How to Remove a Hummer H2 Heater Core

by Bryan Clark
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The heater core is part of the overall heating and air conditioning system. Over time, the heater core may stop functioning properly, especially if there is a leak in your system and dirt has entered it. You can remove the heater core assembly on your own, but you will have to call a licensed technician to discharge your AC system in your H2 first. This is a large job that requires the removal of many of the largest parts of your vehicle. Be sure that you have ample time to complete the task.

Step 1

Remove the passenger's side front dash unit. Use a flat plastic tool to pry it off starting on one end and working your way to the other. Remove it from the vehicle.

Step 2

Slide your front passenger seat back. Remove the four bolts that secure the seat to the floor, using the appropriate socket. Remove the seat from the vehicle.

Step 3

Remove the trim pieces near the front passenger's foot area by prying off the clips on the outer edges. Gently pull them away and remove them from the vehicle.

Step 4

Open your hood and disconnect the negative terminal of your battery.

Step 5

Place a large collection bin under your radiator. Drain the coolant from your radiator by loosening the plug at the bottom of it.

Step 6

Call a licensed technician and have your AC system discharged. DO NOT attempt this on your own. The chemicals within the system are dangerous to your health.

Step 7

Remove the air intake in the top left portion of the hood by removing the screws that secure it with the screwdriver.

Step 8

Locate the three bolts that have been exposed under the air intake. Loosen them with the appropriate socket, but do not remove them completely.

Step 9

Remove the coolant overflow container by removing the three nuts that secure it.

Step 10

Disconnect the coolant and Freon lines from your AC system by loosening the clamps that secure the hoses. You must keep these lines very clean. Plug them with something to ensure no dirt enters them while you work.

Step 11

Locate the blower unit from the inside passenger's seat. Disconnect the harnesses that are connected to it by pressing in on the release tab.

Step 12

Remove the blower and defrost diverter by removing the screws that secure it.

Step 13

Disconnect the vent and drain lines that are connected at the floor by loosening the clamps that secure them.

Step 14

Go back under where the air intake was and remove the three bolts that you loosened. The unit is now free.

Step 15

Remove the heater core from the vehicle. You may have to use some force to make it budge from its position.

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