Mooney_Driver wrote: Carb Heat on all the time? No. When inside cloud or any conditions with suspected icing conditions, I will (or rather have the student) operate the carb heat from time to time. What “from time to time” is depends on the conditions. Maybe every 5 minutes, maybe every 15 minutes. On the Pa44 almost never. Look at RPM and MP before operating carb heat, wait for a minute,...