My heater is not blowing hot air. I have changed the thermestate. My heater core is not leaking because, there is anterfrize still in the raditior. can someone get back with me on the problem,. Someone told me that the door that opens to let cold and or hot air through is stuck in the middle to where it is onle cold air blowing out
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Re: heater not working
Try flushing out your heater core. sometimes it gets a scale build up and restrickes the flow thru it. what i do is remove both heater hoses to heater core and mix up some water and baking soda and pour it in the heater core and let it set for about a half hour then flush. you might also want to blow the antifreeze out of core be fore you do this as so you get enought of the solution in it. just make sure you flush it out both ways. use a garden hose for this. it makes a mess. but it could be a cheap fix. good luck.
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Check both hoses to heater core and see if they are both hot. If not, try back-flushing heater core. If the are both hot, you may have an air"blend" door not working due to bad actuator or vacuum leak. This is the door which changes hot the air flows into the heater core or not.
sounds to me the hissing is the sound of a leaking heater core. Its smells weird becuse coolent usually has a sweet smell that is very noticeable. I bet the floor is wet/carpet damp in the front near the hissing. I bet your coolent level is low as well. Replace heater core.
To clarify - - if the truck has rear and heat, you have two heater cores and two evaporator cores. The evap cores carry the freon. If the leak is in the evap core in the front, the price is probably right.
You will have an 'in' and an 'out' hose going to the heater core. Run engine until hot, these two pipe should be both quite hot, if the out pipe feels cooler than the in pipe then it would seem the core is blocked. You say you have no leaks so maybe it would be worth removing both heater pipes, fix one side up to the water main and gently pass water through it. Hopefully lots of Brown sludge should come out.
If both pipes feel hot then the core should be ok. This means it will be an air-distribution fault and maybe the flap is stuck that changes it from hot to cold air.
The only reason it won't blow hot air is because the water is not getting to the heater core. Check to see if you have a heater control valve in one of the two lines to the heater core. If so check to be sure that is is opening and closing. If it won't open then you get no water flow in to the heater core.
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.