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Old 11-17-2019, 09:16 PM   #15
FortyNiner
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Join Date: May 2012
Location: u-rah-rah-Wisconsin
Posts: 770
Default Re: 52 v8 flathead heater

The heater core is as complicated as a radiator - mainly because it is one. The valve, once open, doesn't have any further affect on the flow. Heater cores can get plugged over time. I would remove the heater and try to clean the innards. Vinegar would be worth a shot. A radiator repair shop can certainly help.
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