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Discussion Starter #1
im trying to take the old one off but i cant diconnect the wires from the back of the heat & ac control device that needs to be changed becuase it dont work no more the heat wont come on just the ac can someone please help me?
 
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Mark the cables in case of doubt. You can use small pieces of masking tape and write letters or numbers or names or whatever you find fit to recognize their previous locations.
 

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Many GM cars use a double lock clip (top and bottom) to help prevent the harness from getting disconnected. You will need two flat blade screw drivers to get both locks undone. And you may want an extra person to help if possible. Some of these seems like you need 3 or 4 hands to do the job. If you try only prying on one clip you will not be able to disconnect the harness.
 
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