Instead of trying to clean that tiny hole, focus on addressing the underlying issue that's causing it to clog. Here are the more likely culprits and how to address them:
* Overfilled Transmission Fluid: This is the most common cause. Excess fluid can be forced out through the vent, carrying debris that clogs it. Check your transmission fluid level carefully. Use the proper procedure for your vehicle (often involving running the engine and checking with the dipstick at operating temperature). Drain and refill to the correct level if it's overfilled. This is the first and easiest thing to do.
* Transmission Fluid Contamination: Dirty or contaminated transmission fluid is a significant factor. The debris in the fluid can clog the vent. A transmission fluid and filter change is necessary. This is a more involved process, requiring a drain pan, new filter, and the correct type and amount of transmission fluid. Consult your owner's manual or a repair manual for the specific procedure.
* Internal Transmission Problems: A major internal transmission problem (e.g., worn seals, failing components) can lead to excessive pressure and force fluid out through the vent, carrying debris. This is the most serious possibility and requires professional diagnosis and likely a transmission repair or replacement. Symptoms might include slipping, rough shifting, or unusual noises.
* Vent Line Clog (if applicable): While the vent is internal on many transmissions, some may have a small external vent tube. If your model does, inspect this tube for blockage. Carefully clear any obstructions, but be gentle not to damage it.
What NOT to do:
* Don't attempt to forcefully clear the internal vent: You'll likely cause more damage than good. The hole is incredibly small, and any attempt to probe it could lead to irreversible harm to the transmission.
* Don't use solvents or compressed air: These can damage seals or internal components.
In summary: Focus on correcting the transmission fluid level and ensuring the fluid is clean. If the problem persists, take your vehicle to a qualified transmission specialist for diagnosis and repair. Attempting to directly access and clean the incredibly small ventilation hole is highly impractical and risky. The cost of a professional diagnosis and repair is far less than the potential cost of a damaged transmission caused by an improper attempt at cleaning this vent.
