ac low pressure drops to zero when running

When the fan becomes damaged, airflow through the condenser is Both gauges are reading zero. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. 4. Your results now are void if you are low on freon. In other words, the compressor is sucking, but theres nothing to suck. Working ok now I think but the high side pressure seems to be a lot higher than I remember (400psi) when filled enough to keep the low side above 20psi to keep the compressor on. Take a look at the temperature/pressure chart for your HVACR system for the specific refrigerant that you are using; you'll need to know the ambient temperature as well. The filter looks like a small air filter from a car. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. This could be normal if outdoor temperatures are very high. Refrigerant Type: 134A. Which switch are you referring to?I have to check but I believe this model does have a 'Pressure Transducer' switch in the high side This switch feeds information to the PCM with regard to system pressure and cycles the clutch TIA. @Freeman, its not about tonnage. Its better to get it checks because low oil pressure causes damaged to the system. 98,000 miles Low side drops to around 20-25ish. - defective or mechanically-damaged copper tubing Adjust your Low Pressure control to stop before it hit 0 psi. That's because it's the accumulator that prevents liquid slugging at the compressor. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. When all of these components appear to work fine and the AC low side high, high side lowproblem persists, you may need to change the compressor to fix the unit. Alldatadiy.com, on the other hand, uses the factory diagrams. WebThat is the reason why the oil pressure drops to zero while driving. This article is accurate and true to the best of the authors knowledge. Without knowing static pressure this is a guess. But if you see the AC low side high, high side low , such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. Answer: Does the compressor kick on with the front ac on only? I'm thinking a bad compressor could this be right or something else? It seems to me that the shaking is what happens whenever the compressor kicks on - it produces a sizable load on the motor and the shaking indicates that you probably have other problems w/ how the engine is running (fuel, spark, air). The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . (A-1 Compressors 2009). If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side only charging hose setup. Also suspect the switch.Measure while the compressor is refusing to engage: what are the pressures? The result is hot air out the vents. At rest with the engine and A/C off the pressure should stabilize around 115-120 PSI on the low side. Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. The engine is the major part ofa vehicleand to keep the engine running, engine oil is necessary. Route checkups prevent major problems. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. I don't have a tool to monitor the High pressure side. 1. It could also be a failed thermal bulb that is unable to pick up the temperature signals or the TXV stuck to the open position. Ambient temperature 30 degC. Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? Check for debris on the orifice tube screen. Before deciding to replace the compressor, other components that you may check are the pressure switch, expansion valve, and the compressor clutch. Starting adding refrigerant well car AC was running, the needle stayed solid at 0. The blockage or stuck expansion valve restricts the flow of refrigerant into and out of the evaporator. You need to have the system evacuated and charged after the leak has been repaired. Secondly, evaporation can cause the oil level to drop. Why would my Dodge's AC pressures be so different? link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. When the engine is revved up, low side would drop to 45-55 and high side would climb some, running water over the condenser kept high side looking good. Fix: None needed. If not, the compressor may be worn out. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. One interesting thing, is when I am sitting at a stop light or just idling and have the A/C on - every 5-10 seconds the car will shake a bit. Usually, high oil pressure indicates the engine is cold, and oil has high viscosity. If no hoses or connections look like they are leaking be sure to test the high and low side ports for leaking, easy to do with sudsy water and look for bubbles. 3. I believe I had the AC set to max when trying to add some. Is the center hub turning? When the oil level bot changed regularly, the oil level can drop. Record the pressures. It means that the engine has a low oil level. Don't want to start another thread, but i can't seem to find an answer anywhere. I would do an evacuate and recharge first, then do a pressure check. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. An oil pump is an essential part of the lubricating system. The system is overcharged. The switch is located near the expansion valve. Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. Oil pressure gauge goes up and down while driving. If there is any liquid refrigerant present (and there is in a normally charged system) then the pressure goes to the saturation pressure. If the system is continuing to cool it may be doing so at reduced capacity, observed as a loss of up to ten degrees of temperature drop across the coil. Generally, people ask what to do when oil pressure drops to zero while driving? With the compressor Our Comment Box is provided by Countable Web Productions countable.ca, Click to Show or Hide Citations & References, ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPS, Air Conditioning & Heat Pump Design, Inspection, Repair Books, Modern Refrigeration and Air Conditioning, Refrigeration and Air Conditioning Technology, Air Conditioning Inspection, Diagnosis, Repair, Efficiency, HOME INSPECTION EDUCATION COURSES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, "Refrigeration & Air Conditioning Guide: A-1 Compressor: Compressor troubleshooting guide, understanding the cooling cycle", A-1 Compressor, Inc., Horace Park, 2009, original source: http://www.rpctubes.com/images/CompressorTroubleshootingGuide.pdf. Once the system is too low it should fail to kick on. You can't really rule one thing out over another, but by your description, I would think if the blockage was in the condenser or O tube, the high side pressure would rise fast, but I could be mistaken but I think if it was a bad expansion valve you would see abnormally high pressure on the suction side if the valve we're stuck open and abnormally low pressure on the suction side and high on the high side if the valve stuck closed. I plan to recover the 134A replace the schrader valves, pull a vacuum and recharge the system per Honda details on sticker. I'm here for knowledge and to maybe give some. What The Dash Lights Stay On After Key Is Removed Mean? He is also providing training to mechanics and works as a Senior Mechanic of a well-known organization. