What workarounds did people try for "Is my outside unit leaking oil or condensation?"?

Community members documented 16 workarounds: 1. Calling a technician 2. Touching the liquid to check if it is oily 3. Checking if the unit is still working 4. Using dish soap and water 5. Looking into cheap budget refrigerant detectors from hardware stores 6. Having a technician periodically repressurize the system 7. Using leak sealant and UV dye 8. having a roofer come out 9. Asking online for help to locate components and identify leaks 10. looking up and around the area to check for the source of the leak 11. Wiping up the drops with a towel to check their consistency 12. Inspecting the ceiling above the parking spot for overhead leaks 13. pressurizing the system with nitrogen and spraying soapy water 14. injecting dye into the system and running it 15. Checking fluid levels on dipsticks 16. Moving the car to see if the puddle reproduces in a new spot

Is my outside unit leaking oil or condensation?

Noticing a green liquid dripping from the bottom of an outside unit makes it hard to tell whether you are looking at harmless condensation or a leaking oil tank. Without knowing the difference, it is difficult to determine if the equipment is failing.

Overview

Last updated Oct 31, 2026

People affected12 accounts across 5 forums

Workarounds found16 items attempted

Community agreement8 total upvotes

What the numbers show

Counted from the threads quoted below. How we count

The most recent one is from October 2026.
This comes up 8.6× more often in r/hvacadvice than across the site as a whole.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

16 items+ Contribute

Found another way around this?

Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.

1
Calling a technician
Did this help you?
2
Touching the liquid to check if it is oily
Did this help you?
3
Checking if the unit is still working
Did this help you?
4
Using dish soap and water
Did this help you?
5
Looking into cheap budget refrigerant detectors from hardware stores
Did this help you?
6
Having a technician periodically repressurize the system
Did this help you?
7
Using leak sealant and UV dye
Did this help you?
8
having a roofer come out
Did this help you?
9
Asking online for help to locate components and identify leaks
Did this help you?
10
looking up and around the area to check for the source of the leak
Did this help you?
11
Wiping up the drops with a towel to check their consistency
Did this help you?
12
Inspecting the ceiling above the parking spot for overhead leaks
Did this help you?
13
pressurizing the system with nitrogen and spraying soapy water
Did this help you?
14
injecting dye into the system and running it
Did this help you?
15
Checking fluid levels on dipsticks
Did this help you?
16
Moving the car to see if the puddle reproduces in a new spot
Did this help you?

Tried another approach not listed above?+ Share your workaround ↑

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/HomeImprovement1 person · October 2026

“Noticed this small puddle under one of the valves of the well water tank. It’s not water, has a filmy/oily consistency.”source ↗

“And more importantly what’s the remedy and urgency?”source ↗

hvgotcodes · r/HomeImprovement · 1 upvotes

r/HomeMaintenance1 person · September 2026

“Is this oil tank leaking or is it condensation? Nothing on the floor.”source ↗

Traditional-Oil7281 · r/HomeMaintenance · 1 upvotes

r/homeowners1 person · September 2026

“Who would you call to figure out the source of water leaking from my bathroom vent only when it rains.”source ↗

alyssameh · r/homeowners · 1 upvotes

r/hvacadvice4 people · September 2026

“Moved into a dorm room and shortly after the AC system sprung a leak and can't hold refrigerant for more than a day it seems.”source ↗

“Maintenance has refilled it 3 times so far but hasn't been able to find the leak, seems management is cheap and doesn't provide the tools except dish soap and water.”source ↗

King_Spitfire · r/hvacadvice · 1 upvotes

“I’ve been struggling with a slow refrigerant leak for about 6 months (since I moved into this home).”source ↗

“Every couple months the unit stops cooling the house and my HVAC guy comes out and repressurizes the system”source ↗

“Two months later, the system no longer cools.”source ↗

AspectIcy173 · r/hvacadvice · 1 upvotes

“Green liquid spilling out from the bottom of the outside unit.”source ↗

“This was during the morning while I was cutting grass and notice it was dripping a green colored liquid.”source ↗

Pale_Bottle_4674 · r/hvacadvice

“I know nothing about HVAC, we bought this home 4 months ago. It's almost 7 years old. What does this mean?? Also, I don't see a place to replace our filter”source ↗

Substantial_Shoe1382 · r/hvacadvice

r/MechanicAdvice5 people · September 2026 – October 2026

“is this oil mark or coolant?”source ↗

x_gangsa · r/MechanicAdvice · 1 upvotes

“Am I overthinking it? Is it coolant? Or could it be something as silly as tire shine?”source ↗

“The car is a 2026 VW golf R 2.0, so I immediately just jump to conclusions about leaking coolant.”source ↗

Excellent_Loan2644 · r/MechanicAdvice · 1 upvotes

“Lo and behold once I fill the system up and start the truck I just see a barrage of bubbles from the evaporator core.”source ↗

Blackvenom46 · r/MechanicAdvice · 1 upvotes

“vacuum held but it didnt leak til the compressor kicked in, that's the thing with dynamic vs static pressure.”source ↗

lostinfamy0 · r/MechanicAdvice

“Hi, im new here, it rained this morning and I noticed a rainbow puddle at the front of my car, what's weird is that it doesn't have a smell, so I have no idea what it could be, anyone know what it could be?”source ↗

“My car is a 2014 Nissan versa note, pretty sure the engine is a 1.4 or 1.6L”source ↗

DifferentTravel7323 · r/MechanicAdvice