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Author Topic: Header expansion tank leaking anitfreeze  (Read 872 times)

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VauxVera

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Header expansion tank leaking anitfreeze
« on: 19 May 2014, 21:39:06 »
Hi have had a new expansion tank fitted about 3 weeks ago and today the antifreeze was disappearing. Topped it up with water but disappearing again. Could not see leak anywhere. Called AA they did pressure test and took off top hose heater control unit said that was possible cause. He said he put a bit of sealant in it, seemed okay. One drive later water disappearing again. Anyone got any ideas where the antifreeze/water is going?
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martin42

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Re: Header expansion tank leaking anitfreeze
« Reply #1 on: 19 May 2014, 21:43:28 »
Hbv maybe.
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05omegav6

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Re: Header expansion tank leaking anitfreeze
« Reply #2 on: 19 May 2014, 21:49:24 »
Heater bypass valve is the most likely culprit :y

The leak should stop with various temperature settings, trial and error to confirm though... some leak on lo, some on hi and some inbetween. Only replace with genuine :y

Under no circumstances should you add sealant... it will potentially cost you the heater matrix as it clogs up easily due to narrow waterways
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VauxVera

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Re: Header expansion tank leaking anitfreeze
« Reply #3 on: 20 May 2014, 15:29:47 »
Many thanks for your response. Will order one of the HBV  :y
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