Park your vehicle on a level surface and set the parking brake. Allow the engine to cool down before proceeding.
If applicable, verify that you have the radio security code before you disconnect the battery.
Open the hood and disconnect the negative battery cable. Wrap the cable end in a shop towel, and place it away from the battery post.
Loosen the radiator cap, and place a drain pan under the radiator drain plug or petcock. Remove the plug or open the petcock to drain the coolant.
Remove the glove box door or any related parts that are in front of the heater core.
Carefully remove any wiring connected to your heater core.
Mark the heater core hoses for installation reference. Remove the heater core hoses.
Remove the heater core from under the dash. Some cars will have the heater core fairly accessible under the glove box after it is removed. Other vehicles may require removing the instrument panel from the console of the dashboard and also the air compressor unit.
Install the new heater core and reconnect the heater core hoses. Carefully reconnect any wiring and install the related parts.
Re-install and tighten the radiator drain plug or petcock. Refill the radiator and the overflow reservoir with coolant.
Reconnect the negative battery cable and start the engine. With the radiator cap off, allow the engine to run for 10 to 15 minutes. Add coolant to your radiator if the level drops.
Re-install the radiator cap and check the cooling system for leaks.
Turn on the heater and verify a change in temperature.
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For more car related problem troubleshooting:---
This are the sections, you can go through and click the link to read its troubleshooting.
---------
The car will not start?
http://schematicsdiagram.blogspot.com/2011/06/car-will-not-start.html
-----------------
Car will not crank?
http://schematicsdiagram.blogspot.com/2011/06/car-will-not-crank.html
-----------
Car has no spark?
http://schematicsdiagram.blogspot.com/2011/06/car-has-no-spark.html
-------------
How to troubleshoot car battery?
http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-car-battery.html
-----------------
How to test starter solenoid?
http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html
--------------------
How to test cars starter?
http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html
How to replace starter in car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-starter-in-car.html
-----------
car will turn over but will not start?
http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html
-----------------
The Brake Indicator Light Stays On dash of car?
http://schematicsdiagram.blogspot.com/2011/06/brake-indicator-light-stays-on-dash-of.html
The ABS and Traction Control Lights stays ON dash of car?
http://schematicsdiagram.blogspot.com/2011/06/abs-and-traction-control-lights-stays.html
Check Engine Light On car?
http://schematicsdiagram.blogspot.com/2011/06/check-engine-light-on-car.html
-------------------------
How to replace Interior Lights on car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-interior-lights-on-car.html
Car lights not working, even after replacing the bulb/lamp?
Click this link below:--
http://schematicsdiagram.blogspot.com/2011/06/car-lights-not-working-even-after.html
---------------
How to replace head lights on car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-head-lights-on-car.html
--------------------
How to replace Parking, turn, and Brake Lights on car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-parking-turn-and-brake.html
How to remove the door panel on car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-remove-door-panel-on-car.html
How to replace power window motor in car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-power-window-motor-in.html
How to test relays on car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-test-relays-on-car.html
-----------------------------
How to troubleshoot Engine Misfires?
http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-engine-misfires.html
------------
The spark plug firing order for car?
http://schematicsdiagram.blogspot.com/2011/06/spark-plug-firing-order-for-car.html
------------------------
Where is the Thermostat located in car?
http://schematicsdiagram.blogspot.com/2011/06/where-is-thermostat-located-in-car.html
How to recharge AC on Auto/Truck/car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-recharge-ac-on-autotruckcar.html
-------------------
How to trouble shoot speedometer?
http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html
To Order car parts online:--To get heavy discount on car parts .Click this link below:----
http://technoanswers.blogspot.com/2011/05/from-where-to-order-car-parts-online.html
How to Replace Coil Springs?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-coil-springs.html
How to Replace an Oil Pan Gasket?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-oil-pan-gasket.html
How to Replace a Fuel Injector
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-injector.html
How to Replace a C.O.P. Type Ignition Coil?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-cop-type-ignition-coil.html
How to Replace a Fuel Pressure Regulator?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-pressure-regulator.html
How to Replace a Fuel Pump?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-pump.html
How to Replace a Rear Lift Gate Locking Mechanism?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-rear-lift-gate-locking.html
How to Clean a Fuel System
http://schematicsdiagram.blogspot.com/2011/07/how-to-clean-fuel-system.html
How to Replace an Ignition Coil
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-ignition-coil.html
How to Replace a Windshield
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-windshield.html
How to Replace a Mass Air Flow Sensor
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-mass-air-flow-sensor.html
How to Replace a Rear Distance Sensor
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-rear-distance-sensor.html
How to Replace a Muffler
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-muffler.html
How to Replace an Engine
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-engine.html
How to Replace an Intake Manifold Gasket
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-intake-manifold-gasket.html
How to Replace an Oil Pump
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-oil-pump.html
How to Lubricate a Brake Pedal Linkage ?
http://schematicsdiagram.blogspot.com/2011/07/how-to-lubricate-brake-pedal-linkage.html
How to Replace a Windshield Wiper Motor
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-windshield-wiper-motor.html
How to Replace a Distributor Cap
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-distributor-cap.html
How to Replace a Door Weather Stripping
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-door-weather-stripping.html
How to Replace a Freeze Plug
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-freeze-plug.html
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