MODEL IDENTIFICATION
Vehicle model can be identified by fifth character of Vehicle Identification Number (VIN), stamped on metal pad on top of left end of instrument panel, near windshield. See MODEL IDENTIFICATION table.
| Series (1) | Model |
|---|---|
| "C" | 2WD Pickup, Sierra |
| "G" | (2) Van |
| "K" | 4WD Pickup, Sierra |
| "P" | Commercial Van |
| (1) Vehicle series is fifth character of VIN. (2) Includes Rally Van and Vandura. | |
| (1) | Vehicle series is fifth character of VIN. |
| (2) | Includes Rally Van and Vandura. |
MODEL IDENTIFICATION
| Application | Engine |
|---|---|
| "C", "G", "K" & "P" Series | All with A/C |
ELECTRIC COOLING FAN APPLICATION
DESCRIPTION
On "C", "G", "K" and "P" Series, electric cooling fan is auxiliary cooling unit for A/C condenser.
"C", "G", "K" & "P" Series
Coolant temperature switch closes when predetermined temperature is reached. Relay contacts will close, completing circuit to fan motor.
Switch is located on right cylinder head, above center of exhaust manifold. On "G" and "P" Seireis, relay is located in engine compartment on center of firewall. On "C" and "K" Series, relay is mounted to left inner fender, near engine compartment firewall.
TROUBLE SHOOTING & TESTING
Note. For more information on electric cooling fan trouble shooting and testing, proceed to SYSTEM/COMPONENT TESTS - GASOLINE or SYSTEM/COMPONENT TESTS - 6.5L DIESEL article in ENGINE PERFORMANCE section
Scheme 1
Cooling Fan Relay (Removal & Installation)
- Disconnect negative battery cable.
- Disconnect wiring harness connector. (Scheme 2)
- Remove the relay from the inner fender.
- To install, reverse removal procedure.
Coolant Temperature Sensor (Removal & Installation)
- Disconnect negative battery cable.
- Disconnect wiring harness connector. (Scheme 2)
- Using socket, remove coolant temperature sensor. (Scheme 2)
- To install, reverse removal procedure. Tighten sensor to 17 ft. lbs (23 N.m). Add necessary coolant to fill system.
Auxiliary Coolant Fan (Removal & Installation)
Note. A removal & installation procedure is not provided by manufacturer. (Scheme 2)
Scheme 2
Coolant Fan Relay (Removal & Installation)
- Disconnect negative battery cable.
- Disconnect wiring harness connector. (Scheme 3)
- Remove relay retaining screws and remove relay from cowl panel. (Scheme 3)
- To install, reverse removal procedure.
- Disconnect negative battery cable.
- Disconnect wiring harness connector. (Scheme 3)
- Using socket, remove coolant temperature sensor. (Scheme 3)
- To install, reverse removal procedure. Tighten sensor to 17 ft. lbs (23 N.m). Add necessary coolant to fill system.
- Disconnect negative battery cable.
- Remove the grille assembly.
- Disconnect wiring harness connector. (Scheme 3)
- Remove the bolts and nuts for the auxiliary fan assembly, and remove fan.
- To install, reverse removal procedure. Tighten nuts to 115 INCH lbs. (13 N.m). Tighten bolts to 42 INCH lbs. (4.7 N.m).
