Question: how to fix a squeaky window air conditioner?
Answer: Step 1 - Make Sure the Unit is Properly Installed. The annoying rattling sound you hear may simply be because the air conditioner is no longer tight in the window frame. ... 
Step 2- Check Front Panel Screws. ... 
Step 3- Examine the Fan Blades. ... 
Step 4- Lubricate the Fan Motor. ... 
Step 5- Straighten the Coil Fins.