Might be just the fan then, and tolerance issues.
Mark
performance@everlastwelders.com
www.everlastgenerators.com
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My Power MTS 211Si was built a couple months ago... when it gets colder, I'll report back here to see if it's an issue with my machine or not.
I may have to add a little propane or wood burning stove in the base of my welding cart, LOL!
I agree with previous posts - I used to live in North Dakota, and have had to weld on many -30*F (or colder) days. This is clearly one way in which technology is NOT helping us progress. Having a welder that "is impossible to market to cold environment customers" will kill 30%-50% of your potential customer base. The Alaska Pipeline would have NEVER been built.