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Ford Falcon: Pinging

My AU Mark 2 Ford Futura has developed a pinging noise under load on very warm to hot days with the air-conditioning on. It also boiled on a 35-degree day last week although the temperature gauge did not indicate so and nor did the temperature light come on. The local mechanic suggested that a dirty tank of petrol may be to blame, however I have refilled at a different petrol station and nothing has changed. I am confident that it is not a serious problem such as a cracked head/head gasket as I am not losing coolant and the car starts perfectly every time. The coolant is fresh, as I have had a coolant leak fixed three times in a three-week period approximately three months ago. My gut feeling is that it may be something as simple as a sticky thermostat. Can you shed some light on this problem for me?

It's clearly running hot and could be a sticking thermostat. These Falcons are renowned for having problems with the auto transmission oil cooler, which is located in the radiator. When it goes coolant gets the auto transmission and can affect the transmission if not caught in time, so have that checked.

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