Category: auto ac hvac box maintenance

Weak air flow from ac vents in car

Weak air flow from a/c vents in car

Weak air flow from a/c vents in a car could be caused by:

  • Underperforming A/C Blower motor
  • Restricted in cabin air filter
  • Restricted a/c evaporator core
  • Auto a/c system low on refrigerant charge(Freon)
  • Faulty Expansion device
  • Incorrect refrigerant charge after service
  • A/C system contaminated with moisture.
  • Auto A/C compressor operating constantly
  • ECU cycling control bypassed
  • A/C cycling control switches bypassed
  • Evaporator temperature sensor malfunction
  • In cabin temperature sensor malfunction.
  • A/C ducts restricted with debris
  • A/C ducts flaps partially closed

How much air should be coming out of vents ?

The amount of air that should come out from the vents will depend on the settings the driver has selected. In Automatic Temperature Control systems (ATC) the driver can choose a given temperature  and have this temperature setting maintained by the a/c and heater control system.

This Fully automatic systems usually control most of the specific functions of mode operation, temperature control, blower speeds and heater temperature control. The system will automatically maintain the desired temperature and quantity of air for each mode  and will route the airflow according to the need.

Why is my vent blowing weak air out.

One of these could be the reason why the vent is not blowing out enough air:

  • Fuses, fusible links, and wiring
  • Refrigerant charge and compressor operation
  • Coolant level
  • Heater core
  • Evaporator core
  • Blower motor control module
  • ECU
  • ECM
  • BCM
  • PCM
  • Ambient temperature sensor
  • Sun Load Sensor
  • Coolant temperature sensor.

The proper function of the ATC depends upon the electrical inputs of several sensors. The programming that enables the ECM  to provide control of the system naturally tells the engine computer how to interpret these signals. The ambient temperature sensor is located just behind the grille outside the vehicle. Its job is to sense the outside air temperature and to adjust the ATC accordingly. In cold outside temperature the a/c compressor may be blocked to prevent ac compressor damage due to lack of proper internal oil lubrication.

The sun load sensor is mounted on top of the instrument panel. It senses the intensity of sunlight and adjusts the ATC to meet the demand.

Coolant temperature sensor. Its signal may come to the programmer directly, or be communicated to the programmer by the electronic control module (ECM).

How to unclog weak air flow from ac vents in a car

Poor air flow from vents in a vehicle could be related to any of the issues mentioned above. With the right tools and training the vehicle could be operating up to specifications in no time.

Do you need assistance with a Weak air flow from ac vents in car issue ?

We have ASE certified  auto a/c mechanics near you. We can take care of any problem related to the a/c system that your vehicle may have. Call Us Today ! We service Miami-Dade County areas, Hialeah, Doral, Miami Lakes, Hialeah Gardens, Medley.

evaporator core replacement

Air flow restriction.

When the fins and air passages of an evaporator are clogged with dirt, air will have a difficult time passing through the evaporator. Since the principles of air conditioning require the heated air around the evaporator to lose heat, a vehicle with a clogged evaporator will have poor A/C performance.

Evaporator core maintenance.

The evaporator core should be removed from the case to properly clean it. Airborne debris, such as leaves, lint, hair, and other contaminants, enters the evaporator case and clings to the wet evaporator core.

The A/C drainage.

The drain is for the purpose of removing the condensation that forms as a result of humidity being removed from the intake air. It is nearly impossible to adequately clean an evaporator core without first removing it from the case.

Do you need to service the evaporator core in your car ?

Call Today ! We have ASE certified mechanics near you to service and replace the evaporator core in your car.

How can i make my car ac colder

What causes water on the floor of a car?

The evaporator water drain is an integral part of the evaporator housing assembly. A crack or break in the housing may reduce the cooling capacity of the air conditioner.

Engine hot air leak inside hvac box. 

If the case has a crack or break on the engine side of the firewall, excessive engine heat may enter the case and thereby reduce the efficiency of the air conditioning system.

How do you unclog a car AC drain line?

If the evaporator (water) drain becomes clogged, it is easily cleaned with a stiff wire from the outlet in; care should be taken not to puncture the delicate evaporator core.

Do you need an Auto A/C mechanic ?

Call Us Today !

ac vacuum controlled door

AC vacuum controlled door.

MANUAL CONTROL SYSTEMS

The air delivery system controls the movement of heated and cooled air into and throughout the passenger compartment. The Hvac housing is the plenum unit located and beneath the instrument panel. It contains the evaporator, heater core, the blower motor assembly, blower speed control device and the vacuum controlled door actuators.

The plenum houses the air doors and door actuators that direct airflow to the correct ductwork. The doors may be controlled by cables, vacuum, or electrical actuators. Single zone systems are usually equipped with three doors.

 

hvac box showing harness ,door actuators and vents.

AC vacuum-controlled door actuator main fault

Automotive ac climate control panel levers may operate a rotary switch to select the various vacuum or air routings to the motors that control A/C modes. The main fault experienced with vacuum-controlled door actuators is vacuum leaks.

 

Do you need assistance with the ac vacuum-controlled door in your vehicle?

We have auto ac mechanics in your area in Miami-Dade County. Some ac door actuators may be located underneath the dashboard of the vehicle and to get access to them could be labor intensive. Give Us a Call Today!

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2005 Toyota 4 Runner,in cabin air filter access.Glove compartment removal.

Cabin air filters remove dust and pollen from the outside air entering the AC system.

Cabin air filters remove dust and pollen from the outside air entering the AC system. Re-circulated air should already be cleaned by the cabin air filter as it entered the car. All sources and heated air only are ruled out by the filter being in the outside source, which supplies air for ventilation, heating, and AC operation.

Do you need to get the ac cabin filter in your vehicle replaced ?

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How can i make my car ac colder

A routine A/C maintenance service should include all of the following: 

  1. Checking the condenser mounts.
  2. Removing debris from the condenser fins.
  3. Straightening the condenser fins.
  4. Cabin air filter check up
  5. Hvac box drain tube check up
  6. temperature at the vents check up

Do you need a routine auto a/c system maintenance ?

We have a mobile auto a/c care center near you in Miami-Dade County.