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Q:

windsheild wipers only operate on the fastest speed. on 2004 Hummer H2

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windsheild wipers only operate on the fastest speed. all speeds were working yesterday. does the motor did replacing? Where can I obtain step by step instructions to replace? Many thanks.
(1) Answer
Step by step instructions will be in a repair manual that you may be able to get online or likely at a parts store. The rheostat that controls speeds is likely bad. It is a progressive resistance circuit that builds ohms resistance to control the speed. May be a seperate part or in the motor or a prob with the speed control in the vehicle.