When there is no more hot water circulating through the radiator or no more dirty coolant in the system, this process will not work anymore because there are no significant temperature differences between incoming and outgoing flow. this can happen due to boiling coolant, low fluid levels in either radiator or heater core/blower motor wiring malfunctioning/exploded hoses for example. any one of these issues can lead to all sorts of problems with blower operation including what you're describing.
why is my car ac blowing out warm air?
a blown-out ac system is a complex system issue and may have a variety of possible causes. part of the answer to this question needs to include some important information on how your ac system works, mechanical or refrigeration knowledge on why warm air is being pushed through, and what might be done for repairs.
the technical definition of “blowing out” is when the refrigerant leaks from the vehicle into the atmosphere before it can cool anything. so an air conditioning system that's blowing out will have only hot air coming from its vents, but if there are no significant leaks in its outdoor condenser coils, then something more serious could still be going wrong with it internally. plus a burned thermal protector could cause a pulsating compressor
why is my car air conditioner not blowing cold air?
it's important to have your coolant and refrigerant levels checked before coming to a conclusion. air conditioners rely on the water-filled evaporator for cooling, so if either of these fail or are not doing their job then this will result in the ac being less effective. be sure to closely inspect your engine around the area where the a/c lines come out from it for any crusting or leaks on surface areas about 1ft away from where they enter into the carbumper side panels, as well as checking all vacuum lines near vacuum actuators down by your feet while driving on bumpy roads.
how do i fix my ac from blowing hot air?
the most likely problem is that air cannot reach the coolant coils because of a clog. make sure to clean the condensate drain tube and check for leaves, which also can affect performance and efficiency and may cause it to overheat. leaks in the insulation or sealant on seams can lose cooling by up to 85%. torn or missing insulation can be fixed with self-adhesive ez cool polyurethane foam, which you spray onto exposed areas of your home's interior surfaces such as walls, ceilings, floors and pipes.