Heater core leak

Well it could be leaking out of the core, and then running along some part of the lower dash and then coming out down there. But are your sure that it is coolant and not just condensation from running the A/C? There should be a drain for that condensation down there, but after years of collecting dust and crud they clog up, and then you get water on the floorboards. I would clean up everything down there and make sure that the condensation drain pipe is clean. It should be running through the firewall and come out under the hood.

Well then the best thing I can say to do is to hook everything back up, and run a cooling system pressure test on it. Here is a guide: https://www.2carpros.com/articles/radiator-pressure-test. You can borrow a pressure tester from AutoZone with a deposit. Basically, pump up the pressure and see if it comes out anywhere down there.

Generally I would say that you need to flush out the system. I will check this evening and see if there is anything else that could cause that.

So I dug around to see if the system was vacuum controlled or electronically. It is electronic. If it was vacuum controlled, I would suggest digging around under the hood looking for vacuum leaks, as that would cause the heat to work the way you mentioned. Since it is not vacuum controlled, I would suggest flushing out and bleeding the system.

If you do no know how, here are some basic instructions. (1) With the engine cold, raise the hood and disconnect the heater core hoses from the engine side. (2) Point one hose where it won't leak on any electrical's or other important stuff. (3) Hook up your water hose to the other heater core hose (you might have to get creative here). (4) Turn the water on, low pressure. (5) Let it run until the water coming out is clear, and then another couple of minutes after that. (6) Unhook the water hose and put the heater core hoses back on. (7) Bleed the cooling system instructions are next.

(1) With the engine cold, raise the hood and take off the radiator cap. (2) Start the car and turn the heat on, full blast. (3) Let the car idle a while, until it starts warming up some. (4) With the car still idling, and the heat on, look down into the radiator and watch the coolant level. As air works through the system, it will come up at the filler area (where the cap goes). You simply fill it whenever the level drops. Repeat the process until the coolant level stops dropping.

Again, good luck and let us know.

Hey that is great to know. We will be glad to help any time!