Water flow through heater core
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yachtmanbuttson (06-01-2018)
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I posted this question a while back. Lot's of good answers. search "coolant flow through the heater core? "
hopefully helpful
geneo
hopefully helpful
geneo
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yachtmanbuttson (06-01-2018)
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heater core using a cleaner and so far its working fine after 35 years.
Walter
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geneo (05-31-2018)
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After doing a bit of research I found out that with a GM TBI engine ,.. the coolant flows from radiator bottom hose through the water pump.. then through the engine,..under the TBI unit where some exits out of the heater hose connection (rear of intake manifold) goes into the heater valve ..through the heater core...out of heater core to radiator. Also the TBI intake manifold has the rear water port (head to manifold gasket) blocked off with restrictor plates. Not all SBC are the same. With the TBI engines the water pump does NOT flow coolant out of the water pump water fitting to the heater valve. Rather coolant travels through the engine and exits (some of it) from rear coolant outlet on manifold to heater valve through the heater core and drains forward through a long hose to empty into the radiator. The bulk of the coolant returns through the thermostat to the top of the radiator. Restrictor plates are critical. So SBC are not all the same - depends on application / year / vin number.
Last edited by alynmurray; 06-04-2018 at 01:43 PM.
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