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Old 02-15-2013, 09:11 PM
TMF Lindbeck TMF Lindbeck is offline
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Is there a vaccum operated shut off valve that blocks hot water from circulating in to the heater core when the heat is turned off? Some cars have them some don't. If you do it would be on the firewall and could be broken or disconnected causing low flow and in turn making your heater core useless.
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