We take care of everything — brakes, tires, oil changes — all your auto repair needs Midas is committed to earning your trust by providing the expertise, value and responsiveness you expect. Full Service Auto Repair Center With nearly 1300 locations across the U.S. and Canada, Midas auto repair technicians can perform preventive maintenance and car repair wherever you are. Every Midas store is staffed by ASE-certified mechanics and we’re proud to have helped form the Motorist Assurance Program (MAP), an independent industry group that establishes best practices for automotive maintenance and auto repair.Midas offers complete auto care for your vehicle. Whether it’s time for your next factory recommended maintenance visit, a routine oil change, new tires, or repair services on your brakes, muffler and exhaust, suspension, air conditioner, or any other mechanical or electrical component of your car, Midas is in your neighborhood and ready to serve you. Trusted Auto Service Since 1956 For over 60 years Midas has been caring for cars and trucks in communities across the U.S. and Canada.

The first in the industry to offer written estimates before work was performed and the first to give customers a view into service bays, Midas has always stood by our pledge to do right by you and your car.Our famous Midas Lifetime Guarantee* on brakes, mufflers and exhaust, and shocks and struts means that we’ve got you covered, for as long as you own your car. window ac unit 24 000 btuWe don’t paint mufflers gold any more, but our word is as good as gold. daikin ac units for saleCount on your local Midas for all your car care needs. ac unit rlaTrust the Midas Touch®.*Most vehicles. See manager for limited guarantee terms. That's right, we're on TV! But you're surfing the web. No problem - check out our latest commercials right here.Building a future with SAIRAC Membership

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But if your A/C system has lost it's charge because of a leak, collision damage, or the need to open it to replace a compressor, hose or other component, you may have to convert from R-12 to R-134a when you recharge the systemBecause R-12 is no longer produced in the U.S. Supplies of recycled R-12 still exist, and some R-12 is still brought in from offshore suppliers. But it is hard to find and expensive. That's why many people simply recharge their older R-12 air conditioning system with R-134a after repairs have been made. Does it make economic sense to retrofit an older vehicle to R-134a if the A/C system has lost its refrigerant charge or needs major repairs? The older a vehicle gets, the more it depreciates. By the time it is 15 or more years old, it may only be worth a few hundred dollars. Many owners will not put any more money into an older vehicle unless the repairs are absolutely necessary to keep it running. Even then, it may be less expensive to get rid of the vehicle or to junk it than to fix it up.

Even so, A/C is something that's hard to do without especially during hot weather. Hot summer temperatures and high humidity can make driving in city traffic unbearable. A professional retrofit by a repair shop can cost hundreds of dollars, depending on what they do. But on many older vehicles, you can save money and do the job yourself - if you have some know-how and the right equipment. There is NO reason to retrofit a vehicle to R-134a as long as the R-12 system is cooling properly and contains a normal charge of refrigerant. A/C systems designed to use R-12 will cool best when charged with R-12 refrigerant. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative. Converting to R-134a typically reduces cooling performance somewhat, and may require some additional modifications depending on the vehicle model year. Where retrofit makes the most economic sense is when an A/C system requires major repairs such as a new compressor, condenser or evaporator.

The average repair bill to retrofit when other A/C repairs are needed, according to the Mobile Air Conditioning Society (MACS), is about $100 over and above any other repairs that may be needed (such as replacing the compressor, condenser or evaporator, etc.). The cost to retrofit usually does not add that much to the total repair bill because converting 1990s vintage vehicles to R-134a in most cases is fairly easy and does not require many (if any) changes. If the vehicle has barrier style hoses and the compressor and seals are compatible with R-134a, the only thing that has to be changed is the compressor lubricant. A retrofit can be done one of two ways. The first is to follow the vehicle manufacturer recommended retrofit procedure. This generally involves removing all the old mineral oil from the system, replacing the accumulator or receiver/dryer with one that contains X-7 desiccant, replacing O-rings (if required), installing or replacing a high pressure cutout switch (which many shops seem to forget), changing the orifice tube or expansion valve (if required), then adding the specified PAG oil and recharging the system with R-134a.

