Engine Cooling Fan — Dodge Shadow I (1986-1994)

DESCRIPTION

All FWD models and Dakota 2.5L use electric motor driven cooling system fans. Fan assembly includes a motor support which may (depending on model) include a shroud. Fan assembly is fastened to radiator by clips or bolts.

Note. Fan assembly cannot be repaired. If fan is warped, cracked, or otherwise damaged, the entire fan assembly must be replaced.

Dynasty, Imperial, New Yorker & Fifth Avenue W/V6

Fan is turned on by the temperature of coolant which is sensed by coolant temperature sensor. Fan may also be turned on in accordance with A/C head pressure. A message is sent to the Single Board Engine Control (SBEC) under these conditions and the SBEC turns on the fan through a radiator fan relay.

Fan will operate when coolant temperature reaches 210°F (99°C) and turn off at 200°F (93°C) regardless of engine speed. Fan will operate when A/C head pressure reaches 220 psi (15.5 kg/cm 2 ) and turn off when pressure reaches 160 psi (11.2 kg/cm 2 ).

All Others

Fan will always operate when A/C compressor clutch is engaged. In addition, fan is turned on by temperature of coolant which is sensed by coolant temperature sensor. The coolant temperature sensor sends a message to the Single Board Engine Control (SBEC). The SBEC turns on the fan through a radiator fan relay.

Switching through the SBEC provides for fan control. Fan should not operate during cranking until engine starts and always operate when A/C clutch is engaged.

On non-A/C equipped vehicles or with A/C off, fan will operate when vehicle speed exceeds 40 MPH only if coolant temperature reaches 230°F (110°C), and will turn off when temperature drops to 220°F (104°C).

At speeds less than 40 MPH, fan will operate when coolant temperature reaches 210°F (99°C) and turn off at 200°F (93°C).

On all models except Dakota (2.5L) models, fan will operate to prevent steaming water vapor from outside of radiator. Fan will operate for 3 minutes when vehicle is stopped with engine idling, coolant temperature is within 100-195°F (38-97°C) and ambient temperature is below 60°F (16°C).

TROUBLE SHOOTING ELECTRIC FAN MOTOR

Note. At idle with A/C off, temperature gauge will rise slowly to about 5/8 gauge travel, fan will come on and gauge will quickly drop to about 1/2 gauge travel. This is normal.

To check electric fan motor, disconnect fan motor wire connector. Observing correct polarity, connect a 12-volt battery source and ground to fan motor connector. Connect positive side to the male side of connector and negative side to female side of connector. Replace fan if it fails to operate.

Note. If motor is noticeably overheated, system voltage may be too high. Check charging system.

TROUBLE SHOOTING FAN RELAY & SBEC

CAUTION

Check electric fan motor operation prior to checking fan relay and SBEC. Ensure SBEC is securely grounded.

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

With ignition on, check for voltage at Gray wire at radiator fan relay. Radiator fan relay may be located behind windshield washer bottle, at rear of power distribution center or located in front of left strut tower. (Scheme 1)- (Scheme 5).
If battery voltage exists, proceed to step 3). If battery voltage does not exist, check for open or short in Gray wire circuit.
Install jumper wire between the Gray and Light Green wires on radiator fan relay. If fan operates, proceed to step 4). If fan fails to operate, check for open or short in the Light Green wire between radiator fan relay and the fan motor connector.
If fan operates, warm engine to normal operating temperature. Check for loose connections on fan motor and at fan motor relay. If all connections are okay, fault codes must be checked.
Fault codes can be checked by using diagnostic connector located at right rear corner of engine compartment on the firewall near MAP sensor on Dakota (2.5L) models or in front of left shock tower on all others. Refer to G - TESTS W/ CODES article in the ENGINE PERFORMANCE Section for complete instructions for connecting diagnostic tester and checking for fault codes.
If fault code indicates "RADIATOR FAN RELAY," turn ignition on and check for battery voltage at proper wire color of radiator fan relay. See «TEST WIRE COLORS»(/dodge/shadow/i-1986-1994/remont/cooling-fan/#engine-cooling-fan) table. If battery voltage exists, proceed to step 7). If voltage is between 0 and 1 volt, proceed to step 8).
With ignition off, disconnect 60-pin connector from SBEC. The SBEC is located on right front corner of engine compartment on Dakota (2.5L) and on left front corner of engine compartment on all others. Turn ignition on. Check for battery voltage at cavity No. 31 (Dark Blue/Pink) wire of connector. (Scheme 6) If battery voltage exists and female terminal is not damaged, replace the SBEC. If no voltage exists, repair open or short in Dark Blue/Pink wire from radiator fan relay to the SBEC.
With ignition off, disconnect 60-pin connector from SBEC. Turn ignition on. Check for battery voltage at proper wire color of radiator fan relay. See «TEST WIRE COLORS»(/dodge/shadow/i-1986-1994/remont/cooling-fan/#engine-cooling-fan) table. If battery voltage exists, replace the SBEC. If voltage reading is between 0 and 1 volt, proceed to step 9).
With ignition on, test for battery voltage at Dark Blue/Pink wire at radiator fan relay. If battery voltage exists, replace radiator fan relay. If no voltage exists, repair open or short in Dark Blue/Pink wire between radiator fan relay and SBEC. Turn ignition off, reconnect 60-pin connector to SBEC and test system. TEST WIRE COLORS Application Wire Color Daytona & LeBaron Coupe/Convertible Dark Blue/White Dynasty, Fifth Avenue, Imperial & New Yorker White All Others Dark Blue