heater ac blower has no power bad ground wire

heater ac blower no working new blower, there is no ground i do a temp hard wire to car frame to get blower to work till i see a mechanic?

My car has 107000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
On your vehicle, the ground may be switched through a controller. If you bypass the controller and directly ground the blower it will run at only one speed, namely high. If you do not have the vehicle wiring diagram, or at least a voltmeter, it will be risky to make any circuit changes because if a short circuit were to occur, or other mis-wiring, that could damage other vehicle electronics and possibly cause injury (batteries store lots of amps). Your best bet, and really the cheapest option, is to just have the blower circuit diagnosed and if it is indeed the controller (or resistor block), the mechanic will be in a position to fix it right then and there, once the part is obtained. To request that service please use YourMechanic’s blower motor circuit/resistor block service page. If you have further questions or concerns as you decide what to do, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you get the best possible results.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a Chevrolet Cobalt ac isn`t working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. You may not realize there`s a refrigerant leak until the air conditioner stops blowing cold.
The change in resistance controls the current through the blower motor, which in turn limits the speed that the blower motor spins at. When high speed is requested, the blower motor resistor is bypassed and the blower motor ground circuit is connected directly to ground.
If the heater isn`t blowing hot air at you when you turn the system on, the blower fan might have a problem. Either it`s not getting electrical power or, more likely, the motor itself has simply burned out. A blower motor in an older vehicle is likely to burn out over time, and may need replacement.
To protect the blower motor power circuit, a 20-, 25- or 30-amp fuse is usually located in the fuse panel under the dash. The rating of the fuse will depend on the vehicle application and how much power the blower motor requires at full speed.
Your car`s air-conditioning stopped working most likely because of a freon leak or a bad compressor. While these causes may be the simple to spot reasons that your air-conditioning isn`t cooling in your vehicle, a dirty cabin filter or a bad belt could also be the problem.
If your air handler is running but not blowing air, there are two likely scenarios; either a broken AC blower belt or an issue with the motor itself. If the air handler is humming or buzzing, but not making the mechanical sounds of a motor running, you`re most likely talking about an issue with the motor itself.
If the resistor is connected to ground (V = 0) at one node and if current flows into the other node then there is a voltage drop across the resistor due to electrical work and the voltage is always more positive at the node where current enters the resistor.
The blower motor relay is the electrical switch that is used to supply the power for the vehicle`s blower motor. The blower motor is the component responsible for pushing air through the vents of your vehicle`s heating and air conditioning systems.
If the fan doesn`t work, before pointing the finger at the blower motor, check fuses for the motor to make sure they`re still good. Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.
1) A Bad Fuse

The most common reason why your blower motor won`t work on any speed is that you have a bad or blown a fuse. A fuse is a small wire inside of a connector that is used to protect the motor itself from a surge of electricity.

Why Is My AC Fan Not Spinning? In short, common issues that can cause an air conditioning unit fan to stop spinning are electrical issues, problems with the capacitor, contactor issues, a burnt out air conditioner motor, a broken fan belt, or clogged air filter.
The blower motor is responsible for sending air through the vents of your car. Over time, blower motors can become damaged, or completely fail. In which case, air will no longer come out of your vents.
The most common cause of a vehicle`s air conditioner not getting cold enough is that it needs to be recharged. You can recharge your refrigerant by yourself, but to save time and make sure the job is done correctly you should make an appointment with your local professional auto shop.
In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. Essentially an on/off switch, the blower motor relay`s reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor.
In summary, to test a resistor we need to measure its resistance value. If this resistance value we measure is equal to its actual value, then it is a good resistor. If not then it is a bad resistor.
The most common reasons a Chevrolet Cobalt heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. Search our network of RepairPal Certified shops near you to speak with a technician about your issue. Oops! We got lost!

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

heater ac blower has no power bad ground wire
ANSWER : On your vehicle, the ground may be switched through a controller. If you bypass the controller and directly ground the blower it will run at only one speed, namely high. If you do not have the vehicle wiring diagram, or at least a voltmeter, it will be risky to make any circuit changes because if a short circuit were to occur, or other mis-wiring, that could damage other vehicle electronics and possibly cause injury (batteries store lots of amps). Your best bet, and really the cheapest option, is to just have the blower circuit diagnosed and if it is indeed the controller (or resistor block), the mechanic will be in a position to fix it right then and there, once the part is obtained. To request that service please use YourMechanic’s blower motor circuit/resistor block service page. If you have further questions or concerns as you decide what to do, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you get the best possible results.

