Dash Heater Core Leak
We have a pin hole leak in the heater core in our dash A/C heater. It is a nusiance. It doesn't leak enough to have to refill the radiator but we smell it inside and the vapor fogs up the windshield ...
Forum Discussion
If I was going to use a stop leak, it would be the one which consists of the aluminum flakes. I have used it a few times in the past and it worked every time, without clogging all of the core passages or leaking again after a period of time unlike Barrs leak (black stuff) which clogged up everything, but also stopped the leak. I would check the unit as others have mentioned, and see if it is somewhat accessible. If it is, I would probably just replace the core unit. A lot of the newer vehicles today have them under the dash where you must rip the whole dash out to access it, hours of work to get to and 10 minutes to change it. Some rv's are much easier to access due to placement than cars or pickups.
