How to find Audi a3 1.8t sport relay switch for coolant fan.

possible stuck fan relay relay remove relay and test with a meter

There are dozens of possibilities from as simple as a bad pressure cap or low coolant level to as bad as a cracked engine block. Knowing the conditions that cause the overheat would help diagnose, here's some basics--assuming the coolant is full. Only overheats at low speed is generally an airflow problem: fan not running because of a fuse, relay, temperature switch, or dead fan motor. Only overheats at high speed is generally a coolant flow problem: radiator is plugged up, faulty thermostat, water pump vanes damaged. Tell us anything you've checked, any recent repairs done, and the conditions under which it overheats.

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First check fan fuse and relay if they are good then the coolant temperature sensor could be faulty.You can cross the two wires going to coolant temperature sensor and if the fan comes on then the coolant sensor is faulty.Make sure the ignition switch is on when you cross the two wires.

You can put those on an independent switch. The sensor for the gauge is mounted on the bottom of the coolant inlet neck on the left side of the engine, it is actually called an Electronic Thermoswitch. The fan relay has most likely gone bad.Here's the fan relay location, remove the kick panel above driver side feet. It's the one behind the big #287. Double check on the coolant sensor located behind the engine on the drivers side.

SOUND LIKE FAULTY CLUTCH FAN OR THE AUXILIARY ELECTRIC COOLANT FAN NOT RUNNING. CHECK AUXILIARY FAN FUSE AND RELAY. IF LOOK GOOD HOT WIRE TO SEE IF FAN TURNS ON IF NOT FAN FAULTY. IF FAN RUNS YOU HAVE FAULTY THERMO SWITCH. WHICH LOCATED AT THE BOTTOM OF RADIATOR ON THE LEFT HAND SIDE OR ON THE LOWER RADIATOR HOSE ON THE RIGHT HAND SIDE OF THE ENGINE COMPARTMENT.IF FANS OKAY COOLANT LEVEL CORRECT.REPLACE THERMOSTAT.HAVE RADIATOR AND ENGINE FLUSHED.CHECK IN FRONT OF GRILLE MAKE SURE NO DEBRIS BLOCKING OFF AIR FLOW THROUGH RADIATOR CORES AND AC CONDENSOR CORES.

You will need to go on the web and just type in the year make model and repair manual and a few sites will pop up, theres a few thing that would cause the fan to be hot wired.a bad fan relay which is the most common problem this is located on the driverside shock tower area,it has the relay and the fuse, and the coolant temp fan switch may also be bad,

CHECK COOLANT LEVEL IN RADIATOR. BUT WAIT UNTIL THE ENGINE COOL DOWN. CHECK WATER PUMP.IF YOU SEE COOLANT LEAKING FROM WEEP HOLE REPLACE WATER PUMP. REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP WHEN CAR OVERHEATING IF CAR AT A STANDSTILL IN LONG TRAFFIC LINE OR MOVING SLOWLY.COOLANT TEMPERATURE SENSOR FAULTY.NOT TURNING ON COOLANT FAN.CHECK COOLANT FAN FUSE AND RELAY.IF ALL IS GOOD.HOTWIRE COOLANT FAN.IF COOLANT FAN DONT COME ON FAN MOTOR FAULTY.IF FAN COMES ON CHECK ELECTRICAL WIRE CONNECTOR FOR DAMAGE WIRES.

Have you tried a fan relay?
I'm thinking there is a coolant sensor AND a fan sensor on that model.

Check relay & coolant temperature switch.

it could be a faulty fan switch, or faulty engine coolant temp sensor or a faulty fan relay