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Old 01-01-2012, 03:36 AM   #14
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 41,158
 

2003 L-Series 3.0L Sedan
Default Re: 2001 L300 Heater Core/Hose Leak

There is no rocket science to reverse flushing a heater core.

1-Drain coolant from the engine for reuse or in preparation for new coolant.
2-Disconnect the two heater core hoses from the engine so the hoses and heater core are ready for force feeding garden hose water.
3-Butt connect a garden hose to one hose and wrap tightly with a rag and run water through until it comes out the other hose clear. Use about half water pressure, just enough to make water flow through with a good stream coming out the other end.
4-Switch the garden hose over to the other hose for 'reverse' flushing and run water through until clear water runs out the first hose.

If done correctly and water flows out then the hoses and heater core are free flowing. Any clog will usually blow out almost immediately with garden hose pressure. The garden hose connections don't have to be tight as much as preventing leaks while forcing water through the hose/heater core/hose. By switching the flow into the other hose just ensures water flow both ways to force any blockage to quickly flush out. Using water pressure is more than enough to flush out virtually any blockage. Performing this flush will demonstrate how coolant flows easily through an unblocked heater core while ensuring the person performing the flush experiences the process.

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