Is a clear fluid leak from my car or heat pump dangerous?
Unexpected fluid leaks from equipment like heat pumps or car mufflers can be confusing to diagnose, leaving people unsure whether the liquid is harmless condensation or a hazardous substance like coolant. This uncertainty makes it difficult to know if the problem requires professional attention, or whether to call an HVAC technician, a plumber, or an automotive mechanic.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Insulating exposed copper pipes
- 2Consulting professionals
- 3Using UV dye to trace leaks
- 4Taking the vehicle to a repair shop for professional diagnosis
- 5Rinsing hands thoroughly
- 6Planning to pull the vent off to look inside
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“we have a 2026 Hyundai Tucson Hybrid wtih 14k km on it and I just noticed this drip from the muffler. It is clear and doesn’t smell of anything. it’s a concern?”source ↗
“While changing the filter in my basement unit, I noticed some rust and general wetness that I had seen in the past, but was dumb enough to touch it tonight without thinking.”source ↗
“I’ve been having coolant leaking from somewhere and I didn’t know what the problem could be it’s not the same color of the coolant dex cool that’s orange whatever is leaking from my car is green from underneath on the passenger side”source ↗
“I have a Mitsubishi Heat pump? Is it coolant? Do I need to hire a contractor to fix this? HVAC contractor or a plumber ?”source ↗
“I noticed it leaking when I used the ac last weekend driving home my drive was like an hour and my car started to overheat because I didn’t have any coolant”source ↗
“Hey yall my 2011 accord coupe 4 cylinder is leaking on the passenger side. I had an oil leak and used dye. This liquid is dropping over a pile with UV dye but it's dropping clear liquid. I fixed the actual oil leak and it was still neon so not sure what this could be? It only drips when the car is on”source ↗
“I saw some other comments, no kids, but previous owners had a few kids.”source ↗
Where this came up
People with this problem also raised
- 3How to identify a mystery liquid leaked inside my car
- 5Is my outside unit leaking oil or condensation?
- 2Coolant leak only happens after shutting off the engine
- 5Unexplained powder leak under car
- 9Fluid leak right after an oil change or service
- 4How to figure out where a power steering leak is coming from