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#18
05-13-2026, 04:03 PM
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If you have an older (or original) heater core, you'll see that the end of the 5/8" hose nipple is "crimped" which acts as a restrictor. New heater cores haven't had this feature for many years. You should probably run a restrictor with a new heater core. A piece of 5/8" OD teflon round stock with a 1/4" hole worked for me.
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