Civic - no air flow on very cold days?

[NCLaker]

Hoping someone can help me with some ideas on a problem with my daughter's 91 Honda Civic.

According to her, no air is being pushed through her vents when it gets very cold out. When the temps outside get warmer it works fine. Any ideas on what might be the cause/fix?

Her current fix is to bundle up extra warm , but that has been getting old with all the sub-zero days this winter.

Thanks!

[Jeremy airjer W]

She cannot here the blower running at any speed when it is really cold, or she has no heat coming out of the vents but plenty of airflow?

[NCLaker]

Thanks for the response airjer ... She has no air flow when it is very cold. Any ideas?

[Jeremy airjer W]

Hers what i would do. When it is not working (cannot hear the blower running at all) I would give the blower a whack (tap lightly with a hammer or the back of a large screwdriver. If it starts to work than I wouldn't hesitate on replacing the blower. If that doesn't do it than I would start checking for power/ground at the blower itself. You can even try jumping power and ground directly to the blower to see if it fires up. If it does than its an electrical issue with some component opening the circuit when its could.

[NCLaker]

Thanks Airjer! We'll give that a try.