Coolant pressure

Technical Help for the A & K Series Metro. Please state what year and model you're referring to for better responses.
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Coolant pressure

Post by Wibblyp » Sat Feb 08, 2020 9:31 am

I'm getting excessive pressure in the header tank. Builds up on a drive and is still present once cooled down. There's some gurgling from the heater matrix on occasion. Have bled the system and hoses get hot when driven. The coolant system is a nightmare to understand. Besides head gasket failure venting exhaust gasses into the system, is there anything else that could be causing this issue ? 1.8 non vvc,mg rad, head gasket done 6 months ago.


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Re: Coolant pressure

Post by DotMatrix » Mon Feb 10, 2020 9:46 am

I would guess that you still had air in the cooling system.

Dave VVC
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Re: Coolant pressure

Post by Dave VVC » Thu Feb 13, 2020 8:36 pm

Try looking at the inlet manifold where the pipe comes out for the hose for the header tank (near the dipstick), it should
have a one-way valve, it allows air out of the manifold to the header tank, but NOT back to the cyl head, if it does, then
this is a way that air can get back into the engine, its a good idea to fit a 82deg stat as well, as this puts less stress on
the cooling system.

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