Plugged Sable Heater Core

Ask Bob: The Auto Answer Man

Dear Bob,
My Sable's heater core is plugged with gunk and not allowing coolant to flow through it to heat the interior. I good auto tech flushed it and got a little of the corrosion out, thus regaining a small amount of heat. But, a full on heater core replacement is very involved and even requires removal of the dash. We're looking at a $400 job! Do you know of any way, I mean ANY way, to ream out some more of the corrosion in the heater core without having to rip the loser Ford lemon apart?
Steve in Grants Pass, OR

The gunk you have in the heater core is probably from an overdose of stop leak. I may have written about this before, but if you cant stop the leak with at most two applications, then it's time to try something else.... as far as the removal of the gunk.... I wouldn't use too much more flush.... Try one more application... you might wind up damaging other components or seals in the system. And you are exactly correct with the amount of effort that is required to change heater cores, but this effort is not just limited to ford products.... almost all heater cores need to be removed in this fashion. One other thing that you might want to try, and I am not sure if this will solve the problem, it might even make things worse, but remove the heater hoses from the core. Then, at the core stubs, use compressed air to try and remove some of the debris. Too much pressure could cause the core to blow up. I make no guarantee that this will work or even not damage he system. If anyone else has any suggestions for this reader, I think he would appreciate it.
Good Luck!
Drive Safely!
Bob, The Auto Answer Man

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