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Fixed!!! OK, I replaced the actuator and FINALLY the heat went off and the blast furnace is off. I went thru the suggested setup routine for a new actuator install, and it went pretty good. I watched the actuator when going from coolest to warmest settings, and the actuator seems to be a little...

OK, I'm going to get an actuator. Then maybe later you guys can help me with some of those codes. I've been chasing the PO420 for awhile, I'll tell you what I've tried. First, got to stop the blast furnace in this car. Thanks again for the help...

I have to admit I am not that knowledgeable about GM products. I don't know if it's first or second generation. I have the VIN # it has a 5.3 V8 and leather seats. I don't know much more. I bought a code scanner and found it also has the following codes: PO420 PO446 PO463 I've...

A little more info: The hot air is coming out all the vents, and the AC won't turn on. The compressor does cycle on briefly then the clutch kicks out. I thought we could tackle that issue if and when we could get the hot air stopped. Hot air out front and back vents. She said it started a...

It's my daughter in laws car, but I think the issue started over the winter when AC was not being used. They drove the car to Wichita yesterday and said they just about roasted getting back home to Wellington. I think the AC does have an issue also as I can tell now that it is warmer and you...

Yes, I'm new to this forum. My daughter in law has a 2000 Tahoe that only blows very hot air out the vents. It seems this is a common issue, and I see other people looking for help, but no one is helping. I guess if it's been talked to death, and you are new to the site no one wants to talk...

So I take one "upstream" sensor out at a time, but do you just leave the hole open or do you have to find a plug to put in it? I also thought about moving both left side sensors to the right side and see if I get 0430. I think that code is the same faults, but on right side bank. I have been...

I just joined the forum today. So, I'm sure this has been discussed but can someone please give me some help?? My 2000 Tahoe with 5.3 engine is running rough at idle, sometimes dies. The code scanned was P0420 and the print out gave me several possibilities. The codes were reset two weeks ago...