Service Procedure - C/K Trucks:

Figure 2A:

Figure 2B:

1. Disconnect the negative battery cable.

2. Remove instrument panel glove box compartment.

3. Using a 1/8 inch drill bit and service high blower relay 14036273 as a guide, drill two 1/4 inch deep holes into the blower motor case between the blower motor and the resistor block. See Figures 2A and 2B for approximate relay location (S/T shown, C/ K typical). Tape should be used to mark off 1/4 inch on the drill bit to avoid drilling too deeply and damaging any internal blower motor components.

4. Cut a piece of red 14 gauge wire approximately 20" long. Strip each end of the wire and crimp a female "quick connect straight" terminal on one end and p"ring tongue" terminal on the other end.

5. Cut one piece of black 14 gauge wire approximately 5" long and attach connectors to the wire in the same fashion as given in step 4.

6. Disconnect the orange electrical lead from the resistor block. Cut the orange lead to the blower motor where it enters the female "quick connect straight terminal that was just removed from the resistor block. Strip the end and attach a new female quick "connect straight" terminal to it and connect to terminal B the new high blower relay connector.

7. Cut one piece of brown 14 gauge electrical wire to approximately 4" long. Strip both ends of the wire and crimp a female "quick connect straight" terminal to each end.

Figure 1:

8. Make the following connections (see Figure 1).

^ Red wire to terminal E of high blower motor relay connector and to the junction block connection located on the cowl.

^ Black wire to blower motor case mounting bolt for chassis ground. Choose the nearest bolt and scrape lightly around the bolt hole to assure a good ground.

^ Remaining end of black wire to terminal A of high blower motor relay connector

^ Brown wire to terminal D high blower relay connector and terminal 52 of resistor block.

^ Remaining orange wire (ignition lead) to terminal C of high blower relay connector.

9. Firmly install the high blower connector to the high blower motor relay.

10. Bolt the high blower motor relay to the blower motor case using two 5/8 inch long (size 14) hex head sheet metal screws through the pre-drilled holes.
11. Attach negative battery cable.

12. Verify that the blower motor operates properly. If the blower motor does not function properly check all connections, and ground for poor fit or interference.

13. Using Tech 1, clear any codes in the RWAL memory and test drive the vehicle under the conditions outlined above to assure the false code 7 does not set.