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Q:

Forced air fan (heating/cooling) runs only in hi-speed position. on 2001 Dodge Ram Van 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Noticed issue recently.Both front and rear fans (heating/cooling)behave the same
(1) Answer
It'd be unusual to have this problem in both heating systems at one time, but it sure sounds like faulty blower resistors or switches to me.
An auto electric shop or a Dodge specialist may be able to help you.
If you want to find a Dodge specialist, here's our directory link for you:
https://repairpal.com/directory?address=77336&car_brand_names=Dodge