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Nov 20, 2008 · The hose which is COOLER than the hottest hose is the one you will bleed (that will be the heater outlet hose) and it will be noticeably cooler than the inlet hose if there is an air block in the heater core. 5. Shut the motor off and let the engine cool. 6. Loosen the hose clamp on the heater outlet hose and wiggle the hose until it is loose.