99 Service light on (wrench light, not service engine soon light)..help!!

Ok, so earlier today I was having battery trouble, and let my car idle in the driveway for about 15-20 minutes after coming back from the store, so that I wouldn't have to get a jump because I was leaving again soon...I went to get in my car, and smelled something burning, similar to that of brakes, but more like electrical...I got in the car and noticed the temp gauge was up about 3/4 of the way, which is unusual, its never gotten that high and its 5-15 degrees outside in northern michigan....anyway, the service light was also on, I immediately turned the heat on full blast, and drove the car, and the temp went down to normal. Went to autozone to have the codes read, and it came back with nothing...went to the local garage and had them check the battery and alternator, and said everything was fine, and that it must just be the cold cold weather we've had lately that was keeping the battery from starting the car...anyway, what could cause that foul smell? I've driven the car for about 100 miles, it drives normal, i've smelled that electrical/brake smell once when driving down the road for about 20 seconds, and then it goes away...any ideas of what to check? Next steps to take? Perhaps the fan quit working and the motor burned out? How could I check the fan? Any ideas are greatly appreciated...thanks!

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oh123
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Supply power directly to fan.

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