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We have 4 Silverado’s in the family....not sure if you got a power nozzle with it. The original power nozzle was painted gray to match and model pn4a it was rectangular in shape. A new power nozzle was introduced during the Silverado run and it was an L shaped model much like the current Aerus/Electrolux Lux classic power nozzle and introduced the “Omni-flo automatic” design. Air flow was better all the way around the opening and had better edge cleaning and a total new automatic height adjustment system were the main features aside from a wider and larger brush roll. It has a dark gray almost black plastic cover with a medium gray bumper and a silver label with Electrolux on it. It is model PN5. The pn5 was a definite improvement over the PN4a. In case you were interested.
Enjoy your Silverado, of the 4 in our family, mine has finally run into a motor problem which could be a case of worn out motor brushes but it served me well as my daily house vacuum since 1994 when I bought it used from a vacuum store.
Also the cleaning selector should be set on the 2 through 4 range for normal cleaning. Lower numbers best for carpet cleaning to maintain peak efficiency. 5 and 6 are for special needs such as fine dust that easily clogs the bag. The dial controls the sensitivity of the automatic shutoff feature which monitors suction before and after the bag. When the bag fills with dirt cleaning efficiency is reduced and the feature signals it’s time to change the bag by shutting off, popping the bag door open and the check bag light comes on. If you have lots of shedding pets you’ll likely need to use 1 as the hair doesn’t clog the bag so it will fill before the auto feature shuts the machine off. Don’t run the machine on 5 or 6 for long other than picking up fine dust so it will run to complete the your special cleaning job, after the job is finished set the dial back to the normal setting you use and if the bag door opens change the bag. Running the machine with a more clogged bag will cause motor strain shortening motor life and also allow it to run at a lower efficiency level resulting in not as good suction performance.
Jon