When the outside temp gets above 90 degrees the ac will begin to blow hot air. If I switch to Max AC and high fan speed it will eventually begin to blow cold air again. I can then switch back to AC and it will cool for awhile until it starts the hot air again.
I have checked the freon levels and it is good. I've also checked to make sure the compressor clutch is engaged. It does not blow hot air idling.
I'm hoping for some direction in finding the cause of this intermittent problem.

The ac has very cold air idling. The compressor is engaged. I have cleaned the coil. When driving the ac air will blow cold, then not as cold, and back and forth but will keep the cab cool. When it gets above 90 degrees out side it will start blowing hot. If I turn the knob to full cold, max ac, and high fan speed, it will eventually blow cold air for several minutes. I've stopped and the compressor is engaged and the high side is hot and the low side is cold under the hood.
As long as it is left on max ac and high fan speed it stays cold, but it can get too cold. If I tun it to ac and lower the fan speed it will eventually turn hot again. Is the problem in the control, an actuator or vacuum?

truck drives fine. temp rises gauge goes up, then like thermostat opens temp goes down, but fluctuate already changed out thermostat for new one

The passenger side window will not operate from the window switch on either door. Is this the motor or the regulator?

I believe one or more fuel injectors are acting up. What do you suggest to fix it? I have taken it to a reputable Chevy Dealer.

I have changed fuel filter, air filter, plugs, wires, distributor cap, rotor x 2, ignition coil, cam shaft position sensor, crankshaft position sensor, and radiator. I am not showing correct temperature on the gauge but that is the only other issue. I have also changed the radiator and oil cooler lines. Any ideas?

My exhaust starts off quiet and all of a sudden gets loud and looses a little power and check engine light comes on. Then goes back to normal then gets loud again and so on???? Please HELP!!!!

The gauge will move very little as the engine warms up. It actually stops at about 170.

Express 3500 cutaway. Been sitting 2 years. Put in new fuel, and added stabil to tank, charged battery, turns over but doesn't want to start.

I had a bulb out on third break light I replaced it now when lghts on all lights on .on side of truck and third brake light works hit brake buttom lights go out on side checked all lights and sockets no corrosion

My passenger side headlight is not working

I grounded the alternator and stil the same

can not get the truck started

2010 Chevy express 3500 6.0 P0304 code
Already changed plugs, wires, coil pack ,injector ,MAF sensor, coolant temp sensor, cleaned throttle body then cleared code
Slight rough idle and still getting code P0304
No apparent vacuum leaks found
Any suggestions?

Stabiltrac coming on 1-2 seconds no reason for it to come on . dry conditions , only on take off and not all the time ???? Anybody ?

Stabiltrac is coming on just for a second or two just on take offs now and then, but starting to do it more often. in dry conditions! Light on dash (stabiltrac) comes on and goes out

i looked under the starter am assuming it must be in the front?

Replaced fuel pump recently. Veichle will noy run.shouldnt there b 12 volts @ the pump?

is it electric, vacuum, manual cable,