Technician A is correct because if thermal protector fails the B+ path to the compressor clutch is open and it is the most likely cause. Refrigeration System Diagnosis and Repair - Compressor and Clutch, Refrigeration System - Evaporator, Condenser and Related Components, Heating and Engine Cooling Systems Diagnosis and Repair, Operating Systems and Related Controls Diagnosis and Repair, The Complete A1 - A8 Practice Test Kit with 800 Questions, The A7 Practice Test Kit with 100 Questions and Complete Task Coverage. Any attempts to drive your auto under those circumstances could cause severe damage to the engine, as if the belt breaks due to heat and friction of the frozen AC then none of your other components that rely on the belt would continue to function and that could be costly. B is wrong because high low-side and low high-side pressure indicate internal compressor damage. Please also note the following information: Your Koldfront air conditioner has a temperature sensor located on the front of the unit near the air intake port. Our heating and air conditioning experts serve Chico, Paradise, Oroville and surrounding areas. The air conditioner … System evacuation will not remove all of the moisture in the desiccant of a receiver/dryer due to its enclosure. Good maintenance will help prevent AC problems, but a system may still malfunction over the course of a cooling season. The most common problem experienced when turning on your auto’s air conditioning system is a lack of cool air or an intermittent level of temperature. C is wrong because when both high and low-side pressure are low you can have the following faults: low charge, suction line obstruction, clogged orifice tube, stuck closed TXV valve and restricted line from the condenser to the evaporator. Question: Question 4 Avengers Sdn. Bhd. Collecting Initial Information Turn the air conditioning on while the car is running. Acura questions (3,063) View all. I also work very well with other workers and can solve problems easily with a team." In another section on AC Maintenance and Recharging we discuss how your system works and give you advice on maintenance, now here is a troubleshooting section and checklist to help save time and money on diagnosis and repairs for your cars AC system. 10 Air Conditioning Mechanic Interview Questions. Questions by Make. Who is right? This check can be performed with the engine running and your AC turned on to maximum by raising the hood on your auto and doing a visual and audio observation. There are many possible reasons for this but the most common in newer cars is simply a low Freon level. Please choose another answer. Air conditioners are complicated mechanical systems with many working parts. Hoses must be connected and tightened properly, the belt has its own specific location to turn the unit, and various connectors for the AC recharge to function. Home; HVAC Basics. Practice Test was written by Dr. John Kershaw, an ASE test prep expert: ASE test question developer; ASE Certified Master Technician; ASE Master Truck Technician; and Auto Industry Technical Instructor. Auto AC Repair. Moisture. Whether it’s taking too long to cool the air inside your car or your windows are not defogging properly, some of your car’s air conditioning problems can become costly if … Replacing the air conditioning compressor is one of the most common major repairs. If the fuse associated with your A/C system goes, the power to certain parts will stop. An inoperative condenser fan can cause a high high-side and high low-side reading. Aftermarket Car Warranty – Should You Buy? The most likely cause of an automotive air conditioner cooling problem is no refrigerant in the system. Technician A is wrong because both heater hoses should be hot. Faulty compressor clutch: If the clutch is not engaging with your compressor, than your compressor can’t maintain the correct pressure. All auto AC repairs should be performed by a mechanic certified by the ASE in automotive air conditioning systems such as those at All State. Getting your vehicle ready for back to school. Below are some common AC repair issues and their fixes: Refrigerant leaks. An air conditioner lowers the inside temperature of your vehicle. Manufactures Auto Accessories. Both technicians are correct. Hot air will result. Technician A is wrong because a stuck thermostat causes overheating resulting in high temperatures and plenty of heat. Check battery. It also cools, dries, and … Courtesy of Toyota, When both the low and high sides are high, this indicates a refrigerant overcharge or restricted condenser. When your car’s air conditioning stops working, it can be exceptionally frustrating. If the refrigerant has escaped past a leaky compressor or O-ring seal, leaked out of a pinhole in the evaporator or condenser, or seeped out through a leaky hose, the leak needs to be identified and repaired before the system is recharged. If the clutch is frozen you should immediately turn off the AC and restart your engine. The following auto AC troubleshooting guide, tips and worksheet will help to save you time and money once you schedule your AC check. Air Conditioning Quiz Questions. C is also wrong because a stuck open thermostat will not cause overheating. But a warning – for safety, do not reach inside of the engine compartment at any time or touch any moving parts or get clothing near moving parts. … If the serpentine belt that is connected to the AC that spins the pulley is still frozen then immediately shut off your engine and call All Car Specialists right away. All automotive air conditioning systems are (nearly) closed loops with a high-pressure side and low-pressure side. Answer option A is not a most likely cause because a constantly running cooling fan will not cause overheating. If you have any questions at all, you can always give us a call or come by our shop. To hicho Heu 35 AT T BIC. Explain how you can keep your car in good condition? This troubleshooting