My dyer is makes a loud, rattling sound.

I would think the honeycomb ceramic "Brick" inside the Catalytic Converter has broken up, makes a terrible rattling when this happens.

Hello & Welcome to FixYa

Awful noise that sounds like its out off balance comes when the belt is either broken or worn out and needs replacement. If you want to do this yourself then you can check this video on youtube:

Hello there,
Try using other brush attachments, as broken bearings in a brush attachment will cause noise. If these troubleshooting techniques do not work, you may need to service the engine.
Remove the filter and bag of the machine and make sure that they are not clogged or full of debris. Clean any filters according to the instructions for your model or replace the bag. Excessive debris will make the engine run noisily.
Inspect the hose of the vacuum and remove any large debris that may be clogging the inside of the tube. Large amounts of dust, as well as stones or other hard materials that bounce, may cause a loud noise in the engine.
Remove the housing that conceals the engine of your machine and inspect the fan for damage or clogging. Remove any dirt or debris that may hinder the movement of the fan. Inspect the fan for any damage such as bent or excessively sharp blades. Replace the fan blades as needed; contact your vacuum manufacturer if the fan is damaged. The replacement part will include instructions.
Tighten the fan with a ratchet if it is loose on the assembly. A loose fan will make a rattling sound as the motor revs.
Wipe dirt and dust from the frame of the engine. Large quantities of dirt or dust around the motor can cause it to overheat, which can cause vibration and loud noise.
Look for corrosion around the engine. If the engine is corroded, it must be replaced.
Grease the bearings of the engine if you hear a grinding noise from the vacuum. Greasing is often performed through ports in the engine, or by removing the bearings. However, the actual greasing method is model-specific. Consult your owner's manual or send the vacuum to a service professional for this service.
Inspect the inside of the vacuum cleaner for other worn parts or broken pieces. Worn or broken pieces can cause loud noises to occur. Remove the broken part and order new materials from the vacuum manufacturer or take the machine in for service.
Hope this information was helpful to you. All the best. Elect_Comp

the fan clutch is stuck not allowing the fan to free wheel like its designed at an idle Replace the fan clutch

There could be multiple problems with you whirlpool dyer depending on the type of noise you are hearing. If the noise is a low grumble or loud buzzing sound this could indicate a bad motor. Which could explain you not hearing the drum turning. If however you hear a grating or grinding type noise but the drum is turning, this could indicate that something is rubbing or has become jammed inside the blower fan that circulates the air. if this is the case it too may have to be replaced. Also the drum can sometime come off the drum support rollers at the back of the dryer, but this is very uncommon, and only happens if they are very worn or broken. This can easily be diagnosed by a technician and if the motor is fine, will cost little to repair.Hope this helps.

Thanks

tighten fan

some debris make have entered the blower fan, remove same and check for debris

Hi, Can you tell if the noise is in the lower front? It sounds like maybe the blower wheel has went bad. I can assist you further in this if you need.

Thanks
Vic

Hi, It sounds like the blower wheel is bad. This is a common problem.
While the dryer is running, listen to the front lower left corner and see if you can pinpoinnt the noise area.
If this is the case, please let me know if I can assist you further.

Thanks
Vic

Concerning your broken vent -- this can be caused by a broken linkage or a malfunctioning servo motor as well. these vent have air ducts the sway back and forth to adjust the dual air flow function. if the servo o linkages are malfunctioning or not connected for some reason, it will not allow total control of the air flow and temperature range. Now, if you have a combination of a flow error and temperature error as well, thai can be caused by a combination of the two.

In this case, you will need to inspect the linkages as well as the servo motor function as well. in addition, i would test the air temp sensors for there operational value. they control the temp when you adjust the coll or hot function.

Concerning the Loud noise coming from the blower fan---

This issue can be caused by a misalignment within the blower housing or, it can also be caused by some minor damage within the motor itself, causing it to rotate in a erratic manner, in return, forcing it to rub against the housing itself. the best solution here is to extract this blower fan housing and inspect for lose fan propeller and motor stability. replace parts accordingly.

PLease rate and have a great day:)