I have a 2002 Lexus LS430 that is leaking coolant (orange variety) from the bottom of the passenger side of the engine. I've looked around the water pump, radiator, overflow tank, radiator hoses, and can't find where the leak is coming from. It drips enough to leave a couple quarte size spots on my garage floor each day. Since I can't find where it's leaking from, could I add a bottle of "radiator stop leak" to fix it? If so, which "radiator stop leak" is the best?
You can try the bar sealer they sell at AutoZone I've had good luck with that though often it's the water pump and then off and only leak when it's running at higher speeds if you want to find the source put UV coolant die in the system and see where the ultraviolet die comes out while you shine a UV light on it where in yellow sunglasses they make kids for that
Are you sure that it's coolant and not condensation off the evaporator?
@mountainmanjoe
Yes, definitely coolant. The small spots on the garage floor are orange liquid.
I've heard people say that stop leak plugged up their heater core and they had to replace it. I'd sooner have the leak fixed than use a product. Or use the tracing UV dye.