Q: 02 XC Z14XE Corsa/Vauxhall loosing coolant. No signs of leaks anywhere. Cars been pressure tested & no leaks or fault's found.

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2002 XC Z14XE Corsa/Vauxhall loosing radiator coolant. No signs of leaks anywhere. Pressure tested and no faults or leaks found. No coolant in oil either. What's happening?
My car has an automatic transmission.

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