Climate control is not workkng

Today I was driving and using the a/c then I smelt smoke and saw smoke out the side window. After, I saw that the a/c button would turn on but blink. The rear defrost button doesn't turn on. I turn the fan to all settings and don't feel any air come out. I checked the compressor it's not spinning but the fans should still work right? I suspect the blower motor might be screwed but idk.

My car has 194660 miles.
My car has a manual transmission.

Experienced mechanics share their insights in answering this question :
You will need to see what component blew out all the refrigerant out of the A/C. In the process, it may have blown a fuse to the A/C causing no blower or compressor to come on. If you seen smoke, then this may be from the A/C compressor or line blowing. I recommend having the AC system pressures checked and diagnosed by a mechanic. From there, they will be able to have the correct repairs made on the car.

How to Identify and Fix Common car Problems ?

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

There can be a number of reasons why you can air conditioning is not blowing cold air. The most common reasons could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge (regas) your air conditioning.
Fuse Protection

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.

If your vehicle`s climate control system is not turning on at all, it may be a problem with the system`s electronics. The fuse may have blown or an issue with the wiring may be present. Electrical issues such as this may also be caused by a failing battery.
The blower motor controls the airflow for the heating and cooling system; it is one of the main components for the HVAC system to operate properly. The blower motor turns on the fan in your HVAC system, allowing the air to circulate out of the system and into the rooms of your home.
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.
It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.
Where is the AC Fuse Located? The AC fuse on most HVAC systems is typically on the unit`s control board. You`ll normally find the board behind an access panel on the unit`s lower compartment. While you sometimes have to unscrew areas to access the control board, others have clips.
Common signs include inconsistent cooling, out-of-date software, and uneven air distribution, since the module controls the whole AC system.
Evaporator sensors

Controlling the temperature of the evaporator is one of the most important functions of temperature sensors in air-conditioning systems. The cooler the evaporator, the faster and more efficiently can the passenger compartment be cooled.

If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.
Inconsistent blower motor operation

If the capacitor is bad, the blower motor may run slowly or inconsistently, or overheat easily. If you notice that your blower motor works strangely or short cycles, make sure to contact professionals to inspect your capacitor.

Climate control consistently monitors the temperature in the car and then heats or cools the cabin space accordingly, whereas air-con is more of a manual system where you have to tell it what to do. You set the temperature and fan speed, and then the air con will stay on those settings until you adjust them yourself.
Some air conditioning systems have a reset switch, which is a small, red button. Typically, the button will be on the outdoor unit. If you have a problem locating it on the outdoor unit, you may find relevant details on the equipment`s manufacturer`s manual. Press the red button for three seconds and release.
Clogged air filters are one of the most common reasons a thermostat clicks but AC does not turn on. A filter cleans the air before it circulates throughout your home, trapping dirt particles, dust, and pollen. Over time, these contaminants will clog the filter, limiting airflow to the HVAC system or furnace.
Check the Filters and the Vents

Blower motors are designed to circulate air, so they won`t work if there`s no air to move. You should always check the filters and vents surrounding the blower to make sure that the blower isn`t having a hard time working.

