Ac only works on high

If your air conditioner works on high, it is a very specific issue. It can mean that there is a problem with the blower motor, the control board, or the thermostat. However, we still do a full diagnostic check-up to ensure that all of the switches, wiring, and fuses could not be causing the same issue.

Why does my AC only work on high?

When the resistor fails, typically, the highest setting is the only option that still functions. This is because the air from the blower motor is bypassing the resistor, thus gaining the maximum amount of voltage, resulting in full power. In other cases, there could be an issue with your AC module or the fan switch.

What causes a blower motor to 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. The resistor module is easy and inexpensive to replace.

How much does it cost to replace a blower motor resistor?

between $109 and $140

The average cost for blower motor resistor replacement is between $109 and $140. Labor costs are estimated between $44 and $55 while parts are priced between $65 and $84. 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.

Why does my AC not go below 70?

A clogged filter is often at the root of many performance issues. Blocked condenser: The condenser (the outdoor unit) of an AC needs to be clear on all sides so it can exhaust heat. If the condenser is blocked or excessively dirty, the air conditioner will not be able to cool down its refrigerant low enough.

How do you fix a blower motor resistor?

How to Replace a Blower Motor Resistor

  1. Step 1: Remove the glove box door, if necessary. …
  2. Step 2: Disconnect the wiring harness and remove screws. …
  3. Step 3: Remove and replace the blower motor resistor. …
  4. Step 4: Tighten screws and reattach wiring harness. …
  5. Step 5: Reinstall the glove box door.

How do you test the blower motor resistor?

Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.

How do I know if I need a blower motor or a resistor?

Here are some of the warning signs of a bad heater blower motor resistor: Fan does not work at all, so no air comes out of the vents. Fan only works on some speeds and not others. Fan only works on the highest speed.

Where is the blower resistor located?

The heater blower motor resistor is often found beneath the dashboard. It is located in the heater and air conditioning compartment. It’s connected to the air conditioning system, where it can adjust the speed of the blower motor fan. It can also be found behind the glove box of some vehicles.

How much does it cost to replace blower motor?

Replacing a blower motor costs $450 on average with a typical range of $250 to $800. With a warranty, you might pay as little as $150 for labor alone. For high-end models, like those with large motors or access issues, you might pay as much as $2,000.

Why is my AC stuck at 77?

A dirty air filter

Your air filter is designed to trap contaminants in the air before it gets pulled into the AC system. But over time that means that your filter gets dirty and clogged. And if a dirty filter isn’t replaced, it can seriously limit your AC’s cooling power.

Why won’t my AC go below 77?

Low Air Flow

If the airflow within the unit is low and the room or home doesn’t seem to dip below 77 degrees Fahrenheit, the filter could be to blame. A clogged or dirty filter not only prevents the unit from efficiently taking in air through the intake grille, it also runs up the electric bill.

Why is my AC not lowering temperature?

Condenser Unit is Blocked

If your air conditioner is running, but not lowering temperatures inside, one issue could be a blocked or clogged condenser coil. When operating correctly, the condenser fan draws air into the outdoor unit through the condenser coil to pull heat energy out of your home.

Why is AC cooling low?

Dirty air filters and condenser coils negatively impact the ability of an AC to cool a room. The dirt and debris that accumulates on the filter and coils trap heat and restrict air flow. This trapped heat causes the unit to overheat and underperform.

Why is my AC not keeping up with thermostat?

If the temperature sensors are miscalibrated, the thermostat may be shutting the compressor off prematurely—and that means you won’t get the cooling you need. There are many other possibilities, however, including issues with the compressor, the evaporator coil, the blower fan, or even the ductwork.

Should I turn my AC off if it’s not cooling?

So, if your air conditioner isn’t cooling, and you suspect a refrigerant leak, or if you’ve checked the air filter and thermostat to no avail, yes, you should shut your air conditioner off and call us right away.

Why is my house so hot even with AC on?

Your AC Is the Wrong Size

It makes sense that if your air conditioner’s cooling capacity isn’t enough for the space it needs to cool, you’d experience discomfort. So if you’re cranking up the AC and still feeling warm and sticky, the AC might be too small to properly cool the size of your home.

How do you know if your AC needs freon?

Signs your air conditioner needs freon

  1. Air conditioner is always running but it doesn’t cool your home.
  2. Vents are blowing warm air.
  3. Electric bills are higher than before.
  4. There is a buildup of ice on refrigerant line.
  5. A hissing or bubbling sound from the refrigerant line.