You have to pull the dash almost out to replace the heater core. first drain the coolant and remove the heater hoses in the engine compartment. Next lower the steering column. there are 4-5 8mm screws onthe top of the dash,and tw 13mmbolts on the sides remove the kick panels to see them. Also remove the airbag module on the tranny hump under the dash.when all is unfastened you can pull the dash back on the passengers side back and almost put it on the seat. you will see the heater core on the top of the heater box. Discharge the ac and remove the heater box fasteners in the engine compartment . pull the box down inthe cab of the truck r&r core. sound worse thatn it really is good luck
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