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Losing a little coolant?


 
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Helier



Joined: 19 Feb 2018
Posts: 28
Location: Truro, Cornwall

PostPosted: Fri Nov 29, 2019 9:44    Post subject: Losing a little coolant? Reply with quote

My L400 TD loses some coolant over a few days. If I top off the expansion bottle to the max indicator, after four days of use the bottle will appear empty. The car still cools perfectly well, no overheating and takes the same amount of time to reach operating temp.
I can't see any sign of a leak from the expansion bottle itself. The heater still works.
Has anyone got a suggestions for the best places to start looking for the leak?
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PostPosted: Fri Nov 29, 2019 9:44    Post subject: Google Ads keep this community free to join!


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Lewis
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Joined: 25 May 2006
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Location: Huddersfield

PostPosted: Fri Nov 29, 2019 10:26    Post subject: Re: Losing a little coolant? Reply with quote

Helier wrote:
My L400 TD loses some coolant over a few days.


Define how great a volume is 'Some.'

Note that if the pressure in the system exceeds that of the cap on the expansion bottle then the built in relief valve will open and coolant, in the form of steam, will pass down the pipe attached to it, which you will not notice.  Wink





HTH
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Helier



Joined: 19 Feb 2018
Posts: 28
Location: Truro, Cornwall

PostPosted: Fri Nov 29, 2019 10:35    Post subject: Reply with quote

'Some' appears to be the contents of the expansion tank plus maybe another 10%. As noted, there is no evidence of overheating, so I would not expect any excess pressure or there to be any loss through the relief valve.
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Lewis
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Location: Huddersfield

PostPosted: Fri Nov 29, 2019 18:10    Post subject: Reply with quote

Okay.

My first place to check would be the mild steel Coolant connection pipe to the Engine block.
It's located at the back end, on the passenger side, and has a 'Y' shape. It is prone to developing micro holes.

It's fiddly to get at, rrequiring the intercooler and battery / batteries to be removed for access. At the same time the hoses around it may also develop leaks from the connections, which have plastic pipe connectors.

You can see it easier in this image, just to the right of the core plug and below No.4 Fuel Injector.
The metal coolant pipe running around the back of the block is what feeds coolant to the turbo charger.

HTH


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Helier



Joined: 19 Feb 2018
Posts: 28
Location: Truro, Cornwall

PostPosted: Fri Nov 29, 2019 18:19    Post subject: Reply with quote

Great Lewis, thanks. I'll get my eyeball on a stick to try and check it out.
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andyj



Joined: 08 Sep 2006
Posts: 2412
Location: up norf

PostPosted: Tue Dec 17, 2019 19:39    Post subject: Reply with quote

second what lewis said

also the pipes under the car for the rear matrix can go with pinhole leaks, i was losing coolant for months, only found mine using UV dye and lamp.
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unclebazwold
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PostPosted: Thu Dec 19, 2019 23:59    Post subject: Reply with quote

Passenger football is a  favourite a leak.
Bazza Very Happy
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Lewis
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PostPosted: Fri Dec 20, 2019 11:07    Post subject: Reply with quote

unclebazwold wrote:
Passenger football is a  favourite a leak.
Bazza Very Happy



EH ?  Confused

PS: Your signature picture is missing!  Sad
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buzr6mille
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PostPosted: Sat Dec 28, 2019 1:48    Post subject: Reply with quote

If this isn't the case then try the water pump, see if there's any signs of a leak under it, or from it down   Wink
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unclebazwold
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PostPosted: Sat Dec 28, 2019 14:55    Post subject: Reply with quote

Lewis wrote:
unclebazwold wrote:
Passenger football is a  favourite a leak.
Bazza Very Happy



EH ?  Confused

PS: Your signature picture is missing!  Sad

Using a phone to post with dodgy eyes is never good.
Bazza
Ps my piccie seems to be back.
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Allinfisher84



Joined: 27 Jan 2020
Posts: 1
Location: Rockhampton, Australia

PostPosted: Mon Jan 27, 2020 5:42    Post subject: Reply with quote

I chased a small coolant leak around for months in my S2, couldn’t find any signs of leak anywhere. Was starting to get worried that it was a head gasket, but it turned out to be a faulty cap on the reservoir. I didn’t even consider this at the start because I replaced the cap an reservoir when I first got the Deli. But after changing the cap, no more missing coolant
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