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Based on the limited information you gave, it appears as if your heater core is going out. If you live in a climate where it is cold and snowing and use the heater regularly, and also if the car is an older model, there is a great chance your heater core went out. The water runs through the heater core and through a process of convection, the heat from the warm water from the engine is extracted from the water a blown into your heater vents. When the core goes out, a hole forms, the heated water that runs through the heater core now leaks out and runs into your heat vent, and eventually on the floor in your car. The core is located under the dash board, and the whole dash will need to come out to repair it. Usually a costly job, as most vehicle manufacturers list the job as an 8 to 10 hour job. The air conditioner unit usually needs to come out also because it is a part of the heating/cooling system, so after the job is completed, your air conditioner will need recharged with Freon as well.
This can be a few things, for starters most common in my experience is when you have air bubbles in the coolant system (Mostly when its been recently drained or flushed) You will have no heat. Also, if your heater core has failed (in most cases water will leak from under your dash) you will loose heat and your vehicle will most likely overheat. Last but certainly not least, a failing head gasket could cause combustion to leak into your coolant system causing air bubbles which could make your heater not work which could also cause overheating in further along failing head gaskets. Things to check would be a leaking heater core under the dash, overheating, check engine lights and bleeding the coolant system.
the temp control on your dash operates a hot water valve under hood, it's probably vacuum aparated, like the doors in the heater housing, the valve may be close to heater core,check for vacuum leaks around dash control, totally unrelated leaks can cause problems, and yes a blocked heater core can definitly cause the problem,but I would save that unless it's easy to get at, eliminate other stuff first, luck
If you are not the original owner, the previous owner may have bypassed the heater core. The heater core is like a small radiator that has hot water running through it from your motor. It is inside of your dash board, near your a/c and heater controls. That is how yur car gets hot air. The air runs through the heater core making it hot. Bypassing it is a cheap and quick fix for a leaking heater core. When they get a leak, they leak all inside the car down to the floor board. Check under the hood along the fire wall. If it is bypassed, you will see two hoses spliced together. One will be bigger that the other slightly. If this is your problem, you are more thatn likely need to replace your heater core
If you're not losing coolant, it's much more likely to be the water pump. Most heater cores leak when they go so although it's not impossible, I'd be very surprised if the heater core was even partly to blame for your overheating problem.
You can bypass the core or fix it that's up to you but I would change or remove the thermostat first. If it still overheats then start looking at the water pump and radiator. Hope this helps. Good luck.
these guys are retarded, could be the fuse, could be the relay, could be the fan control unit, could be the resistor, could be the fan motor itself. if the heater core was leaking, you would still have heat, you would just smell coolant, if it was leaking enough to not have heat you would see it on your floorboard.