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 still cannot find where this relay is located. HELLLLLLLLP!

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 already replaced the ECM and installed my original POM into the new ECM before installation because of this same problem. Any Ideas as to what else could be causing this?

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?