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Knocking sound

Hendo22

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Jan 19, 2021
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Raby
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2008 ve commodore
Hi guys just wondering if anyone has had this problem I have had a knocking sound that is continues happens every 2 seconds there’s not sound while drive but soon as we turn car off it happens every time I drive the car and goes for about 5-10 minutes then stops not sure what it can be has anyone had this problem?
 

rtmpgt

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is it Metallic, ie does it sound like someone smacking a piece of metal with a hammer? If so, take it to a mechanic ASAP.
 

DavesSV6Tonner

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Fill up your cooling system, bleed all the air out and install a new cooling system cap.
 

krusing

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2002 VY L67 Calais Sedan, 2012 VE L77 Calais Wagon
Could be the -
Cooling system cooling down in the heater core and you can hear it in the EVAP system,
Air Conditioner pressure equalising.
Need to rule those 2 out first.
 
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