Scotty, I’m a long time viewer of your great content.  You’ve taught me a lot, but this is the first time asking a question.

I acquired my 94 year old grandfathers old 2000 Chevy S10 (Standard cab Automatic 4.3 V6 4x4) a few months back and loved it so much I decided to make it my primary vehicle. Overall it’s in great shape and he was the only owner. It became his secondary vehicle by 2007 or 2008 and as he has gotten older it’s been driven less and less.  Not to mention the last few years the man never used A/C even in the hottest of summer. 

Of course right after I decided to sell my trusty old Honda Accord in favor of this old truck, I noticed the A/C compressor stopped kicking on when using the defrost. I’ve done some typical diagnostics and the A/C compressor does work.  Bypassing the relay with a paper clip does the trick every time and results in nice cold A/C. I did check the refrigerant and added a little but that is not the issue.  I also saw some guides suggesting unplugging the low pressure switch and bypass at the connector there with a paper clip.  When doing that, I am unable to get the A/C clutch to engage so I suspect a wiring issue or maybe even an issue with the control knobs in the truck.  A quick visual inspection from an uneducated want to be DIY mechanic like myself and I don’t notice any obvious wiring issues but I suspect there is a better way to test properly with a multimeter. Or maybe I’m barking up the wrong tree and there is something else more obvious to check.

Looking for any advice on what to check.  The Nashville, TN area spring is coming fast and my wife is pretty upset with me for getting rid of my Honda in favor of this old truck. 😆    I know my kids aren’t going to be too happy if they get stuck riding with me as it warms up either.  Help me save my marriage and relationship with my kids. (I’m kidding about that part!)

I’m hoping to avoid taking this old vehicle to a mechanic, especially in the overpriced area I live in.

Thank You for reading!