Last week, my wife was operating the heater at approx. 76 degrees which normally warmed the cabin of the Suburban sufficiently. Returning home from work on Monday of this week, she suddenly detected a strong odor of antifreeze and then the warm air from the heater changed to cool air. Since that time, we have had to increase the heater temp to 84 degrees to be able to get the heater to discharge warm air.
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the oil level and the first thing in color is normal. Normal oil is
usually shades of brown to black in color. If the oil is white or
gray color is your car to the failure of more than initially seemed
to have happened. This means that the block head gasket is damaged.
When the oil is decent, and then check the oil level is the norm
following. Is the coolant level is normal. CAUTION not to check at a
time when the engine is warm or hot. If you find that the coolant
level is low, add it. If coolant levels are normal, check whether the
car interior heater blowing hot air or not. If you do not blow hot
air then it is probably the air inside the cooling system. The system
should be discharged from the air. However, if the cabin heater blows
hot air then you should definitely check the thermostat. Each car has
a sort of thermostat to be tested, and they differ in the parish. If
you still have not solved the overheating problem, described the
situation may have a defective cooling fan or a cooling radiator for
the accuracy of work capacity. Definitely happy to answer all your
questions. Please note that cold weather is had different error
character. In this case, please consult with experts before.
heater hoses run from the rear of the block to the water pump. One hose into the heater should be hotter than the other because heat is transferred in the heater in the car. . The cooling system draws water from the bottom of the radiator ( water pump inlet)which is always cooler than the top hose and dispenses it throughout the engine and heads including the heater core. It is then pushed past the thermostat with all the heat from the engine to the top of the radiator where it is cooled down by the air passing through the radiator . Check that the air vent for the cabin is set to recirculated cabin air and not fresh air from the outside as it will require recirculated air to increase in temperature to work properly
its VERY likely that your heater core is getting stopped up.
The heater in your car works by circulating hot water from the engine into a copper or aluminum pipe coiled up in the dashboard. The heater/airconditioner's fan blows across it and the hot air comes out of the vents. This is why the heater doesn't work right away when you first start the car. It usually won't work until the hot/cold needle in the gauges is starting to rise up.
If your mechanic recently replaced the thermostat, its possible that there is air in the system which will result in less antifreeze in the car than it should be. If this is not the case, the heater core is probably stopping up and will require expensive replacement if it cannot be flushed clean.
Check to make sure the car is full of antifreeze IN THE RADIATOR, AND THE OVERFLOW JUG. Please be very sure there is NO AIR in the cooling system as well.
If your temp is jumping between 150-200 degrees then I am guessing you have an air pocket in the engine where coolant should be. The air pocket moves through the engine and when it gets to the water pump, it looses prime and doesn't move the antifreeze which causes it to warm up. Take the radiator cap off the radiator when the engine is cool. Start up the engine and let it run until the thermostat opens up. As the air moves it's way to the radiator it will escape and you will see the antifreeze level go down. Watch it run and as the level goes down add antifreeze until the radiator remains full. Then make sure your overflow tank is up to the required level and I bet your heater works a lot better after that.
First, check to make sure you are not low on coolant. Check hoses going to heater and see if they are getting hot.(one should be hot, the other should be slightly less hot but not cold or just warm) Check heater control valve to make sure that it is operating, Check that plenum door is opening properly inside the cabin, in the heater box. If you have done any work at all on cooling system, run the engine 'till it reaches operating temp with radiator cap off...sometimes htr core can become air-bound. Also...goes without saying, but make sure that engine reaches normal operating temp while driving. If not check thermostat!