The blower fuse is a 40 amp fuse located in the engine compartment`s fuse box.
Air conditioners use fuses as a way to protect the condenser from being exposed to excessive amperage. Fuses are designed to handle a limited amount of amperage based on the maximum amount that the unit is rated for: If more amperage passes through, the fuse will blow to protect the condenser from overheating.
The blower motor is the electrical switch on the interior of a vehicle that allows the driver to control the vehicle`s heating and air conditioning system. It is usually built into the the same control panel that houses all of the AC system controls, and is labeled with numbers and symbols to indicate blower fan speed.
If there is the voltage on the “line” side, test for voltage on the “load” side of the fuses by placing the meter`s leads on the load wire lugs. If you read voltage on this side(220-240V), this means the current is flowing through the fuse. If you get a zero-voltage reading on the load, this means your fuse is blown.
A typical vehicle will have multiple fuses connected to the operation of the AC unit. To locate the correct AC fuse(s) in your vehicle`s fuse box—and the fuse box itself—refer to your owner`s manual. You can usually tell a fuse is blown if the wire within the fuse is visibly melted or burned.
The climate system activates the components of air heating, conditioning, and ventilation systems. This is an ECU that controls the climate system. The sensors outside and inside the vehicle transmit information to the ECU which activates executive units (damper drives and a fan electric motor).
At its core, the acronym ECU (Environmental Control Unit) is the military`s terminology for a heating, ventilating, and air conditioning (HVAC) unit, but key differences in mobility, ruggedization, and ability to face extreme temperatures put these into a category all their own.
Signs of a Faulty Sensor

You might notice that your air conditioner doesn`t turn off when the house reaches the set temperature if you have a faulty sensor, Your AC will just continue to blow cold air. The temperature may even become uncomfortably cold.

The AC sensor on your thermostat is located near the evaporator coils. Indoor air moving toward the return vents passes by the sensor and coils. In turn, the sensor reads the temperature and checks if it matches what you`ve set on the thermostat.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

The climatic control is on one temperature all the time hot on drivers side cooler on passanger side the flap control moter for ho
ANSWER : A temp sensor malfunction could be causing your problem. If the controller is getting bad information, it’s going to operate the doors according to that information. So a sensor replacement is indicated. However, these systems can also have problems with the stepper motors themselves that drive the flaps. All the little plastic gears can get jammed up. In most cases, the self diagnostics will catch that and give you a code, but not always. If you have the right scan tool, you should be able to activate the motors and watch them work. Working on the climate control can be difficult and time consuming, if you want to have the job taken care of for you, contact YourMechanic and they’ll send a technician to your home or office to diagnose your climate control issues and advise you as to what to do about it.

Read Full Q/A … : Climate control is not workkng

Does non-climate control car AC cut-in & cut-off automatically?
ANSWER : A/C systems that used fixed displacement compressors will cycle on and off (the compressor that is) depending on cooling demand. If you have a variable displacement compressor in your vehicle, though, the compressor may hardly ever cycle simply because the compressor is capable of load following. In fixed displacement systems, without automatic climate control, the rate of cycling is usually determined by pressures within the system. An example of this type of system is what’s known as a CCOT (cycling clutch orifice tube) system. The compressor clutch will cycle on and off depending on cooling demand, usually at around 21-23 psi on the suction side, but of course there is variance from car model to car model. On newer car, the vehicle’s PCM is involved in the control strategy, too, as the PCM can command the compressor off during periods of high engine demand, such as rapid acceleration. Insofar as climate control heating and HVAC systems, those are electronically controlled and, in the main, merely "automate" all the mechanical controls that formerly were used to control the position of blend doors and the heater control valve. Control strategies are electronics-based. If you need a diagnostic of a vehicle HVAC problem, performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request HVAC inspection/testing and the responding certified mechanic will address your issue(s). If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Read Full Q/A … : Climate control is not workkng

What climate control elements can be controlled from the touchscreen?
ANSWER : If your Fusion has the touchscreen navigation system installed, then it’s tied into your Automatic Climate Control system as well. You’ll find that some of the physical controls on the HVAC system are duplicated on the touchscreen (that way, if the touchscreen doesn’t work you can still control all aspects of the system). What can you control from the touchscreen? Here’s a quick rundown:

Temperature Conversion: Not happy with the Fahrenheit readout? Use this to change it to Celsius.
Temperature: You have two temperature controls, one on the left of the screen and one on the right. Use the left one to control the driver side temperature (and the passenger side if dual zone isn’t active) and the right one to control the passenger side temp.
Vent Controls: You have four vent control options on the touchscreen, including:

Defrost and lower vents
Upper vents
Upper and lower vents
Lower vents only

The Active Vent setting displays at the top of the screen:

Fan Speed: Use this to adjust the fan/blower speed.
Dual: Press this to turn on or off dual zone climate control
Max A/C: Turns on maximum air conditioning.

