it's necessary now.

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Re: 407 heat exchanger

Post by RichardW »

AC drain, item 8
heater.JPG
This view is from the front of the car, so the drain appears to exit on the RHS - I assume yours is LHD so it should be on the passenger side somewhere. However, that's not to say it's not running across the subframe and dripping off a low point somewhere. I would check that it's not diesel leaking, however.... but having said that these coolers rarely give trouble.

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Re: 407 heat exchanger

Post by moizeau »

Thanks very much Richard. Mines a RHD the the positioning would be correct. I held my hand under the drips when I saw them, give them a smell test, definitely water. That puts my mind at rest.
Thanks again to both of you.

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GiveMeABreak
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Re: 407 heat exchanger

Post by GiveMeABreak »

There shouldn't be any difference in these for LHD or RHD - the heating units are the same for both.

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Re: 407 heat exchanger

Post by RichardW »

Indeed, Marc, but it would vary whether the drain was driver or passenger side!!

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GiveMeABreak
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Re: 407 heat exchanger

Post by GiveMeABreak »

Well it's a flexible hose so can easily be moved by somebody / past mechanic?, but the parts are in the same place and there's no different versions for either model, which was my point really. :)