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The common term used is Heater Core, not matrix. You change it by accessing it first which is the hard part. Changing it just involves draining the radiator and removing the inlet & outlet hoses, and then removing the heater core. The problem lies in getting to the core. All I can tell you is to remove enough parts to allow access. Be careful and do not break anything. Remember how you remove the parts and exactly where they go, so you can reinstall everything. A digital camera will come in handy, so you can take photos as you proceed. This is one of the hardest repairs to make on most vehicles, and that is why the labour costs are always expensive. Just find the inlet and outlet which will tell you the location of the core under the dash. Good luck.
You can't put a signature on the pantech matrix. Although, you can use a template everytime you text if you want. This will add a phrase or anything to the bottom of your text you are sending.
Bone maturing can depend on a range of things. It could be different with each person,. If they are not following doctors orders or if they have re injured the area, it will take longer for bone growth, Depending on the size of the bone can also change the time of growth. Smaller bones can take 3 months, where as bigger bones can take 6 to 9 months.