98 Expedition Heater Core issue

[Fitz98]

I did a remove and replace of my factory heater core about 1 or 2 years ago. It was a nightmare project. Had to remove the dash.
Replaced it with a new advanced auto parts unit.
Just had a cooling system leak and took it to mechanic (No time to look at it myself).
Mechanic said it was leaking at the nipple of the heater core and had to bypass the heater core.
Anyone heard of something like this happening after only a couple years?
Any other options anyone can think of that can be done with the core still on the vehicle?
Even though the part is under warranty, it is a full day's labor to remove and replace and not sure if my dash will take another removal without cracking or breaking. 15 years old with the last 5 in Florida sun.

 

[bdcardinal]

Ya pretty common. Check the voltage of your coolant. We see a lot of heater cores of any brand go bad soon after install due to coolant contamination.

 

[AandPDan]

It can also happen from an improperly routed hose or a short hose putting stress on the nipple.

The engine can move in its mount.

 

[Chris142]

Originally Posted By: bdcardinal
Ya pretty common. Check the voltage of your coolant. We see a lot of heater cores of any brand go bad soon after install due to coolant contamination.
Bingo! Put one end of your test meter in the coolant and ground the other end. Anything over .3vDC will eat heaters and Radiators. I fight this daily and have yet to find a way of stopping the electrolosis in the cooling system.

 

[bdcardinal]

Originally Posted By: Chris142
Originally Posted By: bdcardinal
Ya pretty common. Check the voltage of your coolant. We see a lot of heater cores of any brand go bad soon after install due to coolant contamination.
Bingo! Put one end of your test meter in the coolant and ground the other end. Anything over .3vDC will eat heaters and Radiators. I fight this daily and have yet to find a way of stopping the electrolosis in the cooling system.


I have read a few dealers managed to do it, they replaced the engine, all hoses, heater core, radiator, and overflow bottle.

 

[bvance554]

Originally Posted By: bdcardinal
Originally Posted By: Chris142
Originally Posted By: bdcardinal
Ya pretty common. Check the voltage of your coolant. We see a lot of heater cores of any brand go bad soon after install due to coolant contamination.
Bingo! Put one end of your test meter in the coolant and ground the other end. Anything over .3vDC will eat heaters and Radiators. I fight this daily and have yet to find a way of stopping the electrolosis in the cooling system.


I have read a few dealers managed to do it, they replaced the engine, all hoses, heater core, radiator, and overflow bottle.


And that sounds practical...

 

[The Critic]

Originally Posted By: bvance554
Originally Posted By: bdcardinal
Originally Posted By: Chris142
Originally Posted By: bdcardinal
Ya pretty common. Check the voltage of your coolant. We see a lot of heater cores of any brand go bad soon after install due to coolant contamination.
Bingo! Put one end of your test meter in the coolant and ground the other end. Anything over .3vDC will eat heaters and Radiators. I fight this daily and have yet to find a way of stopping the electrolosis in the cooling system.


I have read a few dealers managed to do it, they replaced the engine, all hoses, heater core, radiator, and overflow bottle.


And that sounds practical...