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owner 2005 XLR since april 2016. Enjoying my ride . Do have a couple of questions though. It seems car runs rather hot when in traffic temp little over 220. Other question there is rectangular attachment to windshield just to right of rear view mirror. have not figured out what it is.
I've experienced the same with my 2005 XLR, it runs hot (220) when in traffic and immediately cools off as soon as you begin moving again. I ran it in my garage this summer with it lifted in the air so I could watch the fan come on and turn off while monitoring the temperature with a scan tool. If I remember correctly the fan came on slowly at about 215 degrees.
The long black rectangular box on the windshield to the right of the rear view mirror is the OnStar and Navigation antenna. The rainsense module is below the rear view mirror.
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