A/c - Heat All Of A Sudden Stopped Working Correctly

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A search didn't show a thread about my problem.

This past Saturday, I descended a nine-mile road on my bicycle in 55-60 degree temperature. No suprise that I was quite chilled afterward and after loading up the bike onto my 2006 RX400H, I headed home and cranked the heat to "MAX HOT". Good! Nice and toasty to warm me up. So much so that after a few minutes, I reduced the temperature "one click", and the heat went way, way down. Not incremental as it used to do.

Then I remembered earlier in the day that the "MAX COOL" really wasn't all that cold. It was only in the low 90s outside, and the A/C usually blows real cold. It didn't that morning.

Any idea what is wrong with my A/C-Heat system? All else seem normal.

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