My 04 chevy colorados ac fan does not turn . I changed the resistor and the resistor connector but it still won't turn . I checked to see if the motor still works and it worked when connected to a battery. What is wrong with my ac?

ck switch for power in and out if power out ck resistor

I have a Chevy Colorado which I think is the same dash. I found the connector for the blower resistor was burnt up. I ended up replacing the resistor and connector. I found the parts at my local Napa store. The resistor is located under the glove box door on the bottom of the heater case. Unplug it and see if the connector has gotten hot (melted) if so replace both.

Someone will need to check the fuse for the blower, then the blower motor and the resistor.

It is possible that is a switch issue but it can also be an issue with the resistor which regulates the voltage which in turn dictates the speed.

First check the 15 amp HVAC fuse located in the main fuse block inside the car on the passenger side of the center console, under a cover. If the fuse is good, then the problem may either be the HVAC blower switch (which is the fan blower selector switch), the fan blower motor resistor, or the fan blower motor. An auto repair manual will explain and illustrate for you the steps on how to check each of these components.

Even after pushing the ac light switch on, the fan blower selector switch has to be turned on as well (working) because it provides an electrical path to the positive side of the battery to complete the circuit and turn the ac light on. What the ac light switch does is provide the electrical path for the ac compressor clutch to come on through the ac control relay which is controlled by the car's PCM(computer) when you want ac, but the ac light switch still needs to run through the fan blower selector switch to receive its power. You can turn on the fan without the ac light switch because it gets its ground path(negative) from the blower motor. So the blower motor has to work in order to provide a ground path for the fan blower selector switch to be functional. You could have a faulty blower motor which is why no air blows through the vents. The fan blower motor is located inside the car on the passenger side underneath the dash at the bottom end of the glove compartment box. You'll see it. It's right above where a person rests their feet on the floor. Therefore, if your 15 amp HVAC fuse is good, check to see if you have voltage at the blower motor connector. Unclip the connector and with the ignition on and the fan blower switch moved to any one of the first 3 selections, check for voltage using a multimeter. The voltage will vary because there is a blower motor resistor. Voltage should be higher on setting 3 than 1. If you do have voltage at the blower motor connector, check for a faulty blower motor. The auto repair manual will tell you how to do it using jumper wires.

It's normal that your car is running hot because the radiator fan works in conjunction with your ac compressor. If the ac is on, the radiator fan will be on and therefore the engine coolant temperature will stay in it's normal operating range. If the ac is off, the radiator fan will stay off as well and the engine coolant temperature gauge will begin to rise and show pretty hot (especially at idle). It will do this up until a certain degree then the radiator fan should turn on thermostatically and stabilize the temperature. It's scary and I know what your saying because it does that to my car if my ac isn't on. Don't worry it won't overheat.

How did you determine that the sensor failed. Did the check engine light come on? When you say that the fan won't turn, do you mean that it won't turn on and run or that you can't physically turn it by hand. To determine this, disconnect the electrical connector to the fan and try to turn it by hand. It should turn easily. If it doesn't then it must be replaced. If it does then reconnect the electrical connector to the fan and try to operate it by disconnecting the temperature sensor lead and placing a jumper wire between the terminals of the harness. turn the AC control to AC/MAX and turn the ignition key to on. If the fan runs then the problem is the sensor. If it doesn't then check the fan control relay and any related fuses. WARNING : Use extreme caution when testing the fan circuit. Never attempt to turn the fan with the electrical connector in place. The fan can operate at any time even if the engine is off.

heater fan you are talking about. if is just unplug connector & unbolt it pull fan out it has squirrel looking fan sometimes it has e-clip or nut & fan comes off . fan on the pass. side on firewall on the heater -ac box

remove the passenger side knee bolster ,under the dash the resister is in the blower housing. may also need the connector to the resister.

I had this same problem on my 2006 colorado. when i purchased a new resistor and went to replace it, I decided to check the resistance of each position on the old one with the resistance on the new one. they were both the same. then I decided to look at the harness. I was told that it needed to be replaced as well but I decided to try just the resistor. The harness had one of the connections in the plastic connector that looked like it had over heated. (IE browned char like look) after installing the new resistor, it ran ok for about 2 days then started acting up again. Then I tried my own solution. I pulled the harness loose from the resistor and with the ignition and fan switch off took a paper clip and manuevered it under the connection with the charring and slightly bent the metal connector out. when complete, the adjusted connector appeared to be a tad too far out compared to the other connectors in the plastic. then I reconnected it to the resistor and haven't had a problem since. I did, just out of curiosity switch out the new resistor with the old one and it too also works with no problems. Of course, the dealership will not take back electreical parts that have been placed in use. This should have been a chevy recall but apparently they don't care about anything but the initial sale of their products. I sent an email to GM and got to not response.

I had the same problem on my 2005 Colorado. I changed the blower resistor but still had the same problem. I had no voltage at the blower except on high. After talking with the local Chevy dealer, I found the plug-in connector that goes to the resistor had a burnt place on one of the terminals. AC offers a kit that you can splice into your existing wiring. Took me around 30 minutes to change. Costs around $50. So be sure to check the plug before changing anything out.