Check coolant level and top off with G12 VW coolant only or filtered water.
If you haven't replaced your water pump, chances are it could be the
original part (OEM). This use a composite material impeller similar to
hard plastic. They are prone to cracking at the shaft connection for
the pulley and doesn't spin with the engine. Replace it with an
aftermarket part which have metal impellers. I'd advice to invest on
replacing your timing belt at this time because the water pump is
behind the belt. Also keep in mind to use G12 only coolant (VW red
coolant), these are phosphate free keeping the system cleaner. Your A/C
when switched on automatically activates the fan to lower engine temp
when the compressor adds extra loads to the engine.
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