is the return hose from the heater matrix getting warm ?
this hose feeds the thermostat which sends the water to the radiator.
It sounds like the thermostat is not opening to allow the water to go to the radiator. If this happens the fan will not come on.
It may be the heater matrix is blocked and not returning the water round the system
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1991 90 quattro 20v sport
1991 90 quattro
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