MODEL IDENTIFICATION
Vehicle model can be identified by fifth character of Vehicle Identification Number (VIN), stamped on metal tab, on top left end of instrument panel, near windshield. See MODEL IDENTIFICATION table.
| Series (1) | Model |
|---|---|
| "C" | 2WD Pickup, Sierra |
| "G" | Van |
| "K" | 4WD Pickup, Sierra |
| "P" | Commercial Van & Motorhome Chassis |
| (1) Fifth character of VIN. | |
| (1) | Fifth character of VIN. |
MODEL IDENTIFICATION
With A/C
Electric cooling fan is an auxiliary cooling unit for the A/C condenser. On 7.4L "C" and "K" Series, cooling fan is controlled by A/C control module.
When predetermined temperature is reached, coolant temperature switch closes, causing the relay contacts to close. This allows battery voltage to the cooling fan motor. Coolant temperature switch is located on right cylinder head, above center of exhaust manifold. Relay is located in engine compartment, on left inner fender, near engine compartment firewall ("C" and "K" Series), or at center of firewall ("G" and "P" Series).
TROUBLE SHOOTING & TESTING
Note. For information on "C", "G", "K" and "P" Series (Scheme 1)and (Scheme 2). For more information on all vehicles, see SYSTEM/COMPONENT TESTING article in ENGINE PERFORMANCE section.
Scheme 1
Scheme 2
Cooling Fan Circuit Wiring Diagram ("C" & "K" Series - 7.4L). Scheme 3
See also:
• MODEL IDENTIFICATION