Many of us have swapped those back and forth by dealing with the minor
electrical connection difference. 86+ rear A/C uses 2 of them.

Many 86 Westy and all earlier Westy A/C used a different fan setup.

Mark

TJ Hannink wrote:
> Can the blower fans for the heater/defroster be used for the airconditioning evaporator?
>
> The part number for the front unit is 251 819 015 while the one for the A/C is 321 820 015.
>
> Physically they look the same and they are both rated at 300 watts. The only physical difference I can see is the electrical connections.
>
> One online parts vendor told me no, they are not interchangeable, another vendors website says that they are.
>