Clear Water Leak Under BMW 3 Series (AC Off)
Clear water leaking from under the vehicle when the AC is not running is unusual. Since the fluid is clear and water-like, it could be condensation from the AC system (if the AC was used recently) or possibly coolant if it's diluted. However, with AC off, the most likely cause is normal condensation draining from the evaporator after recent AC use, or a minor coolant leak from a hose or reservoir.
Diagnosis Details
Possible Causes
Residual AC condensation draining after recent use (even if AC is now off, water may continue to drip for a short time).
Coolant leak from radiator, hose, or expansion tank (coolant can appear clear if diluted, but usually has a color or sweet smell).
Windshield washer fluid leak (usually blue or green, but can be clear if diluted).
Related OBD-II Codes
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What You Should Do
Check the fluid color and smell.
If it's pure water and stops dripping after a few minutes, it's likely residual AC condensation.
If it continues, inspect coolant level and look for leaks around the radiator, hoses, and water pump.
Also check windshield washer reservoir.
If coolant is low or fluid has a sweet smell, have the cooling system inspected.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
