Engine Cooling Fan — Dodge Caravan II (1990-1995)

DESCRIPTION

All FWD cars and vans use electric motor-driven cooling system fans. Fan assembly includes a motor support, which depending on model may 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 (V6), IMPERIAL, NEW YORKER & FIFTH AVENUE

Cooling fan is turned on when either coolant temperature or A/C head pressure become excessive. 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.

Cooling fan turns on when the coolant temperature sensor signals the SBEC that coolant temperature has reached 210°F (99°C). Regardless of vehicle speed, fan will turn off when coolant temperature drops to 200°F (93°C). Fan will also 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 ).

EXCEPT DYNASTY (V6), IMPERIAL, NEW YORKER & FIFTH AVENUE

Fan will always operate when A/C compressor clutch is engaged. In addition, fan is turned on in accordance with coolant temperature. 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 fan control. Fan should not operate during cranking until engine starts. Fan should 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). Fan 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).

Fan will operate for 3 minutes when vehicle is stopped with engine idling, coolant temperature is 100-195°F (38-97°C) and ambient temperature is less than 60°F (16°C).

ELECTRIC FAN MOTOR

Disconnect electric fan motor. Observing correct polarity, connect a 12-volt battery to electric fan motor connector terminals. (Scheme 1) Replace electric fan motor if it fails to operate.

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

Scheme 1

Scheme 1: ELECTRIC FAN MOTOR

FAN RELAY & SBEC

CAUTION

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

Scheme 2

Scheme 3

Scheme 4

Scheme 5

With ignition on, check for voltage at Gray wire of radiator fan relay. Radiator fan relay may be located behind windshield washer bottle, in power distribution center, or in front of left strut tower. (Scheme 2)- (Scheme 4).
If battery voltage exists at Gray wire, go to next step. If battery voltage does not exist, check for open or short circuit in Gray wire.
Install jumper wire between Gray and Light Green wires of radiator fan relay. If fan operates, go to next step. If fan fails to operate, check for open or short circuit in Light Green wire between radiator fan relay and fan motor connector.
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. NOTE: Fault codes are obtained by attaching Diagnostic Readout Box II (DRB-II) to diagnostic connector located near battery. For additional information, see appropriate article in the ENGINE PERFORMANCE Section.
If fault code indicates 88-12-35-55 (RADIATOR FAN RELAY), turn ignition on. Check for battery voltage at proper wire color of radiator fan relay. See «TEST WIRE COLORS»(/dodge/caravan/ii-1990-1995/remont/cooling-fan/#engine-cooling-fan) table. If battery voltage exists, go to next step. If voltage is 0-1 volt, go to step 8). TEST WIRE COLORS Application Wire Color Dynasty (V6), Fifth Avenue, Imperial & New Yorker White All Others Dark Blue
With ignition off, disconnect 60-pin connector from SBEC. SBEC is located on left front corner of engine compartment.
Turn ignition on. Check for battery voltage at cavity No. 31 (Dark Blue/Pink) wire of connector. (Scheme 5) If battery voltage exists and female terminal is not damaged, replace the SBEC. If no voltage exists, repair open or short circuit 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/caravan/ii-1990-1995/remont/cooling-fan/#engine-cooling-fan) table. If battery voltage exists, replace the SBEC. If voltage reading is 0-1 volt, go to next step.
With ignition on, test for battery voltage at Dark Blue/Orange wire (Dynasty V6, Fifth Avenue, Imperial and New Yorker with V6 engine) or Dark Blue/Pink wire (all others), at radiator fan relay.
If battery voltage exists, replace radiator fan relay. If no voltage exists, repair open or short in Dark Blue/Orange or Dark Blue/Pink wire between radiator fan relay and SBEC. Turn ignition off, reconnect 60-pin connector to SBEC and test system.