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Wow, thanks for all the replies. I'm probably going to have too read this thread a few more times, lots of great info. Just to clarify, the plane was a 1975 172M.

Good question, I believe it was broken on the previous flight. I pulled it out and did not feel anything break, it just pulled out a lot farther than normal and no change in RPM. So in this situation the carb heat could have actually been stuck on, not off like we presumed?

Hi, I am a student pilot with very low time. Today was my third flight and during the runup the carb heat knob pulled out much farther than normal and there was no drop in engine RPM indicating the linkage had broken or become disconnected. My instructor seemed OK to still fly the plane as it...