Thanks for info I figured it got hot when saw the heat sink and thought it was a safety in case it got too hot. Now I know.
Saw some rust too. That from condensation as that unit goes from hot to cold in the winter OR from moisture pulled into the system as it is removed from the inside of the vehicle.
Which brings me to the question I have been pondering.
When some one says rhe A/C is an evaporative system I always thought that
it meant that the Freon or R134A is changed from a liguid to a gas.
And that evaporation is what makes it do what it does.
Then I heard because it is an evaporative system that it will take moisture out of the vehicle.
only way I could see the system taking moisture out of vehicle is..
The floor door opens so air in is being drawn from car. Recirulatting.
I thought some of that air was passed through the heater core to dry the air
And then back to A/C side and into the vehicle.
Is my thinking somewhat right or am I missing some law of phyics here?
Thanks and Good Luck