I have a 2003 Saturn L200 2.2L Manual Drive and the heater or AC will not work no air blowing.
ANSWER : Hi there. From the description you have provided, it would appear, you have covered the bases concerning your vehicle’s inoperative blower motor. However, I am lead to believe the problem is still, no power supplied to the blower motor connector. It could be an ignition switch problem. It could be a faulty blower motor relay. I recommend having your vehicle’s inoperative blower motor be diagnosed and repaired by a certified technician from YourMechanic.

Burnt yellow and brown wires at blower motor resistor, is this indicator of bad resistor or bad motor? 2011 Chevrolet Malibu
ANSWER : Hi there – most likely, the problem is the blower motor resistor pack. A quick way to test this is if the blower fan still works in the "Max" position. If it does, that pretty-much rules out the motor as the problem. The resistor pack can get pretty hot while running the fan in lower settings, which could damage the wiring to it just from the heat. If the resistor shorts, increased electrical load could burn the wiring insulation as well. I would suggest an electrical inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

I have a bad oxygen sensor, bad power steering sensor, and a bad cam shaft sensor? Should I replace any of them?
ANSWER : When you say you have three bad sensors I can only assume you have had them tested and the end result is three bad sensors. If they tested bad then they should be replaced. The power steering sensor senses the load of the steering on the engine so it can raise the idle during parking maneuvers. The O2 sensor is used for fuel control and it may effect engine power and fuel mileage. The camshaft sensor cay cause no starts, engine running problems and all three will turn on the check engine light.

Reverse lights won’t turn on when I put it in reverse. Dark blue wire has power, light green (reverse) wire has no power.
ANSWER : Hi there. Remove the fuse to the reverse lighting system. On the side that does not have power, use a digit ohm meter and check for resistance. The meter should read OL (out of limits). Now, turn on the ignition key to the ’ON’ position, set the parking brake and chock the wheels, and put the transmission in reverse. Check the connection again for resistance. There should be a resistance of 5 ohms or less. If the meter reads OL, then there is a break in the wiring from the fuse box to the switch. Since you disturbed the fuse box, there could be a wire that is loose or broken that goes to the reverse lights. If you need further assistance with your reverse lights not working, then seek out a professional, such as one from Your Mechanic, to help you.

What would cause the clutch on an ac compressor to continue to go bad after being replaced three times?
ANSWER : The compressor clutch relay on these vehicles are a known cause of sticking on the compressor clutch and overheating the A/C compressor clutch coil. Replace the A/C relay to see if it cures the clutch going bad the next time you do a compressor clutch replacement, or replace it now if you have just replaced the clutch.

Heater control system will not power up even though there is power to it
ANSWER : Hi and thanks for contacting Your Mechanic. When the penny was in the cigarette lighter, the penny act as a conductor and shorted out the circuit. The cigarette lighter is either powered all the time or powered when the ignition switch is on, but either way, the cigarette lighter is tied through the ignition switch. Check the fuse box for power to it and ground. If the fuse box has power and a ground, then the ignition switch burned from the short in the cigarette lighter. This would explain that phenomenon light issue and all of the electronics failing in your vehicle. Check all of the wiring to the ignition switch and the main power to the switch. If there is power to the switch but no power coming out of it when the key is in and turned to ACC or ON positions, then the switch needs replaced. If the switch is working fine, then the fuse box has a short in it and it needs replaced. If you need further assistance troubleshooting your massive electrical outage in your vehicle, then seek out a technician, such as one from Your Mechanic, that can assist you.

If I get my blower motor replaced, do I also have to have my Ac recharged after replacing blower motor?
ANSWER : The blower motor on this vehicle is a simple removal and installation and does not require anything to be touched on the A/C. The refrigerant does not have to be removed. The only component that has to be removed is the glove box under cover to get to the blower motor.