For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
The auxiliary fan motor is mounted on the right side of the radiator/condenser assembly. The fans run at low speed (series configuration) when the A/C is operating and the engine coolant temperature (ECT) is below 83°C (181°F). The fans run at high speed (parallel configuration) when the ECT is above 93°C (199°F).

A short to ground in the ground circuit of the A/C fan no. 1 and 2 relays will cause both fans to be inoperative once the ECT reaches 93°C (199°F). This table assumes that the main (left side) fan motor is functioning normally.

The following are symptoms and possible causes.

• | Both fans inoperative:

- | Open in the supply voltage circuit to the fan no. 1 and the engine main relays in fuse and relay block 1

- | High resistance or poor connection in fuse and relay block 1

- | Faulty engine main relay

- | Short to ground in the fan no. 1 or the fan no. 2 coil ground circuit

- | Engine coolant temperature (ECT) sensor or powertrain control module (PCM) malfunction

• | Main fan inoperative:

- | Faulty main fan motor

- | Faulty fan no. 1 relay

- | Open in main fan circuit

• | Auxiliary fan inoperative:

- | Faulty auxiliary fan motor

- | Faulty fan no. 2 relay

- | Open in auxiliary fan circuit

• | Both fans inoperative in low speed:

- | Faulty fan no. 2 relay

- | Faulty fan no. 3 relay

- | Open in series portion of fan circuit

1 | Did you perform the HVAC System Check? | Go to Step 2 | Go to HVAC System Check
2 |

1. Run the engine until operating temperature is reached and the thermostat opens.
2. Stop the engine.
3. Disconnect the auxiliary fan motor connector.
4. Connect a test lamp across the auxiliary fan motor connector.
5. Start the engine.

Does the test lamp light?

Go to Step 3

Go to Step 4

3 | Replace the auxiliary fan motor. Refer to Engine Cooling Fan Replacement in Engine Cooling. Is the repair complete? | Go to HVAC System Check | --
4 | Test for battery voltage at the auxiliary fan motor connector terminal 2. Is battery voltage present? | Go to Step 8 | Go to Step 5
5 | Inspect the CDS fuse in fuse and relay block 2 for an open. Is the fuse open ? | Go to Step 6 | Go to Step 7
6 | Repair the short to ground in the BLU/RED wire between the CDS fuse and the auxiliary fan motor connector terminal 2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to HVAC System Check | --
7 | Repair the open in the BLU wire between the CDS fuse and fuse and relay block 1 OR in the BLU/RED wire between the CDS fuse and the auxiliary fan motor connector terminal 2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to HVAC System Check | --
8 |

1. Remove the A/C fan no. 2 relay from fuse and relay block 2.
2. Test for an open between the auxiliary fan motor connector terminal 1 and the A/C fan no. 2 relay cavity 3.
3. Test for an open between the A/C fan no. 2 relay cavity 4 and G104. Refer to

   #### Fuse and Relay Block 1

   (1) | ST Relay
   (2) | HEAD Relay
   (3) | EFI or F-HTR Relay
   (4) | Fuse Puller
   (5) | ENGINE MAIN Relay
   (6) | HORN Relay
   (7) | AM1 Fuse 50A
   (8) | RDI Fuse 30A
   (9) | FAN Relay
   (10) | ALT-S Fuse 7.5A
   (11) | Empty
   (12) | Not Used
   (13) | HORN Fuse 20A
   (14) | Not Used
   (15) | Not Used
   (16) | AM2 Fuse 30A
   (17) | HAZARD Fuse 20A
   (18) | DOME Fuse 20A
   (19) | ALT Fuse 100A
   (20) | ABS Fuse 50A
   (21) | MAIN Fuse 50A
   (22) | Not Used
   (23) | Fuse and Relay Block 1

   in Wiring Systems.

Is an open present?

Go to Step 10

Go to Step 9

9 | Replace the fan no. 2 relay. Refer to Condenser Fan Relay Replacement . Is the repair complete? | Go to HVAC System Check | --
10 | Repair the open. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to HVAC System Check | --