Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. 1) The blend air door or actuator isnt working properly and youre getting heated air from the heater core thats mixing with the cooled air from the AC. Answer: Not enough information. Was a click heard when the AC was engaged? High side was about 250. Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. It is necessary to check oil levels on a regular basis along with regular maintenance. Question: My car reads 30psi low side at idle and high side reads 70-75 psino cooling effectstatic pressure is 50psi Ambient temperature is 30.c Is my AC is undercharged? (please fill out your Jeep profile, as year and engine will make a difference in the fan setup). Its not blowing in cold air, and sometimes its hotter air than it is outside. Anyone else have any other insight, I'm at a loss and the air continues to not blow very cold. cool at best. Open the low side valve on the manifold gauge set. If there is a drop, there may be a restriction at the TXV or orifice tube. If youve attached gauges to your cars AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. I vacuumed the system and put new refrigerant. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). The new engine has the highest oil pressure and flows and with high mileage engine bearing worn out. There could be several causes leading to this condition including compressor issues, low-level of refrigerant, trouble with the heater or AC controls, and others. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. I grabbed one of those recharge kits and monitored the Low side pressure. Replace expansion valve, flush and install in-line filter. Lets look at some causes of low or zero oil pressure. Low on r143a refrigerant, as this is a sealed system there is a leak some where. Both gauges are reading zero. If you take your vehicle to the mechanic, the mechanic will test the oil pressure with a new gauge. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? 2002 Mazda 626 2.0L 4cyl. (very common especially if youve tried to add refrigerant yourself). No. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. I am sure it will cycle if all that is wrong is low freon. Low side drops to around 20-25ish. Ambient temperature 30 degC. Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. And no offense was taken. Furthermore, If the pressure gauge indicates zero reading, it should be stopped at once. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). Question: I have a 1998 suburban with rear a/c. Come join the discussion about performance, engine swaps, modifications, classifieds, troubleshooting, maintenance, and more! Question: I can't turn off my a/c. Thanks. 2. The A/C gauge reads zero pressure on the "low side." Since it does cool I would think it is close to being charged. 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. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki. It was 85 outside and I'm guessing about 40% humidity. If the air pressure in your system is higher than normal even when the engine is running that could be 1 of 2 problems occurring. Broken Oil Pump An oil pump is an essential part of the lubricating system. How are you going to do that? Answer: Sounds like poor airflow across the condenser. Update, tried to add some of that refrigerant AC-PRO stuff. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. I pulled a vacuum on the system prior to charging. I also agree with the others that you might consider getting an A/C shop to look at this as A/C work can be a bit dangerous on top of causing even more damage to the system. A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. Lower pressures may indicate low refrigerant level or a weak compressor. InspectAPedia tolerates no conflicts of interest. A dirty evaporator. Question: How do you tell if the condenser is restricted ? You will notice blue smoke coming out from your car exhaust. If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. 50 psi on low pressure and 180 psi on high pressure with an outside of temperature of 75F, what does this mean for diagnostics of an AC system? With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. He is sharing his knowledge to support the car lovers to solve the vehicle issues. There is a relationship between the pressure in the system and temperature. I'm thinking a bad compressor could this be right or something else? It could be an issue with the orifice tube too. Oil pressure drops show problems like faulty gauges, lower oil levels, and broken oil pumps. Smaller air conditioners or refrigeration equipment whose design does not include a refrigerant accumulator are at increased risk of damage from overcharge, liquid slugging, or oil circulation problems. However, a radiator leak can occur if one of these components goes bad. Hot in, cold out is restricted. After the system runs for a while, raise the RPMs up to about 1,500. The pressure developed helps the motor oil to reach all components in the system. What was the ambient temp? Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. Answer: 2020 Mustang should be R1234yf refrigerant. 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. Charge system until gauges read over 50 pounds of Mazda Miata convertible tops are the great way to enjoy the warm weather and convert your Miata into a convertible vehicleissue.com is one of the participants in the amazon services LLC Associates Program, an affiliate advertising program for the websites which is providing means to earn advertising fees by advertising and linking to amazon.com. Did it speed up? Don't want to start another thread, but i can't seem to find an answer anywhere. Cengage Learning, 2012. This could be normal if outdoor temperatures are very high. Adding refrigerant with the low side only can ruin the system..Didn't you say yopu suspect that in the last failure?? Charge with DYE and retest with a black light. So replacing the defective pump or gauge will be a good idea. A clogged filter leads to extended oil and thus result in poor combustion. 