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Answer: Never seen this before. Didnt read anything on here about normal high side but high low side. 3 (2010): 510-520. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. The compressor is the component of your AC system that generates the pressure that your cars coolant or refrigerant So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. This is the second part of a series on AC pressure gauge readings. I evacuated the system to get ready to add 134a. In this case, the reason is a damaged oil pressure gauge or sensing unit. If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components Change in viscosity of oil can cause damage to the oil pump. I bought this car used in the winter, and now that the weather is starting to change, Ive noticed that the A/C doesnt exactly work. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Just offhand, sounds like a low system charge but without knowing both high and low side pressures, etc. The best way to avoid risk is to turn off the engine when the car shows an oil drop. If youre tracking down a wiring issue, Eautorepair.net is the better choice. Sounds like the cycling switch if one is used. No hot water valve is needed because in cool mode the door closes off airflow through the heater core. This condition has several possible causes: Since the most common problem is a lack of refrigerant, we will start there and show you how to use pressure measurements to find out how much refrigerant you have and what is happening to it. Model: Accord EX. A dirty evaporator. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. Generally, this is not a good sign, it needs attention. Pros and Cons of Radiator Stop Leak - The Details. Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. Adj. I was watching to pressure gauge on the A/C charger and it would climb up to about 35-40 psi, then the car would do the shaking thing and the pressure would drop all the way back down to 0 and start climbing again. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Im completely stuck. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. 1 (1997): 33-42. I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. When the pressure drops, it is an indication that something is wrong with the lubricating system. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. Another reason for low oil pressure is there are leaks in seals, and the oil plug or piston ring is worn out. Pressure High: 65. new install. Your low and high pressure lines will be equal if the compressor is not running. He is sharing his knowledge to support the car lovers to solve the vehicle issues. If the center hub is turning, the compressor is not pumping. If the valve sticks closed, there will be no heat. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. In this article series we explain how overcharging or undercharging of refrigerant in an air conditioner or heat pump is detected and we list the effects of overcharged or undercharged refrigerant. Start the engine and turn on the air conditioner. Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. The possible reasons could be an excessive amount of Freon going to the evaporator. Is compressor bad? Engine coolant levels will be low. But the high side is extremely low. Question: I have a 1998 suburban with rear a/c. Use the leak tester for larger leaks and the dye with a black light for smaller leaks. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. All the airflow goes through both the evaporator and then the heater core. It is not turning on and off at all, just constantly running. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. Is voltage being applied to the clutch coil? The problem is that the defective oil sensor gives a false reading. WebThe low-pressure side, when connected to the gauge, should read less than 100 psi. Question: The A/C compressor has seized on my 2000 Sienna. Pull a vacuum to remove all moisture. Question: Why does the ac cut off every time I make a turn? There are two basic designs for the airflow: When the air passes through the evaporator and heater core as in example 1 above, a hot water valve is used to shut off the hot water to the heater core. Answer: The system can't be zero on the high side. During AC COLD operation, the blend door routes the cold air around the heater core. If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. Evacuate and check for blockage. If the air conditioning isnt blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. - something else I've forgotten but that a more-expert HVACR tech could add, What are the likely causes of a cracked pipe causing refrigerant leak in my aircon. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. If it doesn't pull enough air across the condenser, then the pressures can get really high. When the compressor runs the pressure drops - a lot. - corrosion If youre tracking down a wiring issue, Eautorepair.net is the better choice. "Theoretical study on separate sensible and latent cooling air-conditioning system." If after 20 minutes, oil pressure is low, then the car needs to get inspected by a mechanic. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. What was the ambient temp? when you have abnormally high refrigerant pressure on the low side or suction side I suspect blockage in the refrigerant line or failed thermostatic expansion valve, What happen the low side very high pressure, Anon What happens when the system runs, do the gauges both move? 04-09-2005, 01:47 Vacuum seemed to hold stable at about -25psi for 45 minutes or so so I went ahead and recharged. This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. Bad AC Compressor. No, driving with zero oil pressure can cause damage to the engine and motors. The evaporator and suction line don't get cold at all? So,a car needs a visit to a mechanic. Usually, the high side is really high and low side really low. Low side pressure is controlled by the H-block. I tried recharging the A/C today and found out another thing. Question: I have a 1998 Monaco motorhome. Replace expansion valve, flush and install in-line filter. Question: I charged the A/C system. Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. Answer: By the temperature in and out. It is better to consult a mechanic. The filter may be located under the dash or on the heater box in the engine compartment. Delmar Thomson Learning, 2009. driveaccord.net is not in any way affiliated with Honda Motor Company. when you have abnormally high refrigerant pressure on the low side, Wilson "Air-conditioning servicing system and method." Sequence: 1. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Compressor clutch not engaging after blower resistor replacement, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN.

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