My Carnival doesn’t get warm air under my feet?

My Carnival does not have warm air under my feet. When the wind direction is adjusted to the foot shield, I can hear the sound of the fan turning, but there is no warm air at all. The front windshield has a very strong warm air, and the wind direction is adjusted to the far right. bounce back. Can anyone please help describe where the problem is. Thanks! My Fiesta (check transaction price | model details) does not produce warm air under the feet. The wind direction is adjusted to the foot shield and the sound of the fan can be heard, but there is no warm air at all. The front windshield has a very strong warm air, and the wind direction is adjusted to the far right. It also bounces back. Can anyone please help describe where the problem is. Thanks! Hello, I have the same problem as you with my Fiesta air conditioner. Has your air conditioner been repaired? What is the problem with which part? It's enough that the repairs will cost a lot of money. Can you please give me a try? Thanks?. First, let’s understand the principle of air conditioning and refrigeration: the low-pressure steam of the refrigerant in the refrigeration system is sucked into the compressor and compressed into high-pressure steam and then discharged to the condenser. The indoor air circulates continuously to achieve the purpose of lowering the temperature. To put it simply, it is the same as the household air conditioning refrigeration principle that we are familiar with. They all use the principle of refrigeration that the instantaneous volume expansion of R12 or R134a after compression and release will absorb a large amount of heat energy (currently, car air conditioners mostly use R134a). Car air conditioners are divided into four major parts, namely condenser, evaporator, compressor and expansion valve. After understanding the principle of air conditioning refrigeration and some main components, let's analyze the common fault points that the air conditioner does not cool when idling, but does cool when driving. 1. The refrigerant in the air conditioning system leaks completely, resulting in no refrigerant, so the air conditioner stops cooling. Treatment method: You can check whether the pipelines, air conditioning pumps, condensers, evaporation boxes and other components in the air conditioning system are damaged, causing refrigerant leakage. Another inspection method can be to add fluorescent agent while adding refrigerant. After using the vehicle for a week, use a special fluorescent light to check the air conditioning system. If there is a leakage point that will light up, it means that this component is damaged. 2. Internal damage to the air conditioning pump, such as damage to the piston ring inside the air conditioning pump, damage to the clutch suction cup, etc. As a result, the air conditioning pump cannot work and the cooling effect cannot be started. Generally, abnormal noise will occur when the air conditioning pump is damaged. Solution: Check the air conditioning pump. If it is damaged, replace it. 3. The condenser fins in the air conditioning system are too dirty, causing the pressure and temperature of the air conditioning system to be too high. In order to protect the air conditioning system, the air conditioning pump stops working, so the air conditioner does not cool. When driving, the vehicle speed can be used to dissipate heat from the air conditioning system, so the air conditioning system will cool down while the vehicle is moving. Treatment method: You can use a high-pressure water gun to clean the heat sink of the condenser. After cleaning, use a high-pressure air gun to blow dry. Understand the working principle of air conditioning and heating. According to the type of heat source, automobile heating systems are mainly divided into two types: one uses engine coolant as the heat source (currently used by the vast majority of vehicles), and the other uses fuel as the heat source (used by a few mid- to high-end cars) . When the engine coolant temperature is high, the coolant flows through the heat exchanger in the heater system (generally called the small heater water tank), and heat exchanges between the air sent by the blower and the engine coolant. The air is heated by the blower It is sent into the car through each air outlet. The heat source we understand uses the heat of coolant to heat and the principle of heating, so we first need to check whether the coolant is sufficient. If the coolant is missing, the heating effect of the air conditioner will be poor. It is also necessary to check whether the cooling fan is working normally. If the cooling fan is constantly turning, the water temperature cannot rise, and the heating effect of the air conditioner will also become worse. A clogged or leaked heater water tank will also result in poor heating effect or even no heating at all. The above points are the most common fault points of poor air conditioning and heating. Therefore, the coolant needs to be replaced regularly. Failure to replace the coolant for a long time will cause the coolant to deteriorate, reduce the cooling effect, block the heater water tank, and cause the air conditioner to have poor heating effect. The coolant replacement cycle is generally about once every 2 years and 6W kilometers. . The reasons why there is no warm air in the car air conditioning system are: the engine thermostat fails. Hot water valve or hot water valve vacuum actuator failed. The heater inlet and outlet pipes are blocked or the heater core is blocked by scale. The temperature control damper or control cable is damaged. The air conditioner blower is damaged or the blower control circuit is faulty. The air conditioning distribution pipe is clogged or leaking, etc. There are various reasons why the car air conditioner has no heating. It is not recommended that car owners repair it by themselves to prevent greater damage to the car. After the problem occurs, go to the local after-sales service as soon as possible to assist the staff to solve the problem as soon as possible.

It should be that the four-way valve is not working because the computer board is not supplying voltage to the relay, which means there is a problem with the computer board. A simple repair is to connect the power cord of the four-way valve directly to the 220 power supply and it will be OK. The reason why it does not start is Because the outdoor unit is not heating, the temperature sensor inside does not feel the starting temperature, so it has been in a standby state @2019