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The cooling fan relay for the 2007 Audi A4 is situated in front of the driver's side within a plastic box held in place by four or five bolts, although the back two bolts may be challenging to remove, so be careful not to damage the box cover. To identify the correct relay, with the engine off and the coolant fans running, remove one relay at a time until you locate the correct one. This relay plays a crucial role in controlling the power supply to the engine's cooling fans, ensuring that these energy-demanding components operate only when necessary. When the engine temperature reaches unsafe levels, the vehicle's computer or temperature switch triggers the cooling fan relay into action.
Beneath the hood