Why does my heat only work on full blast?
Resistor module replacement Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. And when one or more of these resistors burn out, you’re usually left with only one heater blower motor speed—high. Remove the screws, and swap out the resistor module.
Is there a fuse that controls the heater?
A: Your car’s heater does indeed have a fuse. You can check to see if the heater fuse is shot by looking inside your fuse box. You’ll need your car’s dusty manual to find out where your fuse box is and which fuse is for the heater.
Is there a problem with my blower fan?
Blower fan intermittent, changes fan speed on its own. All fuses are good. Hello, this has become a common problem over the past several years. The first thing to note is proper understanding of the system controls. If you have dual climate control, when you set a temperature the fan motor should be fluctuating to reach this temperature.
Why does my blower only work on high speed?
If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode. To repair the problem, simply replace the resistor block.
What happens when the resistor on a blower motor burns out?
The resistor block contains three different high resistance coils. Think of these coils like a filament in a light bulb. The coil resistance causes them to heat up, thereby reducing the amount of voltage that can flow to the blower motor. When a resistor coil burns out, you lose that fan speed.
What to do if your car heater is blowing out cold air?
Run the engine until the fan kicks in. Once your fan has come on, look around the radiator for a bleed port or bleed screw. This is something that can be turned with a screwdriver. Once you turn it anti-clockwise, you should hear a hiss; this is the air being released. 4. Are the Heater or Heater Controls Broken?