blower motor increases with engine rpm

[nicknorth11]

When my RPMs increase, my blower motor gets stronger. When my RPMs decrease, the blower motor gets weaker. It's extremely noticeable. I'm inclined to think it's an alternator or battery issue, and I'm planning on taking it up to autozone this week to have those things tested, but I was hoping you guys might have some additional ideas I can look in to just in case.

 

[Black Widow97]

I would say charging system with the info given. Do the headlights or dash lights or anything else dim with the blower motor?

 

[cookmeup272]

Sounds like an alternator to me, mine does the same thing and my alternator is bad. Didn't do it before either.

 

[nicknorth11]

Black Widow, I haven't noticed anything else dimming, but I haven't really paid attention either.

Thanks for the help guys.

 

[MJBean420]

Yeah, take it to AZ to start. Have them check the charging system. Check the belt too. Make sure its tight.

Turn some of the electronics on(defroster, radio, etc) and see if it effects the power output at idle.

 

[DSM1G90]

I call it a weak battery ( or, bad and/or dirty connections) since the ALT has to keep charging it all the time. If so, that weak battery will take out the ALT and you'll then have two bills on your hands.

 

[nicknorth11]

Just had the charging system checked and everything was good.

 

[1Bad4G63T]

perhaps it's some kind of voltage regulator? Had something similar to this happening on a mercury cougar my brother owned...turned out that it was some type of voltage regulator that was allowing too much of the current from the alternator through to the blower motor.