Hi dawenh,
Thank you for the donation.
I don't believe the tensioner is causing the problem.
The fault should lie with the air mix door and its controlling links.
When problem happens again, turn the heater knob to maximum and then back to cold to see if it works. Sometimes the air mix door gets stuck and does not close correctly resulting in the heat instead of cool air.
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Sunday, July 12th, 2009 AT 2:10 AM