AC Compressor Clutch Always Engaged; Why?

If you see your Ac compressor clutch is always engaged, then it means that you have got a problem in your car. This situation means that the refrigerant inside your car keeps on freezing, and it will be solved if you replace or fix the compressor switch. 

This guide will help people understand the AC compressor clutch and what it does exactly. Because if you have a faulty AC compressor in your car, you will not be comfortable as it can get a low temperature inside the car. 

A/C Clutch Stays Engaged: How Does AC Clutch Work?

Air conditioning compressors work by cycling on and off to maintain the desired temperature inside your car cabin, for example.

They use various sensors, such as the air temperature sensor, evaporator temperature sensor, or low-pressure switch, to measure when cooling is needed.

The AC compressor clutch controls the cycling of the air conditioner compressor motor to give optimum performance. Whenever the vehicle’s electrical system determines that the AC compressor must cycle on, it sends an electronic signal to the clutch.

The clutch then actuates a small pump that pressurizes oil inside a piston. 

This pump is powered by an electric motor and always runs when the car is running. Once pressure is built up inside the piston, a hydraulic thrust bearing pushes against a crankshaft, forcing it forward. 

This motion imparts rotation to a pivot key on one end of an armature, which moves another on another armature. 

This moves a lever that eventually closes a contact switch to activate the AC compressor and opens another contact switch to deactivate it. The pump then returns to its at-rest position, and the circuit starts again. 

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Ac Compressor Clutch Always Engaged: How To Fix It?

Your air conditioner clutch stays engaged even after the engine has been turned off, which is a common problem that can be a pain to fix. 

So to begin, it’s essential to know the difference between the A/C clutch and the engine clutch. 

The engine clutch disengages when you turn off your car, while the A/C clutch remains engaged to help your air conditioner maintain its adequate operating temperature.

Installing a manual over-ride switch on your A/C system will allow you to disengage the A/C without turning off your car.

It is swapping out your vehicle’s original thermostat for a new one that has an override feature integrated into its design or repairing an electrical fault in one of your vehicle’s wiring harnesses. 

Try to focus on this process:

  • Diagnose the problem first before swapping out a thermostat or wiring harness. Then, try to start your car with the A/C engaged and turn off your vehicle again. If your A/C still finishes cooling after a few minutes, then it’s likely that other issues are causing this problem. If your engine still turns off after several minutes, then you’ll need to move on to the next step.
  • Start by taking note of everything in front of you. Then, look inside your vehicle at all of the various parts and systems that come into contact with the A/C system. 

Pay particular attention to any of these components. A/C compressor relay monitors and switches power to the A/C compressor and auxiliary air pump Relay to monitor and switch power to your vehicle’s coolant temperature sensors.

Fans that move air through the system Expansion valve on your A/C system Heater blower Relay, the relay changes from hot to cold depending on whether or not you have heat. 

AC Compressor Always Working: Common Causes

Fixing car AC compressor always ON-and no cut-off

There are multiple reasons why this might happen, but when it does, there are some simple repairs you can carry out yourself that are usually effective.

Here is a list of the possible causes of a faulty AC and what you can do about them:

  1. Faulty Thermostat – The thermostat may have failed or broken and needs to be replaced. 2) Faulty Compressor – The compressor may have failed or broken and needs to be replaced.
  1. Faulty Air Conditioner Heater – The heating element in the air conditioning may have failed, causing the AC not to work. This can usually be fixed with a new element and a new thermostat.
  1. Blocked Drain Pan or Tank Hoses – If your drain pan has both water and debris in it, it will cause the AC to work less efficiently. You can fix this by removing the drain pan and vacuuming water and debris. If your tank has a riser hose, this will cause the problem. Again, you can fix this by changing the drain pan and riser hose.
  1. Broken Fuse – If this is the case, you will want to call an electrician to fix it. Again, this is because you cannot fix this yourself.
  1. Defective Air Conditioner – If you have a portable air conditioner, check out these tips on diagnosing and repairing it yourself.

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What Is AC Compressor Clutch?

AC Compressor Clutch Always Engaged
AC Compressor Clutch Always Engaged

The AC compressor clutch is an electromechanical device shaped like a cylinder attached to the air conditioning A/C compressor. 

An electric motor located on the shaft helps in powering it. 

When the accelerator pedal is depressed, power from the engine goes through a belt and through gears to turn this motor, which rotates and forces air out of the compressor’s discharge side while drawing in low-pressure, ambient air on its suction side. 

More free air coming into the system results in the cooling down of the hot condenser coil more quickly, resulting in a rapid drop down in temperature. 

This reduces the load on the engine while A/C remains running and does not require any mechanical intervention by the driver during regular operation. It is fixed to one side of the compressor but can also be mounted on both sides.

Its operation depends on the position of an arm attached to this motor, i.e., whether the clutch is engaged or not. 

When the engine is idling or accelerating, its power comes through a belt and gears to this motor, which then rotates clockwise and forces air out through the compressor discharge side as it draws in air from outside through its suction side. 

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