1. Locate the heater matrix. The heater matrix is located behind the dashboard, on the passenger side of the car. To access it, you will need to remove the glove box and the dashboard trim.
2. Inspect the heater matrix for leaks. Once you have access to the heater matrix, inspect it for leaks. Look for cracks or holes in the matrix, or for any signs of leaks around the connections.
3. Repair the leak. If you find a leak, you will need to repair it. This can be done by using a sealant or by replacing the heater matrix.
4. Reassemble the dashboard. Once you have repaired the leak, you will need to reassemble the dashboard and the glove box.
Here are some additional tips for repairing a leak on the heater matrix of a Peugeot 307:
* Make sure that you have the right tools and materials for the job.
* Work in a well-ventilated area.
* Follow the instructions carefully.
* If you are unsure about how to perform the repair, consult with a qualified mechanic.
