I BELIEVE YOURS POINTS AT 9 O'CLOCK, RIGHT?
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THAT MATCHES WHAT I SAW YESTERDAY.
EVEN WHEN I OPEN THE SHOWER JUST A LITTLE, THE WATER SEEMED WARM. NO COLD ONLY.
CANNOT GET ONLY HOT WATER. ALL YOU GET IS THE MIX OF HOT/COLD SUPPLY LINES.
IF THIS IS INDEED THE CASE, THEN HOT AND COLD CONNECT TO THE TRUE SHOWER AND TUB SPOUT PORTS,
WHICH WOULD MEAN THEY ARE DIRECTLY CONNECTED TO EACH OTHER, EVEN WHEN THE SHOWER VALVE IS TURNED OFF.
MEANING: WIDE OPEN CROSSOVER.