Symptoms of a Bad Refrigerant Pressure

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About this sample

About this sample


Words: 1242 |

Pages: 3|

7 min read

Published: Jul 10, 2019

Words: 1242|Pages: 3|7 min read

Published: Jul 10, 2019

Table of contents

  1. AC System cutting on and off Rapidly
  2. Unable to cool the car
    Unable To Start
    Monitor Engine Light
    Particle Accumulation
    Mass Air Flow
    Mass Air Flow Sensor Symptoms
    Replacement cost

The AC pressure switch is a safety switch that is mounted on both the high and low sides of the air conditioning system. It monitors the pressure of the refrigerant on its respective side of the system. There is a high side pressure switch, and low side pressure switch, and they both serve to monitor the system for pressure faults that can damage the compressor.

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When the pressure is too low, the compressor risks damage due to running with low oil. When it is too high, the compressor is at risk of overheating and becoming damaged. Depending on which side of the system the sensor is mounted in, when the pressure rises too high or drops too low, the switch will turn off the compressor to prevent damage from occurring. As the pressure switches serve to protect the compressor and rest of the system from damage, they play an important role for the proper function and service life of an AC system, so they should be replaced if they are causing problems. When they begin to fail they will usually display a few symptoms that will alert the driver of a potential problem.

AC System cutting on and off Rapidly

Repeatedly cycling on and off is part of the normal operation of an AC system. There are periods when the AC is turned off, such as when the proper temperature has been reached, and the pressure is adequate. However, if the system is cycling on and off very frequently or more rapidly than normal, it could be a sign that the cycling switch is not functioning properly.

Unable to cool the car

If either of the AC pressure switches fails, then the system will have a difficult time maintaining the pressure required to function properly. If the pressure is not right, then the AC system will not be able to produce the cold air required to adequately cool the cabin. You may notice that the cabin takes longer than usual to reach the correct temperature, or may not even be able to reach the correct temperature at all.

Unable To Start

As the pressure switches control the on/off function of the AC compressor, a switch failure can prevent the AC compressor from functioning at all. The compressor is what pumps refrigerant through the entire system. If it is not functioning, then the system can not operate, and will be unable to produce cold air.

Because the AC pressure switches play such a vital role in ensuring the proper operation and service life of the AC system, any problems with them should be addressed immediately to ensure the integrity of the system. If you suspect that one of your AC switches is bad or failing, have it diagnosed by a professional technician from YourMechanic. If necessary, they will be able to replace your AC pressure switch so that you can ensure the system remains functioning correctly.

Monitor Engine Light

The most trusted mass air flow sensor symptom is the illumination of the inspecting engine light on the material panel. Several kinds of issues may create the light to arrive on, therefore you should have the car's computer checked to verify whether the light is associated to the mass airflow sensor.

Particle Accumulation

Certain times the mass air flow will not perform well due to the reason it is dirty. Even though the air that sent through the mass air flow is filtered, tiny particles will get by and deposit on the sensor. Mostly, this deposition will not be major sufficient to damage the MAF, but serious accumulation can cause disturbance. In this situations, you can restore it to total performance by eliminating and cleaning it.

Mass Air Flow

The mass air flow is mounted to the cars air cleaner box and linked to the computer by having wiring harness.If you eliminate the bolts and wiring harness, you can also eliminate the whole MAF sensor device and open it to expose. The sensor is a tiny unit with the dual exposed wires, they heat up if the vehicle is running and the mass air flow measures the flow of air by identifying how fast the airflow cools the temperature of the wires. To clean the wires spraying with MAF cleaner or any electrical contact cleaner and allowing the mass air flow to dry is the good method to cleaning the instrument. When it is dry, you can re-install and the vehicle can also be started again. If engine function is restored or the inspection engine fast light goes off, it is possibly that the mass air flow was dirty. The MAF measures the quantity of air arriving in to the engine hence the ECU or engine control unit can measure how much gas and fuel injectors must supply to every cylinder to make the right fuel air proportion.Certain times, a malfunction in the instrument can result to major issues, generally leading in a bad engine function.

Mass Air Flow Sensor Symptoms

The engine drags or unwilling when under load or idle, the engine stalls ԛuickly after starting, the engine hiccups, jerks at the time of acceleration and the engine present abnormal lean or rich idling. If you understand that a false MAF can create a lean condition through underestimating the level of airflow into the engine, you can also know how a faulty mass air flow sensor can be mistaken for a faulty fuel pump set. By getting the knowledge, it is possible that you can give a substitute solution to the problem. Due to this reason, a process known as fuel mapping is availed to decide how much fuel is needed for the particular driving circumstances, new engine administration system usually depend on the exhaust gas sensor to know whether the sensor is having a problem. The PCM injects the measured level of fuel in to the car engine that leads in a positive fuel being shown on the scan tool. Paper, dirt, and oil contamination create most of the mass air flow sensor mistakes.


The pressure of fuel should be examined and stay correct by all ranges of engine function. The oxygen sensors should be operating perfectly to give an exact air ratio feedback to the PCM. The professional technician thinking the fuel and oxygen sensors are performing properly will usually avail furl trim numbers to check whether the mass air flow sensor is perfectly measuring the flow of air into the engine. Most mass flow sensors identification needs professional expertise and tools. By familiarizing yourself with the fundamentals of the MAF function, you can be able to give the mechanic certain useful suggestions and when required to advice him on professional assistance in solving the air combination ratio report.

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Replacement cost

A car mechanic can assess a car's computer at free of cost or at the rate of $55, or you can perform it yourself by availing a digital car diagnostics scanner. The scanners are found at auto parts shops and they are effective differently, they are normally made to be plugged into the vehicle OBD II diagnostic port, hence that they can check the computer data. The scanner will present one or more alphanumeric codes, that may be viewed in a reference book that accompanies the scanner. If you perform this and the codes of the scanner refer to a non-performing mass airflow, you will want to get the MAF checked and possibly replaced. A car's mass air flow sensors are hardly replaced because it is generally cheap to replace them.

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Cite this Essay

Symptoms of a Bad Refrigerant Pressure. (2019, Jun 27). GradesFixer. Retrieved December 11, 2023, from
“Symptoms of a Bad Refrigerant Pressure.” GradesFixer, 27 Jun. 2019,
Symptoms of a Bad Refrigerant Pressure. [online]. Available at: <> [Accessed 11 Dec. 2023].
Symptoms of a Bad Refrigerant Pressure [Internet]. GradesFixer. 2019 Jun 27 [cited 2023 Dec 11]. Available from:
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