I've got a 2002 Jeep Grand Cherokee Laredo. Since the temperature drop near Chicago this year, I've noticed that my heater blows semi-cold air at full blast. The temperature is all the way hot. If I decrease the blower, the temperature air seems to be warmer, but still not enough to really heat the car. I'm thinking it's the heat blend doors and I've seen really nice replacement instructions at reasonable cost. How do I know FOR SURE if it is the flaps and not something else? I don't want to cut into my heat blend to find out it's fine.
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