My theory is the thermostat is a restriction to the flow, whether open or closed. The pump is moving coolant under pressure through the block, the flow hits the thermostat restriction, resulting in low pressure on the hoses, which are on the suction side of the pump.
If the hoses are in good condition, it should not cause any problems. Once the system builds some pressure they will open up.
If the hose is mushy feeling, soft, it may be damaged by oil. Might check the cooling system for oil contamination. Oil will soften and deteriorate rubber, exposed from the inside or out.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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