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Looks like the original A/C water control valve was removed. Would help to know what year and model car. 318 means nothing. Someone added it. Most likely to keep all the hot water out of the core in the hot summer months.
Looks like the original A/C water control valve was removed. Would help to know what year and model car. 318 means nothing. Someone added it. Most likely to keep all the hot water out of the core in the hot summer months.
Water control valve is removed, so no way to keep hot water out of the heater core. Makes for a miserable summer as that valve is what shuts the hot water off when the heater control is off. Therefore someone installed a manual shut off.