Spray doesn’t work on my Bissell Proheat 2x 8920 took apart but couldn’t find where the heater is

\015 Spray doesn't work. Saw online that it might be the heater just open it up and clean it out. I took the machine apart but couldn't find the heater. Unless it is underneath the shampoo tank in back. Frustrated took so long to take apart!!\015 – Bissell Brushroll Proheat 2X 8920 9200 9400