checklist and visual/audio examination is not designed as a complete diagnosis, but rather a visual observation once you have made note of the symptoms on your checklist. All-Car…. Technician B is wrong because the high blower is controlled by the high blower relay not the resistor trio. An automotive air conditioning system works a lot like the AC system that you have at home or the office. With power and a ground, the clutch should have worked unless the gap is too wide, and is the most likely cause. While you will not be able to perform specific tests in troubleshooting your AC’s problem before you come into the shop, (and by the way, you shouldn’t attempt to do so), there are a few things you can look for and make note of in checking for a more serious obvious problem. The next time you have questions about your heating and air conditioning system or home maintenance issues in general, remember Experts In Your Home. Technician B is wrong because an overcharge will cause the compressor outlet to be cold. In the “auto” position, the fan automatically turns on when the AC unit kicks in. All Car Specialists is now equipped with the latest EIS 5000 Advanced AAA and BAR approved SMOG System for Expanded Years -Makes – Models – Hybrids. There are however other instances where the problem may be due to any of one or more different functions or parts malfunctioning. The AUTO indicator will remain illuminated. The Experts on JustAnswer have handled many thousands of questions and resolved problems, including: Besides oil changes, what else can I do to maintain my 1998 Toyota Camry so that it lasts longer? Some of the more common are small leaks in the system such as hoses or connector valves in the AC unit itself, the AC’s clutch could be malfunctioning. auto air conditioning troubleshooting guide. Use the key to start the car and … There are many reasons to ask a question let alone a car question. Community Answers "I am a very well educated and me hanically inclined individual. All Car wants to offer you some tips and guidance to help you and us determine what is wrong before you bring in your car. We are providing: Please call to schedule your appointment today! Car Questions. When the refrigerant is drawn into the compressor, it is in a low-pressure gaseous form. AC Orifice Tube / Expansion Valve. How can I tell if my air conditioner is broken? There are many things that can cause your car’s AC (air conditioning) to malfunction. Dr. Kershaw was among the first to receive ASE certification in 1972. The cabin temperature need to be at 23 C and the ambient air is 30 C. Design a system for this capacity. Find questions for your car. Problems with the air conditioning unit often develop over time, which is why it's important to schedule regular visits that include an A/C performance check. Why is my AC not working at all? Air Conditioning Quiz Questions Answers ) Search for: Related Pages. The AC orifice tube / expansion device filters and regulates the … Any one of these exhibiting a faulty connection or improper fitting could cause the unit to malfunction. The clutch is usually in the front part of the AC and should kick on and off at various times while the AC is on. 8°F) (Critical Temperature of CO) Temperature of passenger cabin. All you need when it comes to having an Automotive problem is a certified mechanic to be there for you will all the Free Auto Answers you need. By using these free ASE test questions and study guides, you’ll know where to focus on your Heating & Air Conditioning knowledge and know which study guides to review and practice. Instead just step back at a safe distance and look for the AC unit/compressor which should look something like the sample featured above, and do a simple visual/audio check of the unit looking for any signs of hose leakage, belt slipping or clutch activation or freezing of any moving part. Our expert diagnosis can save you both time and money. Ask an Automotive Expert. ASE defines heating and air conditioning as an individual service area. If that refrigerant is leaking from somewhere in the AC system it will become less effective at cooling the air before it leaves the vents. Identifying the Issue Start the vehicle and turn on the air conditioner. When that occurs we tend to lok to someone with experience for answers. One of the typical reasons air conditioners don’t work properly is a clogged or dirty filter. Courtesy of Toyota. In fact, running the fan when the cooling system shuts off can contribute to higher humidity levels inside and force the air conditioner to work harder. Technician B is right because when the system is low on coolant there is insufficient material to transfer the heat. If the cool air has stopped flowing, the first thing you … Technician A is right because a misadjusted blend door affects heat. Answer option A is wrong because high high-side and low low-side pressure generally indicates a restriction evaporator air flow. Technician A is correct. Incorrect answer. One major potential problem that could be visually obvious right off is in the case of a frozen clutch-pulley and you her a squeal or see signs of smoke or unusual heat coming from the front of the AC as the belt tries to spin the clutch. Popular Models: Acura CL, Acura ILX, Acura Integra. Be sure to check out the automotive mechanic certification requirements by … Automotive knowledge includes things like basic history and understanding the difference between horsepower and torque, but there is a whole other side of cars that is foreign to many car lovers. A clogged radiator is the most likely cause because a restriction of any kind in the cooling system will cause an engine to overheat. B is not a most likely cause because a restriction heater core will cause no heat but not necessarily cause an engine overheat. Car air conditioning using CO2 We need 5 tons of refrigeration using a CO2 cycle as indicated. Your car's air conditioning uses refrigerant, a fluid