Home DIY How To Jump 3 Wire AC Pressure Switch

How To Jump 3 Wire AC Pressure Switch

In this article, we will discuss tips about how to jump 3 wire AC pressure switch.

You might be having problems on your AC system but can’t seem to confirm. There are common cases wherein the car AC runs well but the switch is faulty, depriving you of a sufficient AC efficacy.

That is why you might want to jump 3 wire AC pressure switch or perform some related DIY repairs.

Refer: Why Car Air Conditioner Not Blowing Cold Air When Idling

Symptoms of a Bad AC pressure switch

First, here are some symptoms on a failing AC Pressure Switch

1. Unable To Cool The Car

You’ve set the knob on maximum but still can’t feel the coldness you’re supposed to experience inside the car cabin – this is a clear sign of a faulty AC pressure switch.

The system will have a hard time preserving the necessary pressure to keep the AC running.

As a result, the AC system won’t be able to emit enough cold air to keep the cabin temperature conducive due to unstable pressure.

You’ll also notice the AC takes a longer time to cool the cabin or reach the right temperature. Worse scenarios include the AC not being able to cool the cabin at all.

2. Unstable AC System

It’s normal for the AC system to repeatedly make an on and off cycle.

When the sensors detect the right temperature has already been reached, the AC system will automatically put itself in idle.

Otherwise the cabin becomes colder and colder than what’s stated in the command.

When the sensor detects the temperature has subsided to a certain level, it will trigger the AC system to turn on again to fill the cabin with cool temperature, consequently reaching the desired temperature again. And the cycle repeats.

The on-off cycle is not a problem as long as the system does it in the right interval. However, if you notice a frequent or abnormally rapid on-off cycle, you can fairly conclude there’s a problem with your AC switch.

The cycle switch is probably not functioning well.

3. Compressor Is Off

Another tell-tale sign that your AC pressure switch is no longer working properly is when the compressor is not coming on.

The AC pressure switch is responsible of controlling the on and off function of the compressor.

Failure in the part of the switch has a direct effect on the AC compressor. Simply put, the AC compressor fails if the AC pressure switch also fails.

The role of the compressor is to pump the refrigerant into the entire AC system. It’s responsible of delivering the cool air you are feeling inside your car cabin. If it’s not able to do its job, your system itself won’t be able to produce cold air.

Refer: Symptoms Of A Bad Idle Air Control Valve

How To Jump 3 Wire AC Pressure Switch

The three wire switches is also called as pressure transducers. These are used with GM variable control compressors and displacement compressors.

It does the process by monitoring fan operation, high pressure, and low pressure, then sending the information back to the computer for it to analyze.

The fan will turn on once the pressure level attains a predetermined high side pressure.

Moreover, too high and too low pressure will shut the compressor off. The set up for fan operation differs depending on the make and model. Careless handling will fry the ECM.

Here are some tips gathered from different owners who have experienced doing it themselves.

There are also some additional important tips related to the matter at hand. Read them all and try to incorporate what you have learned into your own application.


The AC pressure switch indeed plays a very significant role in ensuring a comfortable environment in your car – and that is only possible if the AC system is working at optimum level.

The said pressure switch ensures a stable AC system in terms of service life and proper operation.

Preserve the integrity of your system by addressing possible symptoms that you might notice while driving your car.

First, you must know the symptoms of bad AC pressure switch so you can properly diagnose the matter at hand.

To confirm everything, you can call a professional technician and let them handle the rest. You will be told whether you need to replace your AC pressure switch or not.

You must also keep in mind some tips on how to jump 3 wire AC pressure switch for future references.

There are surely some risks that may come but handling the issue is part of being a responsible car owner. Start incorporating what you have learned right away.

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