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cumminsdr, Mechanic
Category: Vauxhall
Satisfied Customers: 3786
Experience:  All types of Cummins applications
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I wonder if you can shed some light on my astravan pressurising

Customer Question

Hello I wonder if you can shed some light on my astravan pressurising cooling system problem.first of all is there a one way valve on the top up bottle outlet into engine because tube runs from bottle to a y branch on left hand side of engine attached to hose direct on to water pump and bottom radiator what's happening is when engine is hot and under load ie revving bottle fills back up through top up hose with it being so close to pump outlet?
Submitted: 2 years ago.
Category: Vauxhall
Expert:  Shantal-Mod replied 2 years ago.
I'm Shantal and I'm a moderator for this topic.
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Expert:  cumminsdr replied 2 years ago.
The rad cap may not be venting properly or This is a sign that the head gasket may be failing and allowing combustion gas into the cooling system from a failed gasket. To confirm this you need to buy a combustion gas in cooling system detection kit. This can be bought at any parts store and if it comes back positive the repair is to replace the head gasket and inspect the components removed.