We study the electronic transport through a quantum wire (QW), modeled by a tight-binding linear chain, with a side-coupled quantum dot (QD). We obtain the conductance with a strong Fano antiresonance. The calculated density of states shows that this behavior is associated to a many-body renormalized QD resonant level $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{{E}_{f}}$ at the edge of the conduction band (CB) strongly hybridized with the Van Hove singularity of the one-dimensional density of states of the lead. Different from the Fano antiresonances experimentally found when this system is at the Kondo regime, this phenomenon appears above the Kondo temperature. It is due to the quantum interference between the ballistic channel and a thermal activated channel created by the QD resonance at the vicinity of the bottom of the CB.