How To Replace A Heater Core In A 2005 Trailblazer?


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Anonymous answered
Things that you will need:

Needle Nose Pliers  Combination Wrench Set
Socket and Ratchet Set
New Heater Core

Here are the steps that you need to follow. Hope it will help.

1.Disconnect the vehicle’s negative battery terminal
2. Place a drain pan under the radiator and remove the lower radiator hose to drain the cooling system
3.Remove the glove box door or any related parts that are in front of the heater core
4.Pull back any wiring that is running in front of the heater core
5.Remove the heater core and the heater core hoses.
6.Install the new heater core and heater core hoses and re-install all items removed in reverse order.
7.Reinstall lower radiator hose. Refill radiator with a coolant.
8.Fill overflow reservoir with same coolant.
9.Pressure test the cooling system and check for any leaks.
10.Install radiator cap.
11.Start the engine and check for any leaks while turning the temperature from cold to hot. Change in temperature verifies the repair is complete.

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