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If your pony has underdash air like this one, you will need to pull it out of the way for easier access to the heater box. The 1966 has two bolts--one per side.
Heater Core Replacement

 If your pony has underdash air like this one, you will need to pull it out of the way for easier access to the heater box. The 1966 has two bolts--one per side.  View Related Article

 

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