Quote:
Originally Posted by Seeker
Alternative title: "Get a grip!"
Obviously, the best way to resolve this would be a pressure test but that means either buying a kit or taking it to a dealer.
This is how I understand the cooling system: it's a sealed, pressurised system running at approx 15 psi. If pressure gets too high coolant is expelled into remote reservoir and as it cools coolant is drawn back into system.
If I did have a rad leak, the system wouldn't be able to push/pull coolant and rad coolant level would gradually drop. It hasn't done that so either my understanding is wrong or I don't have a leak.
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Thats almost how the system works except the rad must be completely full then as the engine heats up the coolant expands and opens the rad cap valve to discharge excess to reservoir. As you say on cooling another valve in the cap opens under rad vacuum and coolant is sucked back. This means that the cap has to seal not only at the bottom of rad filler but also at its top otherwise coolant can leak out on warm up or air get drawn in on cooling....