What Causes Frosting on the Expansion Valve?

[OAllie]

Here are the specific reasons for frosting on the automotive air conditioning expansion valve: 1. Pipeline malfunction: During the installation of the indoor and outdoor unit connecting pipes, if the bending angle of the pipeline is too small, it can lead to pipe cracking, refrigerant leakage, or a lack of refrigerant. When installing the connecting pipes, increase the bending radius appropriately to prevent the pipes from being bent too sharply. For pipes with refrigerant leaks, promptly perform repair welding or replacement. 2. Leakage in the refrigeration system: When replacing components of the refrigeration system, improper secondary installation of the parts can result in refrigerant leakage points in the pipelines and the refrigeration system. Apply a not-too-concentrated soapy water solution to the entire refrigeration system pipelines and areas with welding points for leak detection. The testing conditions require the refrigeration system to be filled with nitrogen or refrigerant. Pay close attention to inspecting areas with oil stains on the pipelines, identify the leakage points one by one, and perform component repair or replacement based on the actual situation.