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Old 01-15-2013, 01:30 PM   #9
Classic Heartbeat
Project Junkie! Fishing Poor!!
 
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Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,766
Re: 1972 Chevy C10 - Heater Core

There are 4 bolts that pass through the firewall and the outer housing on an A/C Truck. You have to take those loose from the engine side. You also will have to remove the A/C duct selector from the inside. It is the one mounted to the heater core housing. Then unplug the wires to the high speed fan relay and the resister inside the housing. Then you should be able to pull it to change the core. A/C trucks are different than non A/C trucks. WES
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