Tried to turn Control Knob(to MED COOL)and it doesn't work like stripped so just unplugged. We have heat wave.Can I just plug it in to run it or will that be dangerous?

Depending on what model. If the unit has a selector switch the one that has high cool, med cool, low cool. then replace this switch. if it is the new model the kukl unit then replace the electronic control board.

i would think the vent direction control isn't moving the heater box vent , stuck in the open position so only hot air from the engine ,strip out the control panel a check that the direction control cable is connected both ends ,

Heater valve is stuck or needs replacement. I doubt if it is the knob. If you coolant hasn't been flushed out for a few years ..get it flushed and replace the valve. GM uses dexcool coolant that still to this day gums up when it get old and can mess up valves and gaskets.

Sounds like the cold control has stuck . Unplug the two wires from the cold control and plug them together. Turn one wire over and plug it into the other. away from the cold control.
The cold control is the knob in the ref that turns it on and off and has numbers on it.
If it runs then that cold control is the problem.
If this doesn't work Do this

That is probably the compressor relay or cold control (Thermostat
The relay is on the compressor and needs replaced
A relay starts the compressor with a higher voltage and then quickly kicks out
Thats what is happening with yours
Its best for a tech to replace The relay but you can do it
Take your model number to your Local Appliance parts store they will have a diagram
showing you how to install the relay. Its called a hard start relay
also try hooking the two wires together on the cold control to route around the cold control.

Thank you for using fixya
Leo Ponder
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Sounds like a bad sequencer (the thing you unplugged the wire from probalbly). It will have 24vac supplied to the heating element in the sequencer and most likely 240vac being passed by the sequencer to the heat strips. This parts are not very expensive and can be purchased at a heating and air supply or a mobile home supply company. You can turn off the power and use an ohmmeter to figure out which one is bad. There may be only one or there may be 2 or 3. Let me know what you find.

you are sure the knob is not stripped right ....it all runs on vacuum look underneath and ensure they are all attached to the cluster on the knob as well check the vent itself and that the cable is not kinked preventing operation ..passengers side upper corner

You need to check if the heat strip is still good on it or that it is receiving power. If its getting power, then the strip is bad.

hi The thermostat control is usually mounted inside the refrigerator. Its visible control knob is turned to regulate the refrigerator/freezer temperature. The workability of this control can be tested in various ways, depending on the problem. To test the thermostat control:

Step 1: If the compressor runs all the time, turn the control knob to the OFF position. If the compressor still runs, unplug the unit, then pull off the control knob and remove the screws holding the thermostat in place. Pull out the thermostat and remove either the red or the blue wire from its terminal. Plug in the unit. If the compressor doesn't run, the thermostat is faulty. Replace it with a new thermostat.

Step 2: If the compressor runs after the wire is removed from its terminal, there is probably a short circuit somewhere in the unit's wiring. In this case, don't try to fix the problem yourself; call a professional service person.

Step 3: If the refrigerator or freezer runs but the box doesn't cool, unplug the unit and remove the thermostat with a screwdriver. Disconnect both wires from the thermostat. Tape the ends of the wires together with electrical tape, and plug in the appliance. If the refrigerator starts and runs normally, the thermostat is faulty. Replace it with a new one of the same type. Connect the new thermostat the same way the old one was connected.

Step 4: If the freezer compartment is normal but the refrigerator box doesn't cool, set the dials that control both compartments to mid-range. Remove these knobs (they're usually friction-fit). Then unscrew the temperature control housing; you'll see an air duct near the control. Replace the knob on the freezer thermostat and turn the control to the OFF position. Open the refrigerator door and look closely at the air duct. If this duct doesn't open wider in about ten minutes, the control is faulty. Replace the control with a new one of the same type. Connect the new control the same way the old one was connected.

Bypass the 3 way (hi, med, low) switch, unfortunately it'll always be in the high position when you do this. I have done this with one of my heaters and as long as the thermostat is working properly then it will work as it should on the high setting. I took the extra step of connecting the LED light to the bypass so I know when its on.

Just remember to turn it off you'll need to unplug it.

HI The thermostat control is usually mounted inside the refrigerator. Its visible control knob is turned to regulate the refrigerator/freezer temperature. The workability of this control can be tested in various ways, depending on the problem. To test the thermostat control:

Step 1: If the compressor runs all the time, turn the control knob to the OFF position. If the compressor still runs, unplug the unit, then pull off the control knob and remove the screws holding the thermostat in place. Pull out the thermostat and remove either the red or the blue wire from its terminal. Plug in the unit. If the compressor doesn't run, the thermostat is faulty. Replace it with a new thermostat.

Step 2: If the compressor runs after the wire is removed from its terminal, there is probably a short circuit somewhere in the unit's wiring. In this case, don't try to fix the problem yourself; call a professional service person.

Step 3: If the refrigerator or freezer runs but the box doesn't cool, unplug the unit and remove the thermostat with a screwdriver. Disconnect both wires from the thermostat. Tape the ends of the wires together with electrical tape, and plug in the appliance. If the refrigerator starts and runs normally, the thermostat is faulty. Replace it with a new one of the same type. Connect the new thermostat the same way the old one was connected.

Step 4: If the freezer compartment is normal but the refrigerator box doesn't cool, set the dials that control both compartments to mid-range. Remove these knobs (they're usually friction-fit). Then unscrew the temperature control housing; you'll see an air duct near the control. Replace the knob on the freezer thermostat and turn the control to the OFF position. Open the refrigerator door and look closely at the air duct. If this duct doesn't open wider in about ten minutes, the control is faulty. Replace the control with a new one of the same type. Connect the new control the same way the old one was connected.