What is the reason for the car compressor turning on and off intermittently?

[StevenDella]

Compressor intermittently working and stopping is a phenomenon of compressor protection, which is the recovery time of the compressor's thermal protector. Normally, it only takes a dozen to several dozen minutes, but after prolonged use, these values may change. The main reasons for protection are threefold: 1. Lack of refrigerant: This causes 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. 2. Excessive compressor exhaust pressure: This leads to increased operating current, which in turn triggers current thermal protection. There are many possible causes, such as poor ventilation of the external heat exchanger, clogged heat exchanger, or malfunctioning external fan motor, all of which can result in this situation. 3. Faulty thermal protector of the compressor: This situation is troublesome and usually requires replacing the compressor. If this is the case, it might be better to replace it with a new compressor.