Don't Go in the House (1980) on Netflix

At the sanitation incinerators where he works, Donny Kohler (Dan Grimaldi) watches as an industrial fire consumes his co-worker Ben after an aerosol can passed unnoticed into the incinerator and explodes. As Donny puts his tools away, Vito (Bill Ricci), his supervisor, yells that Ben almost died because of Donny's failure to act. Bobby Tuttle (Robert Osth), another friend from work, persuades Donny not to dwell on Vito's criticism. As Donny drives home in his beat-up pickup truck, he hears whispering voices in his head.