2010 ES 350 It's cold right now in Minnesota and my heat adjustment is acting strange. If I adjust the temp to Hi the air temp coming out of the vents is quite hot. If I lower it to 65, the setting just above Lo, it is still quite hot. Any adjustment between Hi and 65 and the air temp is the exact same, still quite hot. If I adjust it to Lo, the air temp cools way off. Is this a possible blend door problem? I'm not sure where to start looking. Thanks!