Read Full Q/A … : Climate control is not workkng

ABS, ESP, EBR malfunction
ANSWER : You’re getting into an area that is kind of a dark art when you’re getting these kinds of codes. While I don’t know any of the symptoms that the car is exhibiting, I can tell you that failure in one of the control units can lead to codes showing up in the others and the ABS, ESP is a likely culprit since it interprets the wheel speed signals and sends the information to the other modules. You’re right that the module has to be coded, and I don’t think that Snap On has the software for that so the only place to go is the Star Diagnostic. (The consumer version of the Mercedes SDS ) You can Contact YourMechanic and see if anyone in your area has the appropriate equipment for this. Otherwise, this may be a case that would best be consigned to the Mercedes Dealer.

Read Full Q/A … : Climate control is not workkng

Pressure Control Solenoid ‘B’ Control Circuit Range/Performance Read more: asked by Donald L
ANSWER : Hi there. The trouble code you indicated is similar in many ways to the P0963 OBD-II code. This article should give you a lot of valuable data that will explain the source of this code, possible causes and repairs. In general, this code is related to a communication error with the transmission pressure control solenoid. Most of the time, the code is triggered due to the solenoid being dirty, or the connections are loose. When this happens, the OBD-II trouble code essentially activates a fail safe mode, so that the car will not continue to damage the transmission or other components.

Read Full Q/A … : Climate control is not workkng

Climate control no mode function?
ANSWER : Hello, thanks for writing in. I’d be happy to help.

From what you describe it appears that your vehicle is experiencing some sort of electrical issue. It may be possible that the some sort of wiring problem has occurred, or that the components you replaced are defective. I would carefully inspect the vehicle for any wiring issues, though from what you describe, the unit operating in reverse, it is more likely that the component is defective. It is not uncommon for aftermarket components to be defective out of the box, so if you suspect the component may be defective, I would replace it. A wiring diagram can be sourced from either the dealership, or out of a quality service manual.

If you would like help inspecting the electrical components, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make any repairs as needed.

Read Full Q/A … : Climate control is not workkng

Adding cruise control on a factory non equipped car.
ANSWER : The unfortunate truth is the dealer is correct. What you are doing is in theory feasible but not common at all. I haven’t run across anyone who has done what you are doing and I have often wondered how such an endeavor might work. My point here is, I am not surprised the dealer isn’t sure because it’s likely they have never done this themselves. The dealer doesn’t set up the PCM (Powertrain Control Module) in the cars they sell. The manufacturer does and guessing what happened when a car is being built is not common knowledge.

Anytime you modify any car, there are always details such as this that you will possibly have to address. When you choose to modify a car, you are now the engineer. The simple answer is that I can’t tell you with certainty whether or not the PCM in your car has cruise control capability. The only way to find out is to allow the dealer to check in out. Independent shops might possibly be able to, but the equipment they have is aftermarket and not produced by Mazda. The electronic equipment the dealer has is. The dealer equipment will most likely be able to do what you need.

Read Full Q/A … : Climate control is not workkng

Climate control off by 8 degrees
ANSWER : Hello Dennis, thank you for writing in. The automatic climate control uses a cabin temperature sensor, blend doors, and engine temperature sensors to regulate the air coming into the cabin. There may be an issue with any of these components, or the communication between them. There are several other complaints about the system, and the best way to go about it is to make sure the sensors are calibrated correctly. You should also if needed test to make sure the blend doors are activating and working to keep the temperatures properly regulated. Considering your symptoms, you may want to focus on the cabin temperature sensors first. For more help resolving the issue, contact our service department to schedule an appointment.

Read Full Q/A … : Climate control is not workkng