Help: Noisy cabin temperature sensor blower

1989 124 250D, signalrot
My cabin temperature sensor blower - the one sucking cabin air into a sensor under the glove compartment is noisy (especially when it's hot
outside), sounding like a CPU fan being out of balance.
Should I replace it (easy) or is there a good trick around to make it silent again?
Thanks in advance, Christian from Denmark
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