Hotter heater possible?

Some old cars just need part of the air to the radiator blocked off to make them run alittle hotter and make the heater hotter.We used to use a piece of cardboard in front of the radiator and behind the grill in the winter and take it back out when it warmed up.And make sure your control cable is moving the heater control all the way over.

One of my old dodges had the cable broken and I would pull the control on in winter and shut it back off when it warmed up.Like any 19 yearold would do back in the 70's ,budget fixes