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Have an 03 gmc 2500hd that ive been slowly rebuilding and just passed inspection it used to have service 4wd untill i cleaned up the driver side grounds and started to shift fine atleast long enough to pass, until today it shifted by itself into 4low by itself once i turned the truck on now it will not come out even in neutral tried going R-N-D-R-N...etc to kick it back on but no luck, confirmed it wasn't the 4x4 selector buttons, its not pulling any codes atleast on my scan tool. hitting up the junk yard tomorrow just going to grab a used tccm, actuator off the front diff and transfer case shift encoder since they are all super easy to pull and dirt cheap at my local junk yard and i have nothing but time at the moment. just wondering if any of you guys have had good/bad luck with any of those parts failing on you and causing the truck to get stuck into 4low/hi or the truck shifting into those selections by itself. and what your fixes and problems were. thanks guys!

Have an 03 gmc 2500hd that ive been slowly rebuilding and just passed inspection it used to have service 4wd untill i cleaned up the driver side grounds and started to shift fine atleast long enough to pass, until today it shifted by itself into 4low by itself once i turned the truck on now it will not come out even in neutral tried going R-N-D-R-N...etc to kick it back on but no luck, confirmed it wasn't the 4x4 selector buttons, its not pulling any codes at least on my scan tool. hitting up the junk yard tomorrow just going to grab a used tccm, actuator off the front diff and transfer case shift encoder since they are all super easy to pull and dirt cheap at my local junk yard and i have nothing but time at the moment. just wondering if any of you guys have had good/bad luck with any of those parts failing on you and causing the truck to get stuck into 4low/hi or the truck shifting into those selections by itself. and what your fixes and problems were. thanks guys!

My 2003 Silverado 5.3 is blowing cold air through the passenger vents but hot air through the driver side. I replaced the blend door actuator in hopes that the manual climate control had gone and that’s why drivers side was only blowing hot but the Dorman actuator from O’Reilly’s didn’t solve the problem. Any and all suggestions are appreciated it’s starting to get hot in Vegas!

Hi all, my 2016 1500 chevy silverado lt had 3 door lock actuators were inoperable or making noise. Common issue,ordered 4 new lock acuators from Gruven parts and put 3 in. They work great but noticed drivers door when opening or closing will not turn on or turn off interior lights and also radio stays on when closing door. Sounds like a bad door switch to me which is in the latch I believe. Thinking I caused the problem since it worked fine before. Went back in the latch and all looks fine. Was hoping to see a gear out of place or something, but looks ok. Anyone have some insight on this. Maybe a door schematic you can share to check the wiring. Thank you in advance

My AC only blows cold on the driver's side. The passenger kicks out some heat. Here's where I am so far: I noticed no movement from the passenger side actuator. I recalibrated the system, no improvement. Went ahead and replaced the passenger side door blend actuator. That was not fun to say the least. Did it by removing the passenger side airbag, vent and dropped the glovebox. That didn't fix it. I noticed however that the white dial went from the center position to the right. It seems to be stuck there no matter what I do with the climate control dial. I recalibrated the system again and nothing. I'm at a loss with what to do next. Could the terminal cable be bad? I'm not sure where those wires lead. Any guidance is appreciated. I bought the new actuator from Oreilly. They had a 65 dollar one and a 140 dollar version, both from Dorman. The salesman could not tell any difference between the two, so I opted for the 65 dollar one. The terminal connection was exactly the same on both. A mystery to me. I hope to god that one is correct and the other isn't. One more thing to note...When I bought the truck used, the air blew cold on both sides (Florida purchase). When I got it up to Atlanta, there was not heat. I took it to a mechanic who discovered the heater core was disconnected (bypassed). We went ahead and connected it to see if it leaked. No leaks. So we just hooked it back up. Heat worked great. The passenger AC, as noted, stopped working. Perhaps there's a connection there. The truck has 80k miles and is a V6. Thank you.

When I’m running my heater, the mode changes on its own (Defrost, to vent). They said it was a short, and a solenoid needs to be replaced. I can’t find any information for the mode actuator, or solenoid. Everything is about the blend actuator, which is different. I’m looking for part numbers and schematics, or better yet, video on how to fix this. They wanted $230 to fix it, but I’m handy enough. Thanks in advance!!