How to Determine if the Evaporator is Leaking?
3 Answers
Check whether the car air conditioning is cooling and if the air conditioning system needs refrigerant. Add fluorescent dye along with the refrigerant. If there is a leak, the leaking point will glow, indicating that the component is damaged.
I've been driving for over ten years and have encountered evaporator leaks several times. The main indicators are the air conditioning not cooling or poor cooling performance, such as the cabin temperature not dropping when the AC is on during summer. Additionally, smell is crucial—if the air coming out has a slightly sweet or chemical odor, it's usually a sign of refrigerant leakage. Sometimes, when inspecting the engine bay, you might notice oil stains or dirt clumped together near the evaporator. This happens because leaking refrigerant carries away the compressor oil, leaving behind residue. I also recommend regularly checking the AC pressure gauge—low pressure indicates a leak in the system. Remember, if you notice these issues, don't delay. Get it fixed at a repair shop as soon as possible to avoid damaging the compressor or other components, which could compromise driving safety.
I enjoy fixing minor issues myself. To determine if the evaporator is leaking, pay attention to two signs: first, the air volume is normal when the AC is on but the air isn't cold; second, there's an unusual odor inside the car, especially a sweet, fruity smell after turning on the AC. For inspection, turn off the engine, remove the interior panel behind the glove box, and use a strong flashlight to examine the evaporator housing for any oily or damp spots, which indicate leaks. If possible, you can use a UV light to check for traces of fluorescent dye or listen for hissing sounds in the engine bay. However, if you lack the tools, the most straightforward method is to observe the symptoms. Once a leak is confirmed, the evaporator core usually needs replacement, which requires professional tools for disassembly and installation. It's advisable for beginners not to attempt this without proper equipment.
