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No Fan - heat/AC/Vent

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2000 VNL 770 Detroit Auto

Heater fan stopped working, 40A heater fuse designated : MF5 40A CAB HEAT is good.

Any experience or insights?

Pulled dash heat/ac control sub panel, looked good.

Going to pull pass side dash covers and check fan connection.


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16 hours ago, Steve from SoCal said:

I don't know about YOUR Volvo, many older cars and trucks have a resistor pack in the HVAC plenum to control fan speed.     That or the fan motor has given up the ghost?       



Agree, the resistors don't usually give up all at once. The low speeds tend to go first.  If some speeds are working and some not, that's the usual indicator in old cars.

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Fan motor? Oh joy, I’ve seen what it is going to take to get to that level. I wonder if I could get to the motor connector and apply some power from an external source and see if it runs before tearing into the air box?

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Problem solved! Got the fan motor assembly out and powered it off a battery... no joy.

Ordered a new motor assembly on Amazon and once installed everything works like a charm.

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