1999 Acura TL Q&A

1999 Acura TL Question: My car runs hot when the air conditioner is on..the top radiator hose feels flat

The radiator hose feels really empty and flat....we just changed the top hose but its still doing the same thing....when i come to a stop the hand goes to red and then o jave to pill over, let it cool then crank ot and put more water in.....can you please give me some advice about this problem...thanks on advance for your time -
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