Blower motor on my '94 Suburban makes noise, only when I start the engine or shut it off. Kind of sounds the same as a flat spot on the tire. BOP-BOP-BOP-BOP-BOP for about 30 seconds. Any ideas? I bought the truck from a farmer so could it be hay, a mouse, feathers, or just needs replaced?

Ticking sounds like a dry lifter, when was the last time you changed the oil and filter? Humming sounds like you need a tire rotation because of uneven tire wear.

check for hangings anything hanging may rub on other items and make a noise... you may have bent a rod for the drive section or cracked the case...look for fluid leaking

Sounds like the blower motor...at low speed it makes the noise due to motor or blower wheel out of balance or something in the blower housing

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The motor has sealed bearings. You need a motor but probably not the squirrel cage. The switch repair was to get the fan working and warranty wouldn't cover the fan.

Try rotating your tires from front to back. It may help with the noise. Get a front-end alignment which can also help with the noise by correcting a "rub" sound that originates from the 2 front tires fighting each other for control.

The place which replaced your bearings is probably correct. When you get bad bearings they do not always fail evenly across the 360 degree turning of the bearing race. If you imagine a donut with a flat spot representing your bearing- as the donut spins with the flat spot cause by a disintegrating roller, the tire is bolted to the donut. The tire is going to hit the pavement differently every rotation because of the play in the bearing is at that same spot.

This play will create small cups in the tire shape at the low spot transmitted by the bearing. When you replaced the bearing , the marks in your tire tread remained. These edges need to be worn off. Or some tire stores can Shave a tire, in an attempt to make it round again.

If you have a normal size spare, you can put the spare on the left front side of your vehicle and see if the noise goes away. If the rims are different on the spare, you can have everything remounted and pay for rebalancing and put the unused spare as a front tire. Then you know the spare is at least good as a spare, but noisy.

Sounds like the blower motor resistor. It should be mounted close to the blower motor. The blower motor resistor may run around $50.00, you may need to replace the plug, dealer item, around $60-70. Shouldn't be $1000.

Sounds like you blower motor is done. The sound may be from the bearings in the motor making noise.

for your first question, there are so many noises that can be found in the front end of a truck. You will need to be ALOT more detailed in your discription.
For the second one; when I first read you question I think fan clutch. Which would be normal for the truck. When fan clutches lock the truck can sound like a B52 airplane taking off.
BUT you say something about the blower motor, so I don't really know how to answer the question. You mean it's a noise inside of the car or a noise in the engine, or a noise only when the ac compressor is cycling in the on position?

Sounds like you have a wheel bearing going out

i want you to feel all 4 tires, feel for lots of flat spots. feel all the way around them. they might have flat spots on them. this will cause this noise. you neer to rotate your tires at 3,000 miles front to back. this will stop them from cupping out. thats what the tire store calls it. have your tires checked for balance when you rotate them. your tire with flat spots will make a good spare tire. switch the bad one to your spare to see if the noise gets changes