Tag: auto ac repair near me

Different types of oil

how much oil does my car ac system need ?

how much oil does my car ac system need ?

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

The AC compressor should last for the entire life of the car,usually 8-10 years.

System maintenance and compressor efficiency

 
The compressors efficiency can be improved by maintaining the correct working conditions. This involves keeping the suction pressure as high as practical and the head pressure as low as practical within the design parameters.
A dirty evaporator will cause the suction pressure to drop. When the suction pressure goes below normal, the vapor that compressor is pumping become less dense and gets thin (sometimes called rarified vapor).The compressor performance declines. Low suction pressures also cause the high-pressure gases caught in the clearance volume of the compressor to expand more during the pistons downstroke.This gives the compressor a lower volumetric efficiency. These gases have to expand to a pressure just below the suction pressure before the suction valve will open. Because more of the downward stroke is used for reexpansion, less of the stroke can be used for suction. Suction ends when the piston reaches bottom dead center. Low evaporator pressures cause high compression ratios.
Dirty condensers also cause compression ratios to rise, but they do not rise as fast as with dirty evaporator.A dirty condenser makes the head pressure to rise. This causes the amount of refrigerant in the clearance volume (at the top of the compressor cylinder) to be greater than the design conditions allow and the compressor efficiency to drop.
If there is a dirty condenser (high head pressure) and a dirty evaporator (low suction pressure), the compressor will run longer to keep the refrigerated space at the design temperature. The overall efficiency drops.
Evaporator core and condenser core maintenance will increase the life of the air conditioning compressor,improve the A/C efficiency and cooling capacity.With regular A/C maintenance we are saving money in the long run and getting the most out of the air conditioning system.

Different types of oil

Air conditioning system oil type and balance

Type & balance of air conditioning systems

Auto AC Compressor service

Analysis of Denso A/C Compressor warranty claims show that in a quarter of all cases
the use of incorrect oils, such as universal oils or oil mixtures, inevitably leads to seizure and damage. This is because universal oils, are PAO-oils or mineral oils with a different viscosity to that of synthetic PAG-oils. PAO-oils do not mix well with PAG-oils and with refrigerant R134a or R1234yf, leading to poor lubrication and increased wear.

Air conditioning oil properly recharged and balanced.

Installing the Compressor without balancing the oil in the system , gives a high risk of liquid lock, due to too much oil in the A/C system!

Give us a call at 786-483-9406

Auto A/C Repair LLC. offers a comprehensive and very convenient ac repair mobile service. We come to your home or office and you can go on with your normal day. All we need is a driveway or parking space where our technicians can work.

EPA Regulations

Proper ac service on site in miami-dade county by auto ac repair llc

ac not cooling.How to properly recharge your ac system.

Any person that services Motor vehicle air conditioning must besection 609 and section608certified. Section 609 of the federal clean air act, is regulated by the United States Environmental Agency (EPA).Failure to comply could cost you as much as $37,500 per day, per violation, and there is a bounty of up to $10,000 to turn you in. The total penalty cannot exceed $295,000 unless EPA and the Department of Justice determine a greater penalty is appropriate.
After system evacuation and dehydration the system can be charged with new or recycled refrigerant. The system must be critically charged. (exact pounds and ounces). At Auto AC Repair LLC. we have many customer complaining that their ac is not cooling after they’ve tried to top off the system with the famous ac refrigerant cans.An incorrect system charge reduces efficiency and comfort and could cause severe damage to your ac system.
The only accurate method to charge a system is to weigh the refrigerant into the system.
Call Auto A/C Repair LLC. today for free estimates
Ph: 786-483-9406.
Let us take care of your car.

Auto ac repair in miami Free estimates and check ups by ase certified tech

DEFROST MODE

Defrost Mode.Damage to compressor due to low refrigerant charge.

On many vehicles, by selecting the defrost position on the controls, it will also activate the A/C compressor. Cooling the air with A/C first will remove more moisture from the air so it can do a better job clearing the windows.If the A/C system is not functioning correctly this ability will be lost. If your A/C system is not working 100%,with low refrigerant charge over the winter months, youre not getting the refrigerant oil back to the compressor which is damaging it all winter season that will lead to costly repairs in the spring time. If you run into any issues regarding this system have a professional mechanic from Auto A/C Repair. help you diagnose and fix it.
Call Auto A/C Repair LLC. !
Ph:(786) 483-9406

Hyundai Sonata 2003 2.7 l

Main seals compressor replacement.

In some cases you don’t need to get the whole compressor replaced and spend a lot of money in the process!!

The hvac compressor is designed to last for the entire life of your vehicle andsometimesleaking compressors shafts sealscould be fixed by only replacing the seals.

Avoiding inactivity of theA/C system forlong periods of time is the best wayfor keeping the main seals lubricated and to prevent the compressor shaft seals to dry up again.Save money and time,give us a call at: 786-483-9406. Auto A/C Repair LLC. for a free check up and estimate.

IN CABIN AIR FILTERS

Auto ac repair in miami in cabin air filter replacement in miami-dade county

In-cabin air filters.

 
The primary purpose of cabin air filters, located on most vehicles since 2000,is keeping the air inside your vehicles cabin clean.
Its typically located behind the glove compartment or under the hood or dashboard on most modern vehicles. Its job is to filter all of the air that comes through the cars hvac system to prevent pollutants, such as dust, pollen, smog and mold spores from entering. The filters can also catch rodent droppings, leaves and other unwanted debris.
If you dont change it, the filter could get clogged with dirt, dust, smelly mold and allergens, and can even impact the performance of your defroster and your heating and air conditioning blower motor.
Most manufacturers recommend removal and replacement of your cabin air filter once a year or after 12,000 to 15,000 miles of driving. However, this is just a rough guideline. If you routinely drive in places with poor air quality, like the desert where its dusty or urban areas with smog, then you may need to replace your cabin air filter more frequently.
If youre having trouble finding a new filter or locating your old one inside your car, give us a call at (786) 483-9406 Auto A/C Repair LLC well be glad to help you.