Repair Procedures

This repair procedure involves the routing of the heater supply hose so it contacts the choke housing. The heat from this hose reduces the tendency of the choke to close before the engine cools off. It is, therefore, very important the heater hose be in direct contact with the choke housing.

"M" Body Passenger Cars and D-W Series Trucks Without Silicone Heater Hoses and With Air Conditioning

1. Remove and discard the supply heater hoses and the water control valve. This is the hose that connects the intake manifold to the heater core.

2. Remove the return heater hose from the heater core at the cowl and install it on the opposite nipple of the heater core.

3. Remove and discard 33 inches off the straight end of the preformed hose, PN 4361146.

FIGURE 2:

4. Clamp water valve, PN 4085474, onto the straight end of heater hose, PN 4361146, which was cut off in Step 3 above. This water valve has an embossed arrow on it to indicate water flow. This arrow must point toward the heater core or precise control of water flow to the heater will be impossible. Proper orientation of this valve is illustrated in Figure 2. Install heater hose, PN 3849197, on the other side of the water valve.

FIGURE 1:

5. Attach supply heater hose bracket, PN 4307576, to the intake manifold boss using enclosed screw, PN 3730000, as illustrated in Figure 1.

FIGURE 3:

6. Install the 90~ bend of the supply heater hose and valve assembly onto the nipple on intake manifold. Route the supply hose past the carburetor choke housing and install the straight end of the hose onto the heater core inlet nipple. Install heater hose onto bracket and clamp securely in place (see Figure 3).

FIGURE 6:

7. Attach Authorization Modification Label, PN 4275086, as illustrated in Figure 6.
"M" Body Police With Silicone Heater Hoses

1. Follow the same installation procedure as on "M" body passenger car except silicone heater hose, PN 3849564, must be substituted for passenger car hose, PN 4361146. Silicone heater hose, PN 3849472, must be substituted for passenger car heater hose, PN 3849197.

FIGURE 6:

2. Attach Authorization Modification Label, PN 4274086, as illustrated in Figure 6.
D and W Model Trucks Without Air Conditioning

1. Remove and discard the supply heater hose that connects the intake manifold to the heater core.

FIGURE 1:

2. Attach heater hose bracket to intake manifold boss using screw, PN 3730000, as illustrated in Figure 1.

FIGURE 5:

3. Install 90~ bend of heater supply hose, PN 4361146, onto the intake manifold nipple. Route this hose post carburetor choke housing and install straight end of hose on the heater core nipple. Install hose into bracket and clump hose securely in place (see Figure 5).

FIGURE 6:

4. Attach Authorization Modification Label, PN 4274086, as illustrated in Figure 6.
"B" Model Van With and Without Air Conditioning

1. Remove and discard supply heater hose that connects the intake manifold to the heater core or to the water valve, if the vehicle is air conditioning equipped.

FIGURE 1:

2. Attach heater hose bracket, PN 4307576, to intake manifold boss using screw, PN 3730000, as illustrated in Figure 1.
3. Install 90~ end of supply heater hose, PN 4361142, onto the intake manifold nipple. Route this heater supply hose post the carburetor choke housing and install the straight end on the heater core or on the water valve, if the vehicle has air conditioning. This hose must be cut to length as required. Install this heater supply hose into the hose bracket previously attached to the intake manifold.

FIGURE 4:

4. Using tie wraps, PN 6015756, secure supply heater hose to automatic transmission dip stick tube. Use caution as not to deform dip stick tube, as this will make transmission fluid level checks difficult or impossible. Using tie wraps, tie the supply and return heater hoses together as illustrated in Figure 4.

FIGURE 6:

5. Attach Authorization Modification Label, PN 4275086, as illustrated in Figure 6.
POLICY: Reimbursable within the provisions of the warranty


TIME ALLOWANCE:
Labor Operation No. 14-30-56-96
Premature Choke Closing
"B" Van 0.7 Hrs.
D-W Truck and "M" Body Passenger Car 0.5 Hrs.

14-30-56-97 Optional Equipment Air Conditioning
"B" Van 0.3 Hrs.
D-W Truck and "M" Body Passenger Car 0.4 Hrs.


FAILURE CODE: AM - Authorized Modification