[alan3463]

hi
I have a Peugeot 207 sport 57 plate.I am losing coolant from the expansion bottle and the drivers foot well is wet.The problem only seems to arise when the heater is on hot and the car is driving.If the car is just sitting idling it is ok,so seems just when under pressure.We have replaced the heater matrix but still the same problem.Does anyone have any clues to where the leak could be.
Thank you
i

 

[rustyroger]

Either the new matrix is faulty, or a hose is leaking, or not properly fitted to the matrix.
Possibly there is a water valve in the system as well that could be the culprit.
Coolant is getting into the footwell, that is obvious. I fear you need to get under the dashboard again for a further look, checking while the system is under pressure.

Roger.