An air conditioner using only one blowing speed is not an unusual problem on a 1997 Honda CRV. A blower motor transistor regulates the speeds. The blower motor only works on high speed because it is bypassing the transistor when it is on high. If the blower motor were connected directly to the battery, it would run at 100 percent all the time. The blower motor transistor provides different resistances to current flow to the blower dependent on the location of the panel fan speed switch. Unfortunately, resistance creates heat the same as with headlights, resulting in burn outs.
Instructions
- 1
Empty the glove box. Push in on both sides next to the rubber stops so they pass the dash, then lower the glove box. Locate the transistor straight back behind the glove box. It is located in a vertical position next to the fan motor and has a vertically mounted electrical connector. The transistor is held in with two Phillips screws.
2Press in on the locking tab on the connector and pull it out. Check to make sure the transistor is getting power. Place the voltmeter on the 20-volt DC scale. Connect the black voltmeter lead to a good ground. Turn on the ignition key and probe the connector terminals for power. If 12 to 12.75 volts are present, proceed to the next step. If no voltage is present, check the wiring between the connector and the control panel for an open.
3Use the Phillips-head screwdriver to remove the two screws. Lift the transistor out of the housing.
4Install the new transistor and screws. Plug the electrical connector into the transistor. Push in on the sides of the glove box next to the stoppers to move them behind the dash. Close the glove compartment.
