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Here is something you can try before you remove it from the car, I have done this to a few with great success. Remove the hoses from the core. Put a hose on both fitting, one for filling, one for a vent and level indicator. Fill the heater core with CLR, a Calcium,lime, and rust remover you can purchase at most grocery or hardware stores, until you have go flow through the heater core. You can let it stand in the core for 2 minutes or so. CLR will dissolve the clogged tubes of build up of these impurities. When finish rinse all the CLR out of the core, making sure you have it all out. This may save you from replacing the core.

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15y ago

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