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Dr. Hamman
Dr. Hamman, Automotive Engineer
Category: Car
Satisfied Customers: 6286
Experience:  30 years experience, Repairing, building, & designing, automobiles.
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Why Would A Blower Fan Slow Down When I Am Climbing A Hill

Customer Question

Why Would A Blower Fan Slow Down When I Am Climbing A Hill On My Express Van? 2004 Express van 3500
Submitted: 4 years ago.
Category: Car
Expert:  Dr. Hamman replied 4 years ago.

Dr. Hamman :

Hi, I am a professional certified mechanic, with an engineering background, and 35+ years experience. I will do my best to assist you. Also keep in mind I don't know if you are a pro or a novice so we may have to fine tune the answer. Feel free to add any additional info you feel is needed as we go on. Always keep in mind that I am here to help you with any questions.

If the actual blower motor is just about worn out, it can have what is known as endplay. That is where the motor shaft can be pushed in, and out a bit because of wear. On an incline the endplay can switch to one side or another, and slow the motor down, because of friction. Normally if this is the problem the blower motor wont be quiet, and it will have a few strange sounds. That is the only thing I have ever seen slow a blower motor down. If you have any more questions, as always, I am here to help. Good luck with it, have a great day, and Thanks for using Just Answer.

I do not get paid for my work unless I am given 3 - 5 stars/smile faces. If the answer is not clear, let me know what additional help you need, and I will assist you further. A bonus and positive feedback are always appreciated, good luck and Thanks.