The AC compressor runs in recirculating mode, and it also runs when set to defrost. It would be interesting to turn the AC off with the button on the center of the knob, and then see if you get the same results in recirculating, and on defrost.

 

Yes same result with the recirculate and defrost I’ve been running the heat halfway and recirculate on.

 

Is the car new to you or did this suddenly start after some work?
So, the behavior is not dependent on the AC button, or on the position of the heater doors just if the compressor is running?
A wild guess: The wire to the compressor is shorting to another wire.
Why run in recirc? If because of allergies, replace the cabin air filter; it probably never has been changed. Heat will mix in all modes.

 

New to me, it was a rebuilt from searching Google it was rear ended missing the rear bumper. Doesn’t look like much has changed under the hood everything is very clean and nothing visible that’s been worked on. From what appears none of the suspension engine etc were damaged. Looks like they’ve replaced the hatch & rear bumper. The car had 84,000 when it was rebuilt, the interior & exterior are like new assume it was an older person or left sitting a lot. I’ll probably have to check it over this weekend I work long hours during the week.

 

Might have been mentioned 3 pages ago. Then you have no idea what a previous owner did to the electrical system. The only way what you describe could happen is with crossed wires. Lends some credence to the fuse box getting jolted or messed with. Maybe some yahoo saw something stupid on Facebook.
Is it when the AC button is pushed or any time the compressor is engaged? When in defrost or recirc the compressor is on with no light in the button. I

 

I just re-read post #1. You say it also runs fine with "85 fuel". Is that 85 octane? I'm thinking you mean e85 (ethanol). It runs fine with e85 with the AC compressor NOT running? This may be the incorrect ethanol percent problem that PulpFriction has had before.

 

It runs really well when the ac is on period rather it be you’re rolling along and you press the button something kicks in and it speeds up very confusing when you turn the ac off it goes back to its old ways of being slow ac off trying to go 60-65 feels like the car is going to fall apart rather it be the gear not changing or engine power loss ..

yes with e85 the car runs very very well regardless a lot smoother, quieter, and quicker. The only e85 available is 45 miles in the wrong direction of work and home.

I suppose Saturday I’m going to take a drive and get some flex fuel and see what happens it’s been about 2 months since I’ve used any but I do remember the car running very good.

 

I found this he also says the transmission was acting strange as well. Am going to tighten fuse box bolts before going to work tomorrow. Wish me luck!

 

as I suggested in post#14

 

Wasn't that mentioned 2-3 times? I guess youtube is more important.