hi friend,
Step
1
Inspect the thermostat. Consult your owner's or shop manual for the location of this component, because it is found in different places depending on the make, model, and year of the vehicle. To see if the thermostat is operating correctly, boil some water in a pot on the stove. Then, drop the thermostat in and watch for it to fully open. If it doesn't move, or only opens a tiny bit, it is likely the culprit and should be replaced immediately. A vehicle thermostat usually costs no more than ten dollars, so it is cheap insurance against future failure.
Step 2
Inspect the heater hoses. These are the two hoses that are connected to both the water pump and the firewall of the vehicle (toward the passenger compartment). To do this, simply look carefully over the entire surface of both hoses to ensure there are no cracks, bulges, or other deformities that would impede the flow of water. Heater hose is very cheap at the auto parts store, and to replace them only involves measuring for the amount needed, undoing the hose clamps at each end, and securing the new hoses into place using the same clamps. If the clamps look rusted or aged, it is recommended to replace them, as well.
Step 3
Check that the fluid level is topped off inside the radiator. Without coolant, the heater inside the vehicle cannot operate correctly, since it gets its heat from the fluid in the cooling system. Thus, if there isn't enough coolant in the radiator and engine, there may not be enough to flow around the entire cooling system, and it may skip the heater core altogether.
Step 4
Inspect the heater core. This component is usually found behind the dashboard on the passenger side of the vehicle. Many times, it is extremely hard to get at, and may require special tools to disassemble the dash in order to get to it. Once again, consult your owner's or shop manual for the location and removal process. Once the heater core is out of the vehicle, spray a good stream of water into one end with a garden hose, and see if it comes out the other end with similar force. If it just dribbles out, or you observe leaking from the tubes, the heater core must be repaired or replaced.
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Tips & Warnings
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Never work on a hot cooling system. Allow the car to cool for 30 minutes to an hour before performing any system checks.
References
hope this helps u
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sivaranjini
