Quote:
Originally Posted by dhutton
Hi Ken. What is this box connected to the heater hoses? A bypass? Thanks.
Don
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The stock GM setup has the coolant flow continually running thru the heater core with the return line providing flow over the backside of the thermostat so it knows what the temp of the engine is..... with the Vintage air A/C in the car and the heater is off it shuts off the flow and the coolant isn't allowed to flow back across the heat sensing side of the thermostat ....... The block is a by-pass that allows that function to continue as per factory design........it still works without the block installed but it is thru convection rather than coolant flow as factory