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Matt
Matt, Engineer
Category: Australia Car
Satisfied Customers: 21602
Experience:  Automotive Engineer for 20 years, BEng hons degree,
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Marty Weird one last few days, loosing colant. very gradual

Customer Question

Customer: Hi Marty Weird one last few days, loosing colant. very gradual loss cant ***** ***** source of leak. suspect it is coming from front (Left) of vehicle if standing in front of it. (Im in Aus so RHD) Cant seemd to find any hoses leaking, have gone under car, cnt see any visual signs, yet small puddle on the floor, Thinking a hose or possibly radiator tank but still cant see any visible signs of leak? Any ideas based on your experience? Secondly, want to re set the gearbox, adaptive drive. Can i do this by disconnecting the battery and draining for a period of time or scanner needed?
JA: Thanks. Can you give me any more details about your issue?
Customer: As above
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Submitted: 1 year ago.
Category: Australia Car
Expert:  Matt replied 1 year ago.

Hello

If you have a tiny pinhole leak in a radiator then these often don't leak water but will lose water as steam ( steam molecules being small enough to pass through the hole where liquid cannot) take a look on the rad for any signs of localised corrosion and for areas that look like they've been 'steam cleaned'.

If all of this is OK it may be worth replacing the header tank cap as again you can lose coolant as steam if this is blowing off too early ( the cap should hold pressure of around 1Bar)

The other thing to try is a head gasket / block test kit as these take a coolant sample and analyse it for any signs of combustion gas - if present this would indicate the head gasket is on its way out

http://www.uktools.com/block-tester-p-12508.html

Also I’ve known a tiny leak from the heater matrix to be emitted as steam in the same way as a pinhole on the radiator so you can check the surface of the matrix for dampness and if you do find it then either replace the part or try one of the coolant sealing products – this one is particularly good

http://www.kalimex.co.uk/section.html?secpath=01.04.&pgid=17

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Expert:  Matt replied 1 year ago.

Hi

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