The aim of the present study is to examine the effects of integrating Content and Language Integrated Learning (CLIL) on the motivation of students learning English in a preparatory school at a private university in Istanbul, Turkey. The study also attempts to find out how the students and their instructor perceive teaching and learning English through this particular approach. The participants consisted of 19 intermediate level students and their instructor. To meet these objectives, the quantitative data were collected through pre- and post-motivation questionnaires whereas the qualitative data came from reflective journals kept by the two CLIL had a positive influence on the students' motivation while learning English. In addition, the reflective journals suggested that both students and their instructor perceived CLIL as an engaging and functional instructional tool while teaching and learning English. CLIL also helped students to become more responsible for their own learning process. Finally, the two groups of participants shared the difficulties they experienced with this approach, such as timing, workload and speaking. Based on these findings, the study offers recommendations and implications about using CLIL in English classrooms.