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905644 REV A 01/10/19, PG 24 OF 33
NOTE: Vintage Air Systems use 5/8” heater connections. On engines equipped with 3/4” hose nipples,
these will need to be removed and replaced with 5/8” nipples (not supplied). For water pumps with a
cast-in 3/4” heater outlet, a 3/4” x 5/8” reducer fitting in the heater hose (not supplied) or molded
hose (Vintage Air Part #099010) will need to be installed.
1.
2.
3.
4.
5.
Install the heater control valve support bracket onto the heater control valve using (4) #8 x 1/2” screws (See
Photo 1, below).
NOTE: Before mounting the heater control valve in the vehicle, ensure that the
wiring from the main harness and heater control valve can be connected easily without tension or
strain on the connection, or excessive pressure on the metal surfaces.
Route a piece of heater hose (not provided) from the lower heater core fitting to the water pump. Secure
using hose clamps. (See Photo 2, below).
Route a piece of heater hose (not provided) from the intake manifold to the heater control valve. Connect the
heater hose from the upper heater core fitting to the heater control valve. Secure using hose clamps (See
Figure 1 and Photo 3, below).
NOTE: Ensure proper flow direction through the heater control valve
(the flow direction follows the molded arrow on the valve).
Plug the heater control valve connector into the connector on the main wiring harness (See Photo 4, below).
NOTE: Secure the white wire from the heater control valve portion of the main harness to a
suitable chassis ground.
Install a #10 Adel clamp to secure the #8 A/C hose, and secure the heater hoses using tie wraps (See Photo
5, below).
NOTE: Use an OEM hole to mount the Adel clamp. If an OEM hole is not available, a new
hole will need to be drilled. Be sure all hoses are routed away from the fan, belts and pulleys.
Heater Control Valve Installation
Heater Control Valve
Support Bracket
648284
Heater Control
Valve
461171
(4) #8 x 1/2”
Screws
Photo 1
Heater
Hoses
From Heater Control
Valve to Heater Core
From Heater
Core to Water
Pump
From Intake Manifold
to Heater Control Valve
Hose
Clamps
Figure 1
NOTE: Flow Direction Follows Molded
Arrow on Valve.
Route Hose From Lower Heater
Core Fitting to Water Pump
Photo 2
Intake Manifold
Connection
Photo 3
Heater Control
Valve Connector
Photo 4
Secure White Wire
to Chassis Ground
Photo 5
Install a #10
Adel Clamp
Heater Control Harness Connector
Secure Hoses
with Tie Wraps
Summary of Contents for 564191
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