Having problems with your 2009 Hummer H3T ?

Heater core removal procedure on 2009 hummer h3t

Posted / edited by AnonymousUser on : 23-05-2022

Answers :

Although I have never removed a heater core on that specific vehicle yet, I can give you some information that is common to most removal procedures.
The first thing that I usually do is to obtain the new part and check it for damage. If it is made of brass (most of them are) then check for cracks where the inlet and outlet tubes are brazed to the core.
If this checks out OK then, begin by draining the cooling system.
(there is an alternative method to draining the system, see below)
Locate the heater hoses and trace them back to the firewall. remove the hoses from the core once the coolant has been drained. If the hoses are going to be replaced then, remove the clamp and slice the top of the hose down the middle with a razor blade and peel the hoses off. If they are going to be reused then, use a small screw driver or hook tool to loosen the hose from the tube and carefully work the end of the hose back and forth until it comes off.
Removing the core itself is next up.
Removal tips :
find the location of the core inside the passenger compartment.
(removal of lower trim panel may be required) The core is usually inside what I call a "heater box". If it is then, the box must be removed.
Installation tips :
Once you have the old part removed then, compare it to the new one to make sure they are the same. Be very careful with the inlet and outlet tubes when installing them into position as they can be easily damaged.
Some heater cores are attached to the evaporator core with tie straps. These straps MUST be replaced when installing the new core.
System refill :
The system must be completely full of coolant and all the air removed in order to work properly. Some engines have air bleeds installed on the engine that must be opened with the engine running and then closed once coolant is coming out.
Drive the vehicle with the heater on high until warm air is noticed. Recheck coolant level after vehicle has sat overnight. Check for leaks.
Alternative procedure :
Instead of draining the coolant, use "pinch off" pliers on the hoses. The pliers allow the system to remain full while the work is being done. Although this procedure saves time, it can only be used if the hoses are being reused. Thanks for trying fixya.
Repair Help & Product Troubleshooting for 2009 Hummer H3T

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