thank you for all your thoughts and helpful links. i have disassemble the waterpump and found maybe the reason. with the last assembling of the pump i have used maybe to much sealing silicon. you can see i have closed one hole in the watercircuit between pump and engine. i will take care with the new pump and use less silicon on the seal. in any case if this hole free, i will have more circulation. thank you, best regards Josef
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