I also have coolant pooling on the rear passenger floor. I have had coolant leak to the drivers seat floor, but have not seen any pooling, continue to see pooling in rear. Considered bypassing the heater core, or running a heater core sealer solution through the unit, but the problem seemed to go away. Car has not been driven in a while.

Last year the heater stopped responding, but I was able to drip some lube onto the fan blade and get the motor running and the next day it was responsive again. I think it just needed to be lubed. So at this point I suspect a leak in the heater line or line to the heater core and I already know its extremely hard to get to the heater core. Going to try and trace down the problem by starting somewhere there.

So I am looking for information on dealinig with the heater core on this car.

I am by no means a mechanic just trying to learn and fix things myself! Thanks!


w115 240d 1973