How to Stop Drafts

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I have a 1942 1.5 story Cape Cod style home with forced air. My cold air return vents all run on the exterior walls of my house. Since the weather has gotten cold I have noticed that I am getting a lot of cold air and drafts coming from the returns when my heat is not on. I have taken the return covers off and can see the old wood siding on the exterior of my house. Is there a way that I can insulate the vents or seal them up, so that I don’t get those drafts? Also if it matters I just had a new 96 furnace installed over the summer. Thanks, Jake