1646 Radiator Hose Kit

Hose kit for the stock FordĀ® radiator. The kit is designed for the newer-style thermostat housing that points toward the driver side of the truck (DCS Part #1657) and the newer-style lower water neck that points toward the passenger side. Some trimming of hoses is required.

Kit components

DCS partQtyDescription
17951Lower radiator hose
179812" bent tube (upper)
218812" to 1.75" reducer
21771T-fitting
2614, 20131 eachHose splice fittings
2474, 2615, 13131 eachHoses (heater and 1" fill-tank hose)
13421Hose clamp, SAE #36
26411Hose clamp, SAE #28
26424Hose clamp, SAE #32
13163Hose clamp, SAE #16
22125Hose clamp, SAE #12

1646 radiator hose kit contents with part numbers

Upper radiator hose

  1. Install the 2" to 1.75" reducer on the upper water neck.
  2. Install the 2" bent tube between the reducer and the stock factory hose.
  3. Trim the stock factory hose to fit between the radiator and the bent tube.

Upper radiator hose routing: reducer, bent tube, trimmed factory hose

Heater return fitting: This fitting is for the heater return hose. Replace it with a ¾" pipe elbow and hose barb, or cap the unused horizontal opening.

Heater return hose fitting, circled

Lower radiator hose

  1. Start with the factory 6.4L lower radiator hose. Separate it at the factory connection and discard the radiator side of the OEM connection; it is not used.
    Factory 6.4L lower radiator hose and its factory connection
  2. Cut the hose at the indicated line.
    Cut line on the factory lower hose
  3. Discard the unused portion and keep the section shown.
    Section of factory hose to keep
  4. Install the T-fitting on the remaining OEM portion.
    T-fitting on the remaining OEM hose
  5. Mock up the assembly, then cut the supplied hose (DCS Part #1795) to fit.
    Cut line on hose 1795
  6. Assemble the lower radiator hose.
    Lower radiator hose assembly: hose 1795, T-fitting, OEM section
  7. Attach the 1" hose to the T-fitting and route it to the radiator fill tank.
    1-inch hose clamped to the T-fitting

Heater hoses

Heater hoses and splice fitting