Why the temperature raise dramatically in a slow traffic ride. on 2003 Audi A6 Quattro

i saw the temperature gauge showing 1 notch before the H mark in a simple slow traffic for three blocks i stop the car and opened the hood, the fan did not work, the fan after i usually park the car begins to runs after a few seconds, in this case the fan simply dosent work

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1 answer
check fuses and relays first, if the are good test the fan motor, also temp sensor..