Quick Answer: Why does my car heater only work on high?

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.

Why does my car heater only work on number 4?

It is the blower motor resistor pack that is designed to cut the voltage to the blower motor to control the fan speed. The resistor pack is by-passed on setting #4, so the blower motor gets a full 12V, running as fast as it can. Typically, these are located in the duct path close to the blower fan.

Why doesn’t my car heater get very hot?

If the heater control valve is the culprit, the air coming into your vehicle won’t feel warm. The heater core may also leak coolant. The heater core is clogged from debris in the cooling system. If debris has caused a clog in the heater core, it will need to be replaced.

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Why does my air only work on high?

When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds, so the fan runs slower.

How much does it cost to replace a blower resistor?

The average cost for blower motor resistor replacement is between $108 and $137. Labor costs are estimated between $44 and $55 while parts are priced between $64 and $82. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.

How much does it cost to fix a blower motor in a car?

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The average cost for blower motor replacement is between $306 and $327. Labor costs are estimated between $68 and $86 while parts are priced between $238 and $241. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location.

Do Halfords fix car heaters?

Halfords supply a full range of car heater parts and car fan parts. … You can also use the Halfords free click and collect service.

What to check if heat is not working?

Check your power source—a tripped circuit breaker or blown fuse could be the reason for your furnace failure. Reset your breaker or replace the fuse to see if that restores heat. Check your filter—if it’s so dirty that your system is struggling to move air through it, your furnace could overheat and shut down.

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How do you know if your thermostat is bad in your car?

Symptoms of a Failing Car Thermostat

  1. The temperature gauge reads high and the engine overheats.
  2. The temperature changes erratically.
  3. The vehicle’s coolant leaks around the thermostat or under the vehicle.

How do I know if my heater core is clogged?

There are several telltale signs that you’re experiencing a heater core problem:

  1. You have little or no heat inside your car. …
  2. You smell coolant inside your vehicle. …
  3. Your windows fog up. …
  4. You see signs of a coolant leak under the dashboard. …
  5. Your coolant level is dropping, or your engine is running hot.

What are the signs of a bad blower motor resistor?

Symptoms of a Bad or Failing Heater Blower Motor Resistor

  • Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. …
  • Blower motor does not work on certain settings. …
  • No air from the vehicle’s vents.

Why does AC only work when car is moving?

Another reason why the air conditioner works only when your car is moving may be low freon levels. If your air conditioning system freon levels are below what is needed, it will not cool properly. As a result, it only cools when your car is moving as the car is then capable of pumping the freon with ease.

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