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Autopapyrus · Great Wall Hover H5 2.0 Turbo (2014)
https://autopapyrus.com/guides/great-wall/hover/cooling-fan-control-system-diagnosis-and-repair/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Great Wall Hover H5 2.0 Turbo (2014): Cooling Fan Control System Diagnosis and Repair

On the Great Wall Hover H5, the cooling fan is controlled by the ECU through a two-speed system with a resistor and two relays. Typical faults are failure of the low-speed resistor and oxidized contacts, and less often a faulty temperature sensor. The coolant temperature sensor (part number SMW250119) sends data to the ECU, which turns on low speed at 95°C (through the resistor) and high speed at 101°C (directly). The procedure covers diagnosis of the entire control circuit: the sensor, relays, resistor and wiring.

Difficulty: Medium Time: 1-2 hours Steps: 10 Tools: multimeter, wrench set (10 mm and 13 mm sockets), screwdrivers, pliers, coolant drain pan (~1 L (1.1 qt))

Part

  • 🔩 coolant temperature sensor SMW250119, fan low-speed resistor (if faulty), 40A and 70A relays, coolant (~1 L (1.1 qt) for topping off)

Step by step

10 steps
  1. Connect a diagnostic scan tool to the OBD-II port (under the steering column on the left) and read the trouble codes. Possible codes are P0115-P0118 (coolant temperature sensor) and P0480-P0483 (fan control circuit). Note the temperature reading at idle. The normal range is 80-90°C after warm-up.
  2. Turn off the engine and open the hood. Locate the coolant temperature sensor. It is usually in the upper part of the cylinder head, on the right side of the engine, with a two-pin connector. Disconnect the sensor connector.
  3. With a multimeter, measure the sensor resistance on a cold engine (~20°C). The normal range is 2000-3000 ohms. On a warmed-up engine (~90°C) it should be 200-300 ohms. If the values are out of range or the sensor reads infinite resistance, replace the sensor.
  4. To replace the sensor, partially drain the coolant from the radiator (open the drain valve at the bottom of the radiator and place a pan underneath) until the level is below the sensor, usually 1-1.5 L (1.1-1.6 qt). Unscrew the sensor with a 19 mm or 22 mm wrench (depending on the version) and clean the mounting seat of old sealant.
  5. Thread the new SMW250119 sensor in by hand until it stops, then tighten it another half turn with a wrench (tightening torque 15-25 N·m (11-18 lb-ft); check the manufacturer's specification for the exact value). Reconnect the connector and top off the coolant to the MAX level in the expansion tank.
  6. Check the fan relays and resistor. Open the relay box under the hood (usually on the left near the battery or on the firewall). Find the two fan relays (40A for low speed, 70A for high speed) using the diagram on the box cover or in the manual.
  7. Remove the low-speed relay (40A). With the ignition on, bridge terminals 30 and 87 in the relay socket with a jumper wire or a screwdriver. The fan should start running at low speed. If it does not, the problem is in the resistor or the fan motor. Repeat for the high-speed relay (70A). The fan should spin faster.
  8. If low speed does not turn on, check the resistor. The resistor is usually mounted on the fan shroud or near the radiator. It is a black block with two wires. Disconnect the resistor connector and measure the resistance between the terminals with a multimeter. The normal range is 20-30 ohms. If you read ~1500-2000 ohms or infinite resistance, the resistor is faulty (a typical failure is oxidation and burning of the wire crimp contacts).
  9. Inspect the resistor contacts for oxidation, burn marks and a poor crimp. As a temporary fix, you can clean the contacts and squeeze the crimp with pliers, but the reliable solution is to replace the entire resistor. Confirm the exact part number for the H5 2.0 Turbo with your supplier using the VIN, or use a universal 20-30 ohm, 10-15 W resistor.
  10. Reassemble in reverse order, start the engine and let it warm up to operating temperature with the scan tool connected. Low speed should turn on at 94-96°C and high speed at 101-103°C. Check for coolant leaks around the sensor.

Common mistakes and warnings

  • Do not drive the vehicle with a non-working fan. Engine overheating warps the cylinder head and blows the head gasket. When replacing the temperature sensor, use only the original SMW250119 or a proven equivalent. Cheap counterfeit sensors give false readings and cause fan control malfunctions. If the low-speed resistor fails repeatedly, check the fan motor ground connection and make sure there is no short circuit in the motor windings.