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Heater core flush

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Old Aug 8, 2022
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Heater core flush
Dumbass question:
If I want to back flush the heater core, how do I know which is the send and which is the return?
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Old Aug 9, 2022
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Re: Heater core flush
The input side has an inline valve mounted to the firewall.
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Old Aug 9, 2022
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Re: Heater core flush
Got it. Thank you
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