Leaks & smells

Clear water leak from AC - is it normal?

A clear, odorless water puddle appearing under the middle of the car after AC use is virtually always normal condensation from the AC evaporator draining out, not a leak to worry about.

Difficulty
Easy
Time
5 minutes

Symptoms

  • Clear water puddle under the car, usually centered near the windshield/firewall area
  • Appears specifically after or during AC use, especially in hot or humid weather
  • No color, smell, or oily texture to the water
  • No other symptoms like reduced cooling or dashboard warnings

Likely causes

  • CommonNormal AC evaporator condensation drainageThe AC removes humidity from cabin air as it cools it, and that water is designed to drip harmlessly out from under the car through a drain tube.

What to do

  1. Confirm the water is clear, odorless, and not oily, sticky, or colored.
  2. Note that the puddle size can be larger on hot, humid days when the AC is working its hardest and removing more moisture from the air.
  3. Check that the puddle is roughly centered under the car near the windshield/firewall, the typical location for the evaporator drain.
  4. Only investigate further (see the coolant or AC leaking inside guides) if the water has color, smell, or if you notice water pooling inside the cabin instead of dripping out underneath.

When to call a pro

No mechanic visit is needed for a normal clear AC condensation puddle; see one only if the water has color/smell or if it's leaking inside the car instead of underneath.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.