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Thanks everyone for your advice. I have purchased new overflow hose...will advise on the outcome when fitted and tested!

No, not on LPG. Yes, is an auto (5 speed). Car regularly serviced every 10,000km. Has travelled approx 3,000km since last service in November. Gearbox serviced less than 12 months ago.

Thanks for the advice....it is appreciated. The return vacuum seems to be lost - coolant is pushed out, but does not syphon back to the radiator from the overflow tank when the motor cools. Hence the need to top up the radiator when the motor is cold. Will check out the overflow rubber hose...

My VZ Calais is loosing coolant and requires a top-up of 300-500mL after a trip of only 60-100km. Floor of the garage is wet at the front of the car - under front bumper. Water pump and radiator cap have been replaced twice in the last three months. (Genuine Holden radiator cap used the...