designed to vaporize at a low temperature, to cool the air before it blows through the vents into the passenger compartment of the vehicle. Filter. The compressor of the car air conditioning system is driven by the crankshaft of the engine through the belt drive. The AC canister could also be defective, etc. PLEASE NOTE: When operating in AUTO MODE, the control panel display will NOT illuminate to indicate any change between Cool/Fan/Heat. In which case, a relatively simple and affordable system recharge will solve the problem. For complete test practice, flash cards, exam review and testing tips, check out: To avoid evaporator odor, you operate AC System in FRESH mode not RECIRC mode. Car Questions? Here is a quick look at how car AC systems work and how you can diagnose any problems with your AC system. All Car Specialists is a certified automotive repair and alignment shop in Los Angeles. Dr. Kershaw was among the first to receive ASE certification in 1972. Sometimes we find ourselves in a situation that we are not familiar with. Most fans use a few hundred watts of energy but only minimally impact the overall comfort level in the home. This area includes all components and systems both mechanical and electronic that are related to a vehicle’s heating and air conditioning system. We'll start with the high-pressure side as it leads from the engine to the passenger compartment:. Get the car support you need, or join and help others solve their car repair problems. Air Conditioning Questions: Common AC Repairs. It serves one very fundamental purpose, as well, and that is to cool you down. Your car’s AC System may be something you take for granted — until you encounter a problem. If you live within 5 miles, we will pick up your car for service. … Why is the valve lifter on a 2007 Silverado pickup truck going bad, even after we just replaced it? Ask a mechanic for help and get back on the road. Well it's that time again, when school…, Aftermarket Car Warranty Sales Pitch vs Sales Hitch Consideration If you buy a new car,…, All Car Specialist has been servicing Diesel vehicles for the past 20 years. Technician B is right because the upper radiator hose should be too hot to hold. The blown fuse scenario: Fuses sometimes short out. Technician B says when replacing O-rings you lubricate the O-ring with the correct refrigerant oil to prevent nicks and ease installation. One Of The Company's Products Is A Set Of Seat Covers That Can Be Adjusted To Fit Nearly Any Small Car. A stuck expansion valve is the most likely cause based on both high and low pressures being low. Compressor: The compressor is a pump driven by a belt attached to the engine's crankshaft. GO P2-72 Mpa 450 ha Ambice temperature. Condenser – It is the device looks like a small radiator and is used after the compressor as it provides condensing i.e. Get answers to your auto repair and car questions. Looking for a particular question? I learn very quickly and am eager to perform well, and gain knowledge about the trade. Copyright © 2009-2021 Tests.com LLC - All Rights Reserved. Feel free to ask automotive related questions and get the answers to all your car related issues. The most common problem experienced when turning on your auto’s air conditioning system is a lack of cool air or an intermittent level of temperature. When the expansion valve is stuck closed, both high and low pressure are low. The clutch should not be engaged when the AC is turned off. Tips on Preventative Maintenance for Diesel Vehicles. The following auto AC troubleshooting guide, tips and worksheet will help to save you time and money once you schedule your AC check. We are open as an Essential Business and we are adhering to CDC guidelines for Covid-19. Tests.com's ASE A7 Practice Test was written by Dr. John Kershaw, an ASE test prep expert: ASE test question developer; ASE Certified Master Technician; ASE Master Truck Technician; and Auto Industry Technical Instructor. All Car Specialists use the most modern technology available that help save you money and speed up your repair by locating the exact problem as quickly as possible so the repair can be performed in as short as time as possible, getting you in and out without needless guess work. The Company Has A Standard Cost System In Use For All Of Its Products. Fast Testing and Certificates Serving San Gabriel, Arcadia, Pasadena, Pomona, Monterey Park, Monrovia, Temple City, Rosemead. AutoMD answers your auto repair questions by giving free help and advice from our community members. Why should we hire you? Technician A says all air conditioning connections use a gasket or O-ring to seal the system. Often there are signs that there's an issue with the A/C system and that a repair might be necessary. Regular check-up of parts like. Re: AC restoration questions, '93 Mazda RX7 Post by pete_89t2 » Mon Oct 12, 2020 10:52 am bohica2xo wrote: Barrier hose will be a snug fit, but it should be anyway. Technician B is wrong because temperature door position does not affect compressor operation on a manual system. 2. In our Online Automotive HVAC Essentials Certificate Program, you’ll take HVAC classes and learn automotive engine heating and cooling systems, air-conditioning systems basics, rules, EPA regulations, and safety practices for working with refrigerants, and how to troubleshoot techniques of automotive heating and air-conditioning assemblies. If your AC just doesn’t work, period, your first line of defense is to … A quick look at a typical modern auto AC compressor shown above shows the many different elements that must be connected in order for the compressor to do its job. Car Questions and Answers . A specific engine temperature is needed to consume all of the pollutants. During this time, we are taking precautionary measures for our customers and our staff. Appointment today the most likely cause of an automotive air conditioner lowers the inside of... 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