Heater core failure

A major cause of heater core failure is electrolysis, a process of chemical changes in the cooling system, by the passage of an electrical current through the engine coolant. Chemical changes can ionize the system and can cause metal to be removed from the heater core and be deposited to other metals in the system. What is the condition of the coolant?

The PH should be checked prior to making the repair.

There are several commercial testing systems available.

We do hear more about Ford repeat failures, we suspect, because of an old Ford service bulletin .

Heater Core Failures and Replacement.

Learn about how wet carpet and the. Experiencing something with your vehicle that makes you suspect your heater core may be failing ? Because it occurred more that 12K miles after the first repair, it was not covered by our warranty. Four months after it was last replace the heater core has failed again.

In some cases, a heater core will fail from the inside out due to erosion rather than electrolysis. The heater core is most vulnerable to dirty coolant because the tubes in the core have sharp bends. I love the video, very professional and informative.

The heater control valve is typically mounted near the firewall, and acts as the valve that allows coolant to flow from the engine to the heater core , which is located inside of the . Due to the fact that heater cores are essentially small radiators, they fail for all the same reasons that radiators do. Excessive pressure in the cooling system can cause leakage, as can electrolysis and corrosion. However, the fact that most heater cores are located inside the passenger . Volvo started use plastic and aluminum heater cores in the 8and newer models.

These cores are prone to leaking where the glue or seals fail where the plastic meets the aluminum.

It would seem logical that repeated expansion and contraction of the plastic would cause seal failure long before the core . This is what happened when the heater core failed in my E34. NOT losing coolant when the heater is NOT used. In theory your fix should not harm anything.

Jeep and just Chrysler in general have issues with HVAC quite frequently.