The only proper solution is to replace the heater core. This is a significant repair job and is typically best left to a qualified mechanic, especially for a minivan where access can be difficult. The process involves:
* Draining the coolant: This is crucial to prevent a mess and protect the environment.
* Accessing the heater core: This usually requires partial or complete disassembly of the dashboard, which can be labor-intensive and require specialized tools and knowledge.
* Removing the old heater core: This can be tricky due to its location and potential corrosion.
* Installing the new heater core: This requires careful attention to ensure proper sealing and connection to the coolant lines.
* Reassembling the dashboard: This is the reverse of disassembly and requires patience and precision.
* Refilling the cooling system: Using the correct type and amount of coolant is essential.
* Bleeding the air from the system: This prevents air pockets from interfering with coolant flow.
Attempting a DIY repair on a heater core is strongly discouraged. The potential for damage to other components and the cost of replacing those components could easily exceed the cost of professional repair. Getting a quote from a reputable mechanic is the best first step. They can accurately assess the damage and provide you with a fair estimate for the repair.
