 So the blend door now, which is the door that controls how much heat and cold blends together, will open and give a little bit of heat to warm it back up to where you want it to be. You do not have to touch the system. It will not work any better. It will not work any faster. It will not work any slower. In fact, if you fiddle around with it, you're probably going to make it work slower because you're overriding heat.