not really,
the problem is not the seal, its the valve. This valve opens if to much pressure is in the cooling circuit, and if cooling fluid is missing in the circuit. Without pressure (cold, not running engine) water can get from cooling fluid reservoir through the cap into the cooling circuit.
If this valve inside the cap is old and damaged, it did not close. In this case, the cooling circuit cant set up pressure. Without pressure water boils at 100 degree celsius. With pressure its at +/- 120.
If the cap is not working perfekt, you can often hear a sound like an old coffee machine out of the cooling reservoir.
Rene
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