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905701 REV B 09/18/18, PG 21 OF 34
Heater Hose
& Heater Control Valve Installation
1.
2.
3.
4.
5.
6.
Install the heater control valve support bracket onto the heater control valve using (4) #8 x 1/2" screws (See
Photos 1 & 2, below)
Plug the heater control valve connector into the main wiring harness (See Photo 3, below).
Attach a 14” length of 5/8" heater hose to the heater control valve (See Photo 4, below), and attach the
other end to the upper heater hardline on the evaporator unit. Secure both ends with hose clamps.
Secure the heater control valve assembly onto the first OEM hole closest to the hood hinge using a 1/4-20 x
1/2" hex bolt and a 9/32" washer (See Photo 5, below).
Route the other end of the heater control valve heater hose to the intake coolant port (See Figure 2, below).
Secure it with a hose clamp.
Route a length of heater hose to the lower heater hardline on the evaporator unit. Route the other end to the
water pump coolant port (See Figure 2, below). Secure both ends with hose clamps (not supplied).
NOTE: When installing the heater control valve, make sure the flow arrow is facing toward the
evaporator unit.
Photo 1
Photo 2
Photo 3
Photo 4
Photo 5
Flow Arrow
Heater Control
Valve
(4) #8 x 1/2"
Screws
Heater Control
Valve Support Bracket
648284
Plug Heater Control Valve
Connector into Main Wiring
Harness
1/4-20 x 1/2"
Hex Bolt
and 9/32"
Washer
Secure with
Hose Clamp
Secure with
Hose Clamp
Attach 14” Length of
Heater Hose
onto Heater Control Valve
Figure 2
From Heater Core
to Water Pump
Heater
Hoses
Hose
Clamps
From Heater
Control Valve
to Heater Core
From Intake
Manifold to
Heater Control
Valve
NOTE: Flow Direction Follows
Molded Arrow on Valve.
