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A/C Hester Box Changes 83 VS 86

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10-31-2025, 01:14 AM	#1
aotte1 Senior Member Join Date: Oct 2013 Location: lousiville Ky Posts: 2,671	A/C Hester Box Changes 83 VS 86 What are the changes made to the 1986 A/C heater box under the dash Vs the 1983 box? Vacuum line diameter increase in size is one, others. Also, what are issues Iif installing a 1986 A/C under dash heater box in a 1983 truck?

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