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When replacing the seals in the heater box, we first removed the case clips with a flat-blade screwdriver, as shown. Do this carefully because the case can be quite brittle, and you could snap the retaining lip off the box. External snap-ring pliers work even better.
Heater Core Replacement

When replacing the seals in the heater box, we first removed the case clips with a flat-blade screwdriver, as shown. Do this carefully because the case can be quite brittle, and you could snap the retaining lip off the box. External snap-ring pliers work even better.  View Related Article

 

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