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.
Sounds Like Your Head Gasket Smoke Is Cause By Oil In The Fuel. You Can Try Buying Some Head Gasket Repair Solution From Your Local Auto Part Store And Put It In Your Oil.
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This is caused by worn valve guides/ seals. Mine has been doing this for years. Not a problem. When the engine sits over night, oil will run down the stem and when you start it in the AM the oil on the top of the piston will burn off. I still only use 1/2 qt. oil between oil changes and with 230,000 miles, it is still running great.
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