Why Your Car A/C Only Work On High & How To Fix It

If your car’s air conditioning isn’t working, it’s not just a nuisance. It can be dangerous and even deadly if you’re stuck in traffic without it. However, there are times when your air car A/C only works on high but not on any other setting. This can be frustrating as you’ll need to invest more money into repairs or buy a whole new unit altogether.

In this article, we’ll explain why this happens and how easy it is to fix!


The compressor is the most common issue and is not an electrical part. The compressor is a small motor that converts refrigerant into gas to cool your car’s interior. It’s located in the front of your car, under a plastic cover with screws holding it in place.

If your car A/C only works on high, this could indicate that something is wrong with your compressor or evaporator core (the part inside where air passes through). You can buy these parts separately if needed — but before you do so, make sure there isn’t any other solution!

A/C Controls

The airflow control regulates the air from your vents, which you can control by pressing a button to select low, medium, or high settings. If your car only blows cool air on high, be sure this is set to medium or low.

The temperature control adjusts how cool or warm you want your cabin temperature to be. This can also affect whether or not you have airflow in some cars (for example, when it’s extremely cold outside). If your car still isn’t blowing any air through its vents after checking these settings, try turning it off and back on again; this may fix minor mechanical problems with the system or reset a circuit breaker within the HVAC unit. You can also check if there are any leaks in hose lines that could cause problems with airflow over time if left unchecked long enough — but this is generally easier said than done!

Power Leak

If your A/C only works on high, there is likely a leak somewhere in the system.

First, look at the compressor and check for any obvious leaks or signs of damage. If there are no obvious leaks around the compressor, then you should check for leaks around where your lines meet up with the evaporator core. If you can reach those areas without having to remove anything else from under or inside your car, try looking closer at those connections for any signs of fluid dripping onto the ground when you turn on the A/C.

Compressor Clutch

The compressor clutch is a mechanical device that disengages and engages the compressor. It is a part of the refrigeration system located on the compressor. The clutch pedal can be engaged or disengaged by pressing it down or up. When you engage your car’s A/C system on high, this mechanism activates and drives the compressor to produce cool air at maximum capacity. It converts mechanical energy into heat, which means it must operate at all times when your air conditioner is working. The clutch pedal can engage or disengage this gas flow from the compressor by engaging or disengaging its gears with its pulleys.

Electrical Short

If your car’s air conditioner only works on high, there is likely an electrical short somewhere in the system. An electrical short can occur when a loose or broken wire or something else in the system has come into contact with the wires and caused a breakdown of insulation between them.

If you suspect this might be the case, check for loose connections first. If everything seems to be attached properly, look for blown fuses or bad connections before assuming there is simply no power coming into your vehicle’s electrical system!


We hope this article has helped you identify the problem and can help you fix it. Don’t hesitate to get in touch with us if you have any questions or need help with your car AC.