Hi. There are two possibilities causing this problem,if your car is A/C equipped,there is usually a diverter door that is operated by a vacuum motor or diaghram,vacuum is switched by heater or A/C control,another possibility is outside air is usually ducted in from an opening under the lowest part of windshield,make sure this is not blocked,last,on vehicles with high milage,gum from antifreeze lines heater core passages causing little or no heat exchange,more than 90% of the time this is cured by disconnecting both input and output water hoses from heater core and using an air gun giving a good air blast to water ducts,if this does not work make sure engine water temp is adquate,a motor block reverse flush may be necessary,Good Luck.
If a 2000 Grand Am sometimes has the heater blower working and sometimes it won't, the problem could be with the heater relay switch. The heater relay switch lets the heater blower know when to come on and when to go off. In most vehicles this switch is behind the glove compartment. This part sometimes gets corroded from condensation in this area.
Sounds like your blend door may be broken. the blend door opens and closes on the heater core to allow heat into the cab by letting the air blow over the heater core. The heater core basically looks like a small radiator and when the blend door gets opened up, it allows to air from the blower motor to blow through the heater core fins and that heats the air before it is pushed out the vents into the cab... Check out www.heatertreater.net Those guys have videos on there of what I am talking about. It may not be your blend door though. Could also be the blend door motor or the dial to turn from cold to hot... I would check that blend door first though...
The same thing happened to mine with the blower motor. The blower motor is run by 3 resistors and a relay. the first 3 speeds are controlled by the resistors and then when it gets switched to high the relay is energized and it puts full power to the blower motor. The problem is that the relay is stuck in the on position. When it finally does "burn out" you will no longer have the high speed on the blower. The relay and resistor unit is located on the heater box just under the blower motor under the hood. To get at it you have to take out the washer fluid and antifreeze reservoir. It is best to do this with the reservoirs empty. The new assembly is about $70. It is a pain to put in as you may have to cut a new sized hole in the heater box. A template comes with the new unit. As for shifting. Your foot must be on the brake. If you are parked on a hill it can also jam you in park. If you are on a hill try shoving the vehicle up the hill a bit and getting it out of park. Not sure if this is your problem or not.
The blower motor gets its power through a relay, and it is not unheard of for contacts of relays to stick together after they are de-energized. As well the (BCM) Body Control Module receives its blower operation signals via the heater control switches, and it energizes that relay. There are so many might be's. There are so many relays and modules in these newer vehicles that it takes an active mind to keep them separated as to which does what. Since the blower continues to run, and the blower relay contacts have an unswitched electrical connection straight from the fuse box, you might have a sticking relay. The heater relay is in the engine compartment fuse box, near the battery and washer fluid container. Something funny that I have done a few times, is that I thought the heater fan was running, but it was actually the engine cooling fans that were running. They are meant to run as long as the engine heat calls for it, Ignition on or not.
The engine needs to be hot in order for you to get got air. On a cold morning, even if you let your truck run for a while, will not get hot enough to blow hot air usually until you drive it for a little bit. When it gets at or near operating temperature there is no reason that it shouldn't blow hot air.
That is probably antifreeze steam. Your heater core is a small radiator used to heat your car. The engine heats the antifreeze and circulates it through the heater core. Your blower blows heat through the core (radiator) into the car, and warms you. If the core gets a small leak, it will put out steam.
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