SalemNews.com, Salem, MA

Business

December 8, 2012

Firmware update for 2006 Saturn draws concern

(Continued)

Q: I own a 2004 Chevy Trailblazer, and just recently, I have been hearing a low squealing/grinding noise when I start it. This occurs when the engine is cold. The sound lasts about 45 seconds and stops. About a year ago, I had the serpentine belt replaced. I was wondering if you could provide me any insight on this. The vehicle has 122,000 miles.

A: Noises are pretty hard to diagnose in this column. So, I can only tell you what we see as common issues with your vehicle and vehicles like it. Your SUV may be equipped with an alternator that has a clutch-type pulley. If so, these have been a problem with noise. The other problem we see is with the pulleys that track the belt that run the air-conditioner compressor.

Car Care Tip: This is the time to have your battery checked. When the deep freeze sets in, your battery loses 10 percent power for every 10 degrees less than 60 degrees Fahrenheit.

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Larry Rubenstein is a master technician who owns a North Shore service station. His column appears every Saturday. Write to Larry at The Salem News, c/o Auto Scanner, 32 Dunham Road, Beverly, MA 01915, or send an email to scanauto@aol.com.

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