Where is the car air conditioning sight glass hole located?

[DeAlejandro]

Car air conditioning sight glass hole is located in the engine compartment. Here are detailed explanations about it: 1. Explanation one: It's normal to see bubbles in the refrigerant sight glass. Every vehicle's air conditioning system will show a small amount of bubbles in the sight window because there's inevitably some gas mixed in when refrigerant is collected into bottles during production. 2. Explanation two: The standard refrigerant charge should be determined either according to the standard refrigerant filling quantity marked on the product nameplate of the air conditioning system, or by roughly estimating the appropriate refrigerant charge based on the operating state parameters of the air conditioning refrigeration system pipelines. 3. Explanation three: Generally, the high pressure of car air conditioning systems is around 150, and the low pressure is around 30 (these two values are marked on refrigerant gauges). This represents the optimal pressure state for most air conditioning systems.

[LaLincoln]

As a car owner with over a decade of driving experience, I think the 'glass hole' you mentioned probably refers to the air conditioning drain hole. It's located at the base of the front windshield, specifically in the plastic drainage channel along the edge of the hood. Every time you turn on the AC, the hot air evaporated inside the car condenses into water on the evaporator, which then drains out through this hole to prevent water from accumulating inside the car and causing mold or damp floors. I recommend checking this hole regularly - for example, using a high-pressure water spray during car washes to prevent leaves or debris from clogging it. If blocked, it may lead to high humidity inside the car, foggy windows, or musty odors, which can affect health. If you're unsure of its location, open the hood and look for small holes near the windshield area. Designs vary slightly between car models, but they're generally similar. In short, keeping this hole clear is a small detail that makes a big difference, especially during summer and rainy seasons, as it significantly improves comfort.

[DiBraxton]

When repairing cars, I often encounter this issue. The air conditioning drain hole is typically located at the lower part of the engine compartment near the base of the windshield wipers. It's designed to drain condensation from the evaporator; otherwise, water can accumulate in the AC system, causing odors or damaging wiring. The exact position may vary slightly between models—sedans often have it under plastic trays, while SUVs might position it lower. I recommend checking the hole for blockages every few thousand kilometers and clearing any obstructions with a soft tube by blowing air through it. Also, note that this hole is unrelated to the windshield—don't mistake it for a window drain. It serves purely for AC system drainage, and proper maintenance can prevent electrical faults and extend component lifespan. Simple self-checks can avoid major repairs, making it both practical and hassle-free.

[DelIsaac]

Hi, I guess the hole you're referring to is most likely the air conditioning drain tube, that little hole under the front windshield where water drips out. When the AC is on, it discharges condensation water - totally normal, just don't let it get clogged. I always clean that spot during car washes by poking it with a wire, easily preventing potential issues. You can easily locate it along the inner edge of the engine hood.