if your vehicle has air conditioning the smell could be caused by build up of bacteria on the heater matrix and in the vents, as this bacteria decays it causes a smell inside the cabin, this can be resolved by purchasing air specialist air con cleaner the is sprayed into the sir vents. the smell can also be caused by the heating of leaking coolant from the heater matrix, this would also combined with the car steaming up, check the coolant level to see if it has dropped.
Ventilation filter: 1 - Behind glove compartment 2 - Behind lower instrument panel. 3 - It's clipped in. 4 - Remove lower filter, slide down upper filter, remove ventilation air filter. 6 - Replace and put clip back on.
Bad heater core.
There are heater doors on the heat blower box that direct the path of the heat. Apparently the heater door to the floor vents is stuck closed.
Is it a fish smell or a rotten egg smell ? FISH SMELL COULD BE A BAD HEATER CORE, THIS WOULD CAUSE YOU NOT TO HAVE HEAT IN THE CAR , BUT IT MIGHT NOT CAUSE CHECK ENGINE LIGHT TO COME ON UNLESS MAYBE CAR IS LOW ON COOLANT. ( THERE MIGHT BE A LOW COOLANT SENSOR TO TRIGGER CHECK ENGINE LIGHT) ROTTEN EGG SMELL COULD BE A CLOGGED CATALYTIC CONVERTER , WHICH WOULD CAUSE THE OXYGEN SENSOR TO TRIGGER THE CHECK ENGINE LIGHT, BUT IT WOULDN'T CAUSE THE LOSS OF HEAT.
The heater core has failed.
Could be that your heater core is leaking May also have a plugged evaporator hole.
The possible explanation for the smell may be that the heater core in the vehicle has a slight leak, therefore the smell of evaporating antifreeze will come through the vents until it is all dried up. Solution is to take the car to a garage and get the heater core replaced.
Fuel Leak. Possibly the Fuel Pump. Get it checked immediately.
I just had that problem with my 99 Monte Carlo. When I accelerated or went uphill No air would come out of the dash vents. Problem was a Vacuum hose. Cost about $40 to fix.
Check the Heater Core? Did it smell like oil or antifreeze. My Heater Core went, started blowing out smoke from the vent. Most Likely the Problem. "smoke" poured into my 1991 when the ac blew out all the freon and froze up the outside temp gage.
The smell is not dangerous - however, if there is still a smell, there could still be urine, which could cause diseases and infections if you come in contact with it.
Heat and steam coming from the dash and air vents after replacing the water pump means that a hose is hooked up backwards in the new installation. The heater is actually taking on water when it is supposed to only take on hot air.
Ammonia smell after exercise, especially on ahot day, may come from your Kidneys which produce it in order to keep your body PH level in check. It comes from dehydration, so I suggest to drink more fluids!!
Yes, gnats can come out of dirty air vents. Gnats can actually come from anywhere. They are very pesky creatures.
Is it smoke or is it atomized freon leaking from the AC system? If it fogs the windshield and smells funny, you may have a leak in the AC/Heater system.
If that smoke is more like steam, you have a leaky heater core.
your car is burning oil.
There may be a person that has a reason to retaliate with you!!! They put urine in the air intake of the blower motor. Depending on type of vehicle, it may be cheaper to junk and get new car then replace dash. Don't mess with people that handle your food and vehicle!
There is probably a fuel leak somewhere. You should have a professional check it out ASAP. There is a possibility of a fire if left alone.
Hey Brad==That is where it is suppoaed to come from. Incidentally, what kind of car do you have?? Goodluck, Joe
There are several different types of heat vents. Vents come in metals such as aluminum, copper, stainless steel, bronze, and brass.
heater fan broken.
The blower resister is not supposed to be grounded. The smoke may be steam from a leaky heater core.
The smoke you see may be moisture/steam. The heater core is probably leaking engine coolant. If the "smoke" has a sweet smell to it, it's engine coolant. More info about the vehicle such as model and year would help.
You probably have wires that are burning. You should have the vehicle repaired by a professional before you have a breakdown or a fire.
SOUNDS LIKE THE INTAKE GASKET BLEW, OR THE HEATER CORE FAILED.. EITHER WAY, THIS IS A COSTLY REPAIR.