It sounds like the fan is on high speed too.I disconnected the thermo switch in the radiator no change.
I have a 1993 Eurovan and the cooling fan is on all the time the key is on. on 1993 Volkswagen EuroVan
We have worked on many Eurovans. It sounds like a relay may be failed in the "on" position.
I have already swapped out the relay and there is no difference
If the relay is removed, does it still run ? If so, the supply wirs is likely shorted to a power source.
NO-the fan stops when you pull the relay.