Case Study: EV Air Conditioning Not Cooling Caused by an Electronic Expansion Valve

A real workshop case: a battery-electric sedan with no cooling and excessive compressor noise. The compressor was replaced to no effect, and the fault was finally traced to a stuck electronic expansion valve on the evaporator side.

EV Air Conditioning Not Cooling: A Step-by-Step Diagnostic Guide

Air-conditioning complaints fall into two typical patterns. One is warm air or weak cooling, which may be battery high-temperature protection or a blocked condenser. The other is no cold air at all, in which case feel the low-pressure line to judge the state of the refrigerant; if it is at ambient temperature, the system needs in-depth repair.

Compressor Oil Inspection and Replacement: Practical Guidance

Many workshop problems trace back not to low refrigerant but to the condition of the compressor oil. Technicians often check charge and pressures while overlooking the oil inside the compressor. Degraded, blackened or contaminated oil may seem fine at first, but the fault always returns.