Worried you might have a leak?
Each summer, we get a few calls from people who find a puddle under their car after parking. This year has been different.
In the past few weeks, many more drivers than usual have called us, worried they might have a leak.
Most of these conversations start the same way.
“I parked my car and noticed fluid leaking underneath. I need to get it checked out”.
Seeing any fluid under your car can be worrying, especially if it’s never happened before. Many people who call us have had the same vehicle for years. Their car has probably done this before, but they’re just noticing it now because this summer is much more humid than usual.
In many cases, it could simply be water. More specifically, it could be condensation from your car’s air conditioning system as it pulls moisture out of the air.
Your Air Conditioner Does More Than Cool the Cabin
Most people think of their vehicle’s air conditioner as something that makes the cabin comfortable on a hot day.
That’s certainly its primary job, and in providing comfort, one of the things it does is remove humidity.
As air passes over the evaporator core hidden in the HVAC housing, its temperature drops dramatically.
When the warm, humid air touches the cold evaporator, the extra moisture turns from vapor into liquid water. You’ve seen the exact same thing happen countless times. Think about what happens when you take a cold glass of ice water outside on a hot day.
The water droplets on the outside of the glass aren’t from inside the drink. They come from the moisture in the air around it.
Your car’s air conditioning works the same way.
The only difference is that, instead of forming on a glass, the moisture collects on the evaporator inside your dashboard.
Where Does All That Water Go?
The evaporator sits inside a sealed housing beneath the dashboard.
As condensation forms, it drips into a small collection area built into the HVAC case; from there, gravity takes over, and a small drain tube carries the water through the firewall and safely underneath the vehicle.
On most vehicles, that drain exits underneath the passenger side, generally just behind the front wheel and slightly inboard toward the center of the vehicle.
If you’ve ever parked after using your air conditioner and seen a clear puddle in that spot, it’s probably just normal A/C condensation. In fact, seeing water drain from your car usually means the system is working as it should, removing moisture from the air.
Why Are So Many Edmonton Drivers Noticing It This Summer?
This is where this year’s weather has made a difference. Edmonton typically has a fairly dry summer climate. But lately, we’ve had a long stretch of higher humidity, with levels at or above 68% for weeks.
That might not seem very humid compared to other parts of Canada, but it’s much higher than what we’re used to here for so long; It also means your vehicle’s air conditioner has more moisture to remove before the air entering your cabin feels cool and comfortable.
The result?
Much more condensation, and a puddle that may have been barely noticeable during a typical Edmonton summer can become surprisingly large during extended periods of humid weather.
Your vehicle hasn’t changed—the weather has.
How Can You Tell If It’s Just Condensation?
Normal A/C condensate is usually easy to identify once you know what you’re looking for.
It is:
- Clear and colorless
- Thin like ordinary water
- Odorless
- Not oily or slippery
- Found underneath the passenger side after using the air conditioner
- Most noticeable after parking on a warm day
It may continue dripping for several minutes after you have parked your car, as the remaining water drains from the HVAC housing, which is totally normal.
When Should You Be Concerned?
While water from the air conditioner is harmless, not every fluid under your car should be ignored.
It’s a good idea to get your car checked if you notice:
- Green, orange, pink, blue, or yellow fluid
- An oily or greasy texture
- A sweet smell
- Fluid that appears regardless of whether you’ve been using the air conditioner
- Warning lights or signs of overheating
- Wet carpet inside the passenger compartment
These signs could mean you have a coolant leak, engine oil leak, transmission fluid leak, or even a blocked A/C drain that’s letting water collect inside the car instead of draining outside.
If you’re not sure, it’s always better to have it checked than to guess.
Knowing More Builds Confidence
One of the best parts of our job is helping people understand how their cars work; we look forward to educating you. The more you know about your car, the easier it is to spot what’s normal and what needs attention.
Don’t hesitate to reach out; we’re always happy to answer questions, explain what you’re seeing, and help you make an informed decision.
It is possible your vehicle isn’t leaking at all—it’s just handling Edmonton’s humid summer exactly the way it was engineered to.