I did a search for fan wobble and fan shake and didn't see anything similar to my issue. There is a noise being made by the fan. I know it's the fan because it keeps going on after shutting the car down till the fan stops spinning and I've seen it. Apparently the fan has started to wobble for some unknown reason. The wobble gets so bad that it tries to pull the shroud away from the radiator thus causing noise similar to a playing card in a bicycle tire at slow speeds. I thought it was a cable at first untill I saw the fan spining. It's almost like it's out of balance.

The blades should still be fine. They were fine a few weeks ago when I swapped on the fan motor from my 88 Camaro because the 92 Camaro's motor gave out. The only tight fit was the motor going into the shroud. Apparently the 92's motor is lsightly thinner. There isn't enough flex during the wobble for the shroud to have broken though.


Any ideas?

 

I yake it you're speaking of the single electric fan(as appossed to the duals).Was there a spacer between the fan and the motor when you disassembled it?Did you inspect the fan assembly itself for cracks or separations?I don't remember whether there are any weights on the single blades or not.If you have another fan assembly to try would be a good idea.You're right on the motors being basically the same.The replacement motors are the same(I've used Siemens fan motors P/N PM517,IMHO they are the best).

 

Yea, sorry it is a single fan setup. There was no spacer invovled and the fan wasn't damaged at all. I looked at both the 88 and the 92 fan to see if they were different and after seeing they were the same I looked to see which was in better shape. The 88 was dirtier, both were in the same shape, I went with the 92 fan. I torqued the bolts down pretty good and seeing as how they're reverse threaded they shouldn't have backed off.

I guess I'll have to deal with the cold today and just pull the whole shroud back out and look at everything to see what the deal is.

 

Maybe the bearings in the fan are shot.

 

Try checking the motor shaft for movement side to side.That would indicate worn bearings.If it checks ok try running it without the fan.Then I would try the '88 fan and see if you have the same problem.A problem like this is trying to track the steps of what you've changed to pinpoint the problem.At least that's what works for me when troubleshooting.

Edit:LOL....Ringo cut to the chase while I was typing.

 

perhaps the motor is a replacement off brand? I say this because I bought a fan motor (It was A/C Delco) either for my bird or Pontiac 6000. Turned out that everthing was the same except the fan itself wouldn't bolt up right to the motor. Turned out to be the correct motor, but the replacement motor used a specific fan produced only by A/C Delco and not the original stock fan. THe fan would go on but wouldn;t bolt up right and I Imagine would have wobbled a lot if I "made it work". Anyway, just thought I'd share.

 

I went ahead and pulled it all out yesterday and examined it. The motor was all kinds of jacked up. It would hardly spin at all and I thought the shaft was going to fall out. Good thing I neer took the new motor I bought at Autozone back in December back for a refund.

I'm not sure the fan is running at all anymore though. I need to look at the fuse later today. Maybe it's just running proper now instead of from the second the ignition goes to the on position till I turn the engine off.

 

You can test your motor (and relay/wiring) by pulling the wire off the pass side temp switch and grounding it. With ignition in run it should engage the fan. That's all the temp switch does, provide a ground for the circuit through the engine block.

This won't tell you if your temp switch is bad though.