On some applications, installing a more efficient condenser may be recommended for improved cooling performance. After the modifications are made, the system is recharged to about 85 to 90% of its original capacity with R-134a. Federal law also requires the permanent installation of R-134a fittings on the high and low service ports to reduce the chance of refrigerant cross-contamination the next time the vehicle is serviced. Labels must also be installed to identify the system has been converted to R-134a. The other approach to retrofit is the "quick and cheap" one. On many 1989 through 1993 vintage vehicles, R-12 A/C systems can be converted by simply recovering any refrigerant that is still in the system, adding POE oil (which is compatible with both types of refrigerant), and recharging to 85 to 90% capacity with R-134a. A simple retrofit may therefore cost no more than a few cans of refrigerant and some compressor oil -- provided there's nothing else wrong with the A/C system.

But simple low cost retrofits may not give the best cooling performance, and may not even be possible on some vehicles. Any compressor that has Viton seals is not a candidate for retrofit. This includes original equipment compressors such as Tecumseh HR980, some Keihin compressors and some Panasonic rotary valve style compressors on older Japanese cars. On these, the compressor must be replaced. Compressor durability is also a concern with some vehicles. Because R-134a raises compressor discharge pressures and increases the compressors work load, some lightweight compressors may not be rugged enough to tolerate R-134a over the long haul. This applies to the Harrison DA6 and Ford FX-15 compressors. The Harrison DA6 can be replaced with a HD-6, HR-6 or HR-6HE compressor. The Ford FX-15 compressor can be replaced with a FS-10 compressor. Regardless of which retrofit method is used, cooling performance will vary depending on the design of the system. As a rule, expect anywhere from a 3% to 15% decrease in cooling performance when an R-12 system is converted to R-134a.

Systems with relatively large or efficient condensers will experience less of a drop in cooling performance with R-134a than those with smaller or less efficient condensers. One way to improve cooling performance when retrofitting an older R-12 system to R-134a is to install a "variable valve" orifice tube in place of the standard fixed orifice tube. These aftermarket variable orifice tubes allow the flow rate through the valve to change for better cooling at idle and low speeds. Such a valve can lower the A/C outlet air temperature by as much as 5 to 8 degrees, which can make quite a difference if the vehicle is crawling along in stop-and-go city traffic. Adding an extra cooling fan can help boost cooling performance, especially at idle and low speeds. Many older rear-wheel drive cars and trucks do not have a separate electric fan for the A/C condenser. They rely solely on the belt-driven fan for cooling, which may not be adequate in extremely hot weather with R-134a. Installing an auxiliary fan that comes on when the A/C is turned on give provide the extra airflow needed to carry away the heat.

Installing a larger or more efficient condenser can also help compensate for losses in cooling efficiency with R-134a. If the original condenser or evaporator is being replaced because of a leak, damage or defect, make sure the replacement unit has the same or better BTU rating. Some aftermarket replacement condensers and evaporators may not deliver the same cooling performance, and create a problem you did not have before. When a compressor fails, it can throw metallic debris into the system. Most of the junk ends up in the bottom of the condenser, but some of it can also be blown back into the suction hose. Flushing the condenser, hoses and evaporator with refrigerant or an approved solvent may remove most of the debris, but parallel flow condensers cannot be flushed effectively. Replacement is often recommended if debris is found in the system. Most experts also recommend installing an in-line filter (high side and/or low side) to protect the replacement compressor and orifice tube or expansion valve.

There are also filter screens that can be installed in the suction line to prevent any debris from reentering the compressor, too. The vehicle manufacturers still do not approve of any alternative refrigerants other than R-134a for retrofit, though a variety of alternative refrigerants currently meet the EPA SNAP (Significant New Alternatives Policy) rules for environmental acceptance. Most of these are blends that are formulated to replace R-12 in older vehicles. It is important to remember that R-134a or any other alternative refrigerant cannot be mixed with R-12 or used to top off an R-12 system. If an A/C system still contains any R-12 at all, it must be removed using approved recovery equipment (venting is not allowed) before a new refrigerant is added to the system. This is an absolute must to prevent cross-contamination of refrigerants and cooling performance problems. Mixing different refrigerants can cause big problems. For one, it will increase the system operating pressure.