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overheating


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  • 4 years later...

this may come late but for those who're on the same situation, there's probably a fault on the Thermostat, audi's thermostat are prone to break easily... in  my 2 years of ownership, twice I replaced them (OEM;s), last time, including radiator.. had the cooling system flushed also..

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Hello Aiden

it's a nice car and unique one

Allroad had 2 engines 2.7 turbo charged and 4.2 naturally aspired for both you have to check the following:

- if it's over heating and fans on low speed and radiator still cold (can be touched by hand) so you have a thermostat problem

- if over heating and fans on high speed and radiator is hot and coolant level is coming lower you need to check coolant cap (the blue cap with red warning triangle on it)

-if over heating and fans on high speed and radiator is hot and coolant level is ok but you notice that cooling pipes are hard and indicating high pressure (put something in your hand to protect from heat and squeeze it) that indicate a head gasket failure.

- Engine fan clutch failure can cause over heating after slowing down from high speed (over 140 Km/H)

- if it's not over heating while running AC so the fan speed relay have a problem

- Try to run a diagnostic to check fan speed controller and fans.

Good Luck 

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