← Ranger
Autopapyrus · Hino Ranger (1997)
https://autopapyrus.com/guides/hino/ranger/heater-fan-speed-resistor-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Hino Ranger (1997): Heater Fan Speed Resistor Replacement

The resistor lowers the voltage to the heater blower motor in steps. When it burns out, the low speeds usually stop working while the fan still works on the highest speed. If none of the speeds work, first check the fuse, the switch and the motor itself. The exact procedure for this model is not documented in public service materials, so what follows is the general principle that applies to trucks of this type.

Difficulty: Easy Time: 30-60 minutes Steps: 10 Tools: Screwdriver set (Phillips, flat), 8-10 mm sockets and ratchet, multimeter, flashlight, contact cleaner

Part

  • 🔩 Heater blower resistor (resistor block) for 1990s Hino Ranger. Before buying, remove the old resistor and compare the number of speed steps, the housing shape and the connector. For this generation of Ranger, the exact part number is not confirmed in public sources, so do not rely on a number from online listings without checking it against the old part's appearance

Step by step

10 steps
  1. Shut off the engine and disconnect the ground from the battery. The Ranger usually has two 24 V batteries, so disconnect the negative lead of the whole circuit.
  2. Check the heater blower fuse and relay. If the fuse has blown, find the cause: a seized motor or a short in the wiring. Otherwise the new resistor will fail again.
  3. Locate the resistor. It is usually mounted on the heater housing or near the blower motor under the dashboard, on the passenger side. It sits in the air duct so that airflow cools it. You may need to remove the lower dash trim or the glove box for access.
  4. Inspect the connector. Melted terminals, dark discoloration or a burnt smell mean you need to replace the connector housing or repair the terminals. Otherwise the new resistor will overheat.
  5. Disconnect the connector, remove the resistor's mounting fasteners (usually two screws or bolts) and pull it out of the housing.
  6. Test the old resistor with a multimeter in ohmmeter mode. Between the common terminal and each of the other terminals, the resistance should increase as the speed decreases. An open circuit on any step confirms the fault. If there is resistance on all steps, look for the cause in the switch or the wiring.
  7. Clean the mounting area of dust and corrosion. Check that the blower motor turns freely without binding. Excess motor current kills new resistors.
  8. Install the new resistor and tighten the fasteners moderately, without overtightening the plastic housing and without distorting the seal. Connect the connector until it clicks.
  9. Reconnect the battery, turn the ignition on and check all fan speeds. Run the fan on the highest speed for 5-10 minutes, then check whether the connector is getting hot.
  10. Reinstall the panels you removed.

Common mistakes and warnings

  • The resistor gets very hot in operation, so do not touch it right after the heater has been running when you check it. Do not replace it with a jumper or a wire connected directly: this will burn out the switch and may cause a wiring fire. If the fuse blows again after the replacement, stop using the system and take the truck to an auto electrician.