Ok, today I went and pick up a new blower motor because my other one was shot. To make a long story short I put it in and it didn't work. So I went back under the hood and wiggled the wires to see if that would fix it. It didn't so I thought maybe my switch is bad. So I got a volt meter and there was around 7.8 volts at the first three positions and nothing at the 4th (fastest) position. My question is, what should the volts be at and what determines the speed of the motor. I tried to figure this out my self and I went to my dads truck to see what his fan was running at. His varied from 12.3 at the lowest position to 12.5 at the highest. I wouldn't think that .2 volts would make the fan turn at a different RPM. Also I heard a clicking noise coming from a relay or a seloniod near the fan, everytime we changed speeds on the motor it would click. So I guess I couldn't answer my own question with my dads truck. So can you guys please help me!! Any other ideas on how to diagnose/fix my problem would be great.

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yellow 86 Camaro
LG4 700R4
Pioneer head unit
Kenwood speakers
Infinity Beta Digital 300 amp
2 Infinity Perfect 12s

 

also, I was reading another post that mentioned that really that I was talking about. Is there anyway to tell if that is bad? Since mine doesn't click like my dads, it could just be that my relay is bad.

and another thing. would it be safe to test these little motors with a battery charger. I put my old one in a vise and hooked up a battery charger to it to see if it was bad or not. At first it spun really fast, then I took it off to move the amps up and it wouldn't go again. So I wonder if I blew the motor by hooking it up to the battery charger?

[This message has been edited by matthew (edited January 02, 2001).]

 

well I got a new relay today and it didn't help. My volts even droped a little to 6.9-7.1. Does anyone know how many volts it takes? Since everything else is good, do you think it must be my switch? Do I have to replace the entire HVAC control thing or can I just replace the switch?

 

Have you checked the connector in the brown wire that feeds power to the control head yet? That's usually the cause of this problem. Check it, it's easy and free to check, and very cheap and easy to fix.

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"So many Mustangs, so little time..."