OMG! Why Does My Car Ac Only Work on High Speed

Contents

You go to turn on your car’s AC and realized you have only one speed, and that’s the high speed. That leaves you puzzled and the question you ask yourself is why does my car AC only work on high?

This can be so annoying only hearing that fan blow it’s air all over you when it is not needed.

You don’t pay it too much attention because it’s summer and you enjoy the convenience of the burst of cool air. Winter rolls around, and you quickly realize that hot heat in your face is unbearable.

I did this too, so I know first hand. Before you head over to the repair shop this easy to understand article will give you a breath of fresh air, NO PUN INTENDED! Into why your car AC only work on high speed.

Possible Causes

Blower motor resistor

Main Ac switch

Electrical short

what is a blower motor resistor?

Blower motor resistors are used to control the fan speed of automotive blowers motor. The fan speed can be changed either by switching the blower resistor resistance mechanically, or by using the main AC switch, and also electronically by the air conditioning system.

How a blower motor resistor work

The change in resistance then limits the current through the motor, which dictates the speed at which the blower fan works. Blower resistors, being a mechanical component, are prone to wear and are the most common point of failure in a vehicle’s air-conditioning system. This article will focus on mechanical blower resistors, their construction, and troubleshooting.

What’s bad the AC switch or the blower motor resistor?

The majority of the time when dealing with a symptom as such only blowing on high speed is usually a bad blower motor resistor. Very rarely the main AC switch goes bad but, but don’t count it out completely.

I would say replace the blower motor resistor first before. If the blower motor resistor is replaced and the condition still exists, the main AC nob is faulty.

How to replace blower motor resistor

Just about every vehicle have the blower motor resistor in the same location, but every car’s procedure to remove the blower motor resistor is different.

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