I should have read some of the previous posts on this subject before jumping in with my questions so quickly! I realize now that its the mono valve that controls flow of coolant to heater core. Evidently, something happened when I decelerated to cause mono valve to loose elec. power and open fully, allowing heater core to suddenly fill with very hot coolant. Valve is still open.
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Wilton Strickland
Goldsboro, NC
91 350 SDL. 81 300D
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