No heat 94 RMW Lt1 Had new heater core and radiator and new coolant last year

Bob 94 RMW

94 Roadmaster Wagon
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Buick Ownership
1994 Buick Roadmaster Wagon
I have a 94 RMW Lt1 Had new heater core and radiator and new coolant last year.
Worked good to ok last winter, and already I'm not getting any heat.
Wondering if it is maybe the digital electronic controls that is the problem.

Anyone else having issues like this?
 
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