Tag: AC poor performance

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.

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How do you flush an auto AC system?

Most automotive manufacturers recommend closed loop flushing with air conditioning refrigerant as a flushing agent. A benefit of this type of flushing is there is no danger of flush contamination , since the flush agent being used is the correct refrigerant for the A/C system.

Avoid this type of auto ac system flushing

Over the years many different liquids have been used as non-approved flushes for a/c systems. The more common are:

  • Alcohol
  • Brake cleaner
  • Carburetor cleaner
  • Mineral Spirits
  • Penetrating oil
  • R-11, R-12, R-113
  • Gasoline

The use of unapproved chemical flushes can result in damage to rubber components in sealing washers, auto ac compressor shaft seals, O-rings and hoses.

At no time should these products be used as a flush agent. If a compressor failure is caused by non-approved flushing agent being left behind in the a/c system, it can void the compressor warranty.

How often should you flush your auto AC system?

When an auto A/C system has become contaminated with air, moisture, flushing agents, the automotive ac compressor oil is contaminated with an incorrect type of oil or from debris from an internal auto ac component failure , or the system has been overcharged with oil, dye,  it must be flushed.

What happens if you don’t flush the AC system in your auto?

The debris created from internal auto ac compressor failure can accumulate and become trapped in the various a/c system components , and restrict the flow of refrigerant and oil. When used in a quantity beyond what the dye manufacturer recommends, dye can modify the viscosity of the ac compressor oil and becomes contaminant. Air as a contaminant may cause decreased auto ac cooling performance, create car ac compressor noise, or increase system pressures. Contaminated auto a/c systems may cause hvac compressor failure, air conditioning hose and line damage due to excessive heat and high pressure and overall automotive a/c system performance decrease.

Do you need assistance Flushing your auto a/c system ?

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ac temperature out of the vents

How the a/c should be operating in order to cool down the interior of your car

Check inside the vehicle:

  • The A/C climate control should be set to Max Cold Position.
  • A/C Climate control set button On.
  • Recirculation/fresh air mode set to recirculate.
  • Engine temperature should be in the normal range (not overheating)
  • Outside ambient temperature should be sensing outside actual ambient temperature.(Ambient temperature should be above 37 F )
  • Engine RPM’s should in the normal everyday range.
  • With the A/C  blower on Max, the mass of air coming out from the vents should be strong.
  • Cabin air Filter should be clean.
  • A/C evaporator coil should be free from debris and leaks.

Check the engine compartment :

  • The front of the vehicle should be free from any road debris.
  • The radiator and A/C condenser should be free from leaves, bugs or dirt.
  • With the A/C system ON the radiator/condenser fan assembly should be operating.
  • The Drive belt should be running all the accessories and in good condition.
  • The A/C compressor CLUTCH should be engaged with A/C ON.
  • The A/C compressor ECV should be modulating the hvac compressor output for max cold.
  • All A/C lines and hoses should be free from dye, oil ,ice or damage.
  • The A/C system should be properly charged with exact amount of refrigerant specified by the manufacturer.
  • Hvac box drain tube should be draining water from underneath the vehicle.

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automotive ac compressor and refrigerant lines

Sun Load or Ambient Light Sensor

The sun load sensor function as an input for the module in charge of automatically controlling the headlight operation and air conditioning system control module.

How to test the Sun Load or Ambient Light Sensor ?

A bright LED light may be used to artificially force the sensor  to adjust for light intensity and angle. With the headlights in the automatic setting position, we should see the running lights coming on and off and the automatic climate control adjusting the air temperature out of the vents. Exposing the sensor photocell to the strong led light will increase the current flow from the sun load sensor while  covering the sensor photocell will decrease the current flow signal to the hvac control module and headlight control module. With a scan tool connected to the vehicle or a multimeter we should be able to see these variations in voltage when the sensor is operating properly. The most common voltage range is between zero and five volts, but is always a good idea to compare the readings against manufacturer specs.

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automotive ac compressor and refrigerant lines

Solar Sensor, Sun load sensor or Ambient light sensor.

The solar, sun load sensor, or ambient light sensor detects the heat load of the sun, elevation and azimuth. It is used to adjust the amount and direction of the cooled air through the dash vents and to control headlights operation of the vehicle.

Do you need assistance with the sun load sensor in your car ?

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How to add oil to air conditioning compressor ?

how much oil does my car ac system need ?

how much oil does my car ac system need ?

