Arguments for backflushing:
* Cost-effective: Backflushing is significantly cheaper than replacing the heater core. The cost is mainly the time and materials (a garden hose, some adapters, and potentially some cleaning solution).
* Potentially successful: If the blockage is due to minor debris or sediment, backflushing might clear it.
Arguments against backflushing:
* Risk of damage: Aggressive backflushing can damage the heater core's delicate fins, potentially worsening the problem or causing leaks. This is especially true if the core is already weakened by corrosion.
* May not work: If the blockage is due to corrosion, a solidified substance, or a physical obstruction, backflushing is unlikely to be effective.
* Time-consuming: Accessing the heater core lines in a Freestyle is likely difficult, adding to the time investment.
Before attempting a backflush:
* Assess the situation: How long has the rear heater been not working? Is there any evidence of coolant leaks? The more severe and long-lasting the problem, the less likely backflushing will succeed.
* Consider the cost of replacement: Research the cost of a new heater core and the labor involved in replacing it. If the replacement cost isn't significantly higher than the time you might spend on a likely unsuccessful backflush, it might be a better approach.
In summary: Backflushing a plugged heater core is a low-cost, high-risk proposition. If the problem is recent and you're comfortable with the possibility of making the problem worse, it's worth a try. However, if the problem is longstanding or the cost of replacement isn't prohibitive, replacing the heater core might be the more practical and ultimately cost-effective solution. Weigh the risks and rewards carefully before proceeding.
