How to Solve the Problem of Car Compressor Starting and Stopping Intermittently?
3 Answers
Compressor starting and stopping intermittently is because the air conditioning compressor automatically starts or stops according to the set temperature, rather than running continuously. Below are the relevant explanations: 1. Compressor phenomenon: The intermittent operation of the compressor is a protective phenomenon, representing the recovery time of the compressor's thermal protector. Normally, it only takes a dozen to several dozen minutes, but after long-term use of the compressor, these values may change. 2. Reasons for protection: One reason could be a lack of refrigerant in the system, causing the compressor's exhaust temperature to trigger thermal protection. Even if there are white bubbles at the needle valve, it only indicates the presence of refrigerant in the system, but the amount and whether there is a deficiency cannot be determined. Another reason could be excessively high compressor exhaust pressure, leading to increased operating current and subsequent thermal protection due to current. There are many possible causes, such as poor ventilation of the external heat exchanger, clogged heat exchanger, poor external fan motor, etc. Another possibility is a faulty thermal protector in the compressor, which is quite troublesome and usually requires replacing the compressor.
The air conditioning compressor keeps starting and stopping after a short while, which could be caused by various issues. The most common reason is insufficient refrigerant. The AC system requires an adequate amount of refrigerant to operate continuously. If the level is too low or there's a leak, the pressure sensor will detect the problem, causing the compressor to cycle on and off repeatedly. A faulty temperature sensor can also cause this issue—misreading the cabin temperature may trigger frequent switching. I recommend first checking the refrigerant level and getting a professional measurement at a repair shop. If a leak is found, it should be repaired promptly. Additionally, electrical problems like a worn-out relay or a blown fuse can lead to similar symptoms. The first step is to pop the hood and check the fuse box for any issues. Pressure and temperature control in the AC system is a delicate process, and neglecting it can damage the compressor or even affect fuel efficiency. Addressing the problem early can save you from costly major repairs later. In short, unstable AC while driving is annoying and unsafe—don't tough it out; consult a specialist.
My car also experienced frequent cycling of the AC compressor. At first, I thought it was normal, but later discovered the coolant was nearly depleted. This is quite common - when refrigerant is low, there's poor electrical contact, or pressure sensor issues occur, the AC starts acting up. Pressure fluctuations cause the compressor to cycle on and off, not only reducing cooling efficiency but also wasting fuel. Last time I went to the dealership, the technician used professional tools to check coolant concentration and pressure values, identifying a small leak that was repaired at moderate cost. You can also try inspecting the fuse box for signs of blown fuses yourself, but avoid disassembling components to prevent electrical hazards. If the compressor keeps cycling like this, it's prone to overheating, shortening its lifespan and increasing repair costs. I recommend not delaying repairs - the AC is a lifesaver in summer. Addressing issues promptly makes driving more comfortable and hassle-free.
