Review on 🔍 ACDelco GM Original Equipment 10-5057 Engine Cooling System Tracer Dye - 1 Fluid Ounce by Maurice Cunha

I have been struggling with a slow coolant leak in my 1990 pickup for almost 10 years. It only leaks when the engine is hot and there is pressure in the cooling system, but I couldn't find it. When it arrived I applied paint and drove for a while then parked the truck for the night. The next day I took my IR light and started searching and when I crawled under it I saw a bright green glow hidden under the heater hoses where the connection to the firewall was. The area below them glowed a very bright green. When I grabbed one of the hoses, the pipe detached from the heater core and when I removed the hose there was a large crack in the heater core pipe on the other side. This would surely leave me stranded at the side of the road. Luckily I don't drive this truck very often, so I'm lucky. This product shows the leak easily with good IR light. I'm glad I got it and my leak went away after replacing the heater core.