The amount of auto air conditioning system oil and the correct type for the vehicle is vital to the life of the a/c compressor. Proper lubrication is a must for ac compressor long life. When the a/c compressor is operated ,oil gradually leaves the compressor, and the oil is circulated through the entire ac system together  with the refrigerant. After the air conditioning system is operated for the first time an oil balanced condition is reached in which a certain amount of oil is retained in the compressor and a certain amount is re-circulated through the ac system components with different amounts of oil depositing in them . If a component of the system is replaced after the system has been operated, we need to compensate for this by adding oil to the new replacement ac part.

HOW AN OVERCHARGE/UNDERCHARGE A/C OIL CONDITION AFFECT THE A/C SYSTEM?

Too much oil in the a/c system could result in extremely high head pressures which will cause poor air conditioning performance and premature wear and failure of the hvac compressor. If there is a surplus of oil in the system, too much oil circulates with the refrigerant ,causing the cooling capacity of the system to be reduced and the compressor head pressure to increase. Too little oil results in poor lubrication of the compressor and an increase in the heat of compression which shorten the life of the ac compressor.

OIL BALANCING AN AC SYSTEM

When there has been excessive leakage of refrigerant, or it is necessary to  replace a component of the refrigeration system oil balancing is necessary to assure that the total oil charge in the system is the correct one after the leak has been repaired or the new ac part is installed in the car.

HOW TO OIL BALANCE MY CAR AC SYSTEM

The recommended procedure step by step

  1. Measure the oil recovered from the system while recovering the refrigerant prior to part replacement
  2. Drain and measure the oil left in the old part
  3. Drain the new part(if factory oil-prefilled)
  4. Refill the new part with the same amount of oil removed from the old part and the amount of oil recovered from the system
WHAT TYPE OF OIL ACCORDING TO TYPE OF REFRIGERANT R-12 R-1234YF AND R-134a

The refrigerant oil required by the automotive ac system depends on a number of factors ,but it is primarily dictated by the type of refrigerant used in the system.R-12 car systems used a mineral oil. Mineral oil mixes well with R-12  without breaking down and losing its lubrication characteristics. Mineral oil however cannot be used  to lubricate ac systems with R-134a refrigerant.R-134 systems require a different synthetic oil,polyalkylene glycol (PAG).There are different blends of PAG and POE oil; always use the recommended by the vehicle manufacturer or the replacement part manufacturer.

The lubricant oil used in automotive air-conditioning systems is a non-foaming, sulfur free grade specially formulated for use in cars a/c systems. New refrigerants like R-1234yf might use PAG 46 and are backwards compatible for use with R-134a systems, but the R-134a old PAG 46 oils are not forward compatible with R-1234yf systems.

OIL RECHARGE AMOUNTS
REFRIGERANT OIL Recommended PAG oil: DENSO ND-OIL 8  
Add the recommend refrigerant  oil in the amount listed if you replace any of the following parts:
A/C condenser(including receive Dryer. 25 mL (5/6 fl oz)
Evaporator 40 mL (1 1/3 fl oz)
Line or hose 10 mL (1/3 fl oz)
Receiver/dryer 10 mL (1/3 fl oz)
Leakage repair 25 mL (5/6 fl oz)
A/C compressor For A/C compressor replacement, subtract the volume of oil drained from the removed A/C compressor from 82 mL (2 3/4 fl oz), and drain the calculated volume of oil from the new A/C compressor: 82 mL (2 3/4 fl oz) - Volume of removed A/C compressor = Volume to drain from new A/C compressor.
NOTE: Even if no oil is drained from the removed A/C compressor, do not drain more than 50 mL (1 2/3 fl oz) from the new A/C compressor.

NEED ASSISTANCE

How long should an air conditioner compressor last in a car?

How long should an air conditioner compressor last in a car?

The air conditioner compressor should last the entire life of the vehicle. The car ac compressor damage is usually a sign that something else in the cooling system or car ac system is not operating properly and is negatively impacting the auto ac compressor operation.

There are multiple ways to ensure the auto ac compressor last for the entire life of your vehicle.

Do you need to get the ac compressor in your vehicle checked up before it gets damaged ?

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How can i make my car ac colder

What are the symptoms of a bad fan clutch?

We need the fan clutch to cool down the vehicle ac condenser in order to allow the refrigerant condensing and subcooling process to happen as efficiently as possible. A bad fan clutch will decrease the vehicle a/c performance.

Symptoms of a bad fan clutch and air conditioning impact.

  • Excessive high a/c system pressure.
  • Hvac compressor safety relief valve venting refrigerant.
  • Low a/c system refrigerant condition.
  • A/C system underperformance.
  • Air conditioning hose and lines damage.
  • A/C compressor damage.
  • Subcooling and de-superheat inefficient
  • Overall poor a/c performance.

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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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