1992 GMC Yukon Questions

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Both my front speakers are not working. I understand that there is a speaker relay somewhere on the vehicle but I cannot for the life of me find it. I was able to purchase one in the hopes that I could see it but stil...
My 92 Yukon runs well but only after I disconnect the battery and reset the codes. Once i reset the codes it will start and run fine until I turn it off. Then I get an low buzzing sound and no dash lights or anything....
I have a 92 youkon and the flywheel is broke but i need to know what type of transmission i have so i can fix the problem.
I have been told that there is a coil that needs to be cleaned in order for the air conditioner to blow cold air. Any idea where it is located and how I get to it?
Is there a heater water control valve and how do I replace/check it? Where is it?