3 (2010): 510-520. Ambient Temperature in F Low side Pressure Gauge reading and High side Pressure Gauge reading 65F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi 70F Ambient temperature: Low side pressure 35-40 psi High side pressure 145-160 psi 75F Ambient temperature: Low side pressure 35-45 psi High side pressure 150-170 psi 80F Ambient temperature: Low side pressure 40-50 psi High side pressure 175-210 psi 85F Ambient temperature: Low side pressure 45-55 psi High side pressure 225-250 psi 90F Ambient temperature: Low side pressure 45-55 psi High side pressure 250-270 psi 95F Ambient temperature: Low side pressure 50.55 psi High side pressure 275.300 psi 100F Low side pressure 50-55 psi High side pressure 315-325 psi 105F Ambient temperature: Low side pressure 50-55 psi High side pressure 330-335 psi 110F Ambient temperature: Low side pressure 50.55 psi High side pressure 340.345 psi. Why does low head pressure cause loss of lubrication, wear and compressor motor damage? In other words, the evaporator core ices up and stop cooling. At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. Lets understand what In other words, the compressor is sucking, but theres nothing to suck. Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. Sounds like either a bad compressor or a bad H-block. It means that the engine has a low oil level. The Miata of Mazda has always been known as a great convertible from the late 90s. Pressure that is too much lower or higher shows there is a problem. Bad txv or tev. Engine coolant levels will be low. The dirt on this evaporator has restricted the airflow and caused a lack of cooling. It had this problem prior to replacing these parts. A forum community dedicated to all jeep owners and enthusiasts. It has a new compressor, orifice tube, and accumulator. PSI was around 60 off and 0 when on. Adjust your Low Pressure control to stop before it hit 0 psi. It is better to consult a mechanic. "You may want to invest in a torque wrench, since your torque by feel only consists of gorilla mode. However, if theres a restriction on the high side of the system in the receiver/dryer, a crimped tube in the condenser or crud accumulation in the condenser or the expansion valve or orifice tube, theres nothing to suck. Before starting, lets discuss why oil pressure is vital. Question: The A/C compressor has seized on my 2000 Sienna. Secondly, evaporation can cause the oil level to drop. Lets look at some causes of low or zero oil pressure. Identify the refrigerant before hooking up to a recovery machine. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." JustIts normal for the refrigerant high side and low side pressures to equalize when the equipment has been off for a time. Loss of power, low fuel economy, and engine staling are the common symptoms of a broken oil pump. Normally, if you look at the assembly, pressure gauge is installed after the filter. Usually, the high side is really high and low side really low. This may cause the AC or heater output to be reduced. Thanks for the input madmatt. To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. Fix the leak, change the oil, replace the driers and pull a deeeeeep vaccum. We've updated our forums!Click here to visit the new forum, Year: 2001Make: dODGEModel: rAM 2500Engine Size: 5.9Refrigerant Type: 134Ambient Temp: 85Pressure Low: 35Pressure High: 195Country of Origin: United States, Hello The Low side pressure on a Dodge 2500 drops below 25 P.S.I when RPM is increased ;thus the compressor clutch is shut down.. 1. What makes the coupler not to stay secure? That saves a lot of time because you dont have to refer back to the component locator or circuit locations. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. The high side reads 65 psi. Typically used on small engines. If the pressure is lower than in the chart, the refrigerant level is low. Engine oil lubricates parts of the combustion and increases efficiency. Shut the engine off and rotate the center hub by hand. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. The pressures are 30psi on the low side and 165psi high side. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed. Sounds like the cycling switch if one is used. Does the pressure match the temperature-pressure chart? If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable). Turn on car, turn on AC to max cold and add your refrigerant. How To Fix Sagging Headliner Without Removing In Less Than 10 Minutes! 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. The compressor clutch stays engaged and the pressure readings stay the same. Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like Open the low side valve on the manifold gauge set. Low side is way to high. I'll take a look at the clutch gap. compressor is a Sanden model U4833..Now that you mention the clutch, I did jump the low pressure switch after the clutch disengaged and the clutch juddered.. Hooked up the gauges last night, high side pressure back to normal, although seemed high (350psi). An oil pump is an essential part of the lubricating system. If this valve doesnt close, the AC cold air will be heated by the heater core. The systems with rear ac hold more refrigerant, usually about 3.8 pounds. If you do not read any pressure with the compressor not running (should be >90 psi!) I believe I had the AC set to max when trying to add some. What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. Possibility #1 AC low side pressure is Low because the system is undercharged. Also suspect the switch.Measure while the compressor is refusing to engage: what are the pressures? There are tools that will replace the valve cores with no r134a refrigerant loss. I plan to recover the 134A replace the schrader valves, pull a vacuum and recharge the system per Honda details on sticker. Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. Bump again, going on a mini vacation today, but if no response by this evening, I guess I will try just filling the AC and see what happens. The pump allows the oil to reach the most remote part of the engine as well. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. The engine oil moves through the lines and builds pressure. Is the cooling fan running constantly? So,a car needs a visit to a mechanic. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? A low pressure cut-off will prevent the CONF-960254--. I dont like running it that high. Is that normal? Similarly, the fan also has to spin when you turn the system on. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. However, thinner liquid requires less. Whats likely the culprit? Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Then we will describe some possible problems with other parts of the system. Answer: Wrong or damaged coupