1971 A/C Blower Motor
I was told if I put 12v to the purple wire on my blower motor I can test it. I tried it and got nothing. There is a capacitor looking thing inline with the purple wire at the blower motor. Do I need to give it 12v after the capacitor or is my motor fried?
You can hook a wire right from a 12 volt source to the spade on the motor your probaly looking at removing the motor any way once it's out check it with a ground and a hotlead to a battery, but before you go to the trouble disconnect the ground wire and make sure it has a good connection. I just upgraded to a bigger blower while I had em out I hooked them up to my boat battery just to see the differnce in speed
Melting Slicks







Joined: May 2002
Posts: 2,717
Likes: 121
From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
The blower is mounted to a plastic box. There should be a ground wire connected to one of the mounting screws that holds the blower to the box. Make sure the ground is connected and in good shape. If the ground is good and you connect 12 volts to the spade on the motor it should run (if the motor is good). Hope this helps
Neal
Neal
I am reworking my AC at this point. The fan motor is held in by 5 screws that are easy to get to. Watch out for the ground spade that is attached to one of them, it gets lost easily. I upgraded my blower/motor as jeaux mentioned and it definately is helping with the air flow. If you are interested I have a upgrade spacer I will let you have. The new blower/motor is from a '95 Vette and ran about $60 at NAPA plus the rubber air intake tube is $10 from Chevrolet. If you are interested, I'll find the part no's.
Jeff
Jeff
Thanks for looking into that. As soon as I can get a few hours I will get back to the Blower Motor problem...I need to try to get it to blow to see if its bad. I was hoping it worked and it was just something in the wiring but, I'll have to check that ground.
Originally Posted by ragtop73
I am reworking my AC at this point. The fan motor is held in by 5 screws that are easy to get to. Watch out for the ground spade that is attached to one of them, it gets lost easily. I upgraded my blower/motor as jeaux mentioned and it definately is helping with the air flow. If you are interested I have a upgrade spacer I will let you have. The new blower/motor is from a '95 Vette and ran about $60 at NAPA plus the rubber air intake tube is $10 from Chevrolet. If you are interested, I'll find the part no's.
Jeff
Jeff
It is my understanding that the '95 has the largest and most aggressive cage/ blades. It should be pushing the most air and still maintains the C3 bolt pattern so it lines right up. I have used both high density polyethylene and nylon. They can both be turned on a lathe. Both are light and don't rot. The hook up is going to be the same for either fan. One uses a spade bolted to the housing and the other has it as part of the plug. I will be running heavier guage lines via the starter lines, so it doesn't matter with mine. The hole does not need to be enlarged. The cage clears easily.
The cage is mostly responsible for the greater flow. So just adding more juice won't do it. You will need to pull it back out to test, but put a strip of tape around the lip of the opening. rPut it together and un the fan for a while. find where it rubbed and file that area down a bit.







