Trouble Shooting
NOTE:
This article contains test charts which are part of General Motors Computerized Engine Controls. Only those charts required to test electric cooling fans are included. Other diagnostic information may be referenced while performing electric cooling fan diagnosis. For complete information on General Motors Computerized Engine Control systems, see appropriate article in the ENGINE PERFORMANCE section.
NOTE:
Some RWD trucks and vans are equipped with an auxiliary electric cooling fan. The auxiliary electric cooling fan is not controlled by Engine Control Module (ECM) or Powertrain Control Module (PCM).
Trouble shoot cooling fan using appropriate C-12 charts provided. See COOLING FAN CHARTS . For cooling fan relay location, see COOLING FAN RELAY LOCATION table.
COOLING FAN RELAY LOCATION
| Application | Location | ||
|---|---|---|---|
| "U" Series | (1) In Right Front Corner Of Engine Compartment, Next To Fuel Evaporation Canister | ||
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