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Old 09-09-2017, 07:44 PM   #5
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Join Date: Mar 2012
Location: Lakes Region NH
Posts: 2,212
Re: 56 truck heater hose routing - overheating

You have the connections reversed according to the factory instructions but I wouldn't expect that to make a difference. If you wanted to check that the core is the problem you could bypass it completely.

Instructions for the deluxe heater insallation are here and the recirculating heater is here.
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