What was found
AFTER REMOTE DE-ICE THE FLIGHT DECK BECAME EXTREMELY HOT WITH NO CONTROL VIA CONT CAB TEMP CONTROLLER. FOLLOWED QRH, PACK RESET, OPERATION NORMAL. WITH IN 2-3 MINUTES SAME PROBLEM OCCURRED. RETURNED TO GATE. GROUNDED - YES. PER B737-900 FIM 21-53 TASK 820, OPENED ACCESS PANEL ON LH AFT PLENUM/DIFFUSER. RAN LH PACK AND FOUND ACM BLADES NOT MOVING. SUSPECT A BAD LH AIR CYCLE MACHINE. FOUND NO AIR COMING OUT OF THE PACK EXHAUST. LH PACK LIGHT COMES ON LESS THAN ONE MINUTE AFTER TURNING PACK ON. REMOVED L/H AIR CYCLE MACHINE REF B737-900 AMM 21-51-04. L/H AIR CYCLE MACHINE REPLACED REF AMM 21-51-17. LEAK CHECK GOOD. OPS CHECK GOOD TEMP ON GAGE INDICATES BELOW 10 C WHEN SWITCHED TO COLD. ACCOMPLISHED PACK/ZONE TEMPERATURE CONTROLLER BITE REF AMM 21-61-00-700-806-002 NO FAULTS/DEFECTS NOTED. LEFT PACK LIGHT EXTINGUISHED.