F 450 4WD Super Duty V10-6.8L VIN D (2004)
Coupler HVAC: Description and Operation
SPRING LOCK COUPLING
The spring lock coupling is a refrigerant line coupling held together by a garter spring inside a circular cage.
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When the coupling is connected together, the flared end of the female fitting slips behind the garter spring inside the cage of the male fitting.
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The garter spring and cage then prevent the flared end of the female fitting from pulling out of the cage.
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Three O-ring seals are used as a seal between the two halves of the A/C condenser core couplings, all other couplings have two O-ring seals.
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Use only the O-ring seals listed in the Ford Master Parts Catalog for the spring lock coupling.
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A plastic indicator ring is used on the spring lock couplings of the A/C evaporator core to indicate, during vehicle assembly, that the coupling is
connected. Once the coupling is connected, the indicator ring is no longer necessary but will remain captive by the coupling near the cage opening.
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The indicator ring may also be used during service operations to indicate connection of the coupling.
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An A/C tube lock coupling clip may be used to secure the coupling but is not required.
TUBE-O FITTING
The condenser fittings are the tube-O type.
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The male and female portions of the peanut fitting are retained with a nut.
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An O-ring seal is installed around the tube on the male side of the fitting.
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Support the female fitting with a wrench to prevent twisting of the tubes when disconnecting.
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Use only the O-ring seal listed in the Ford Master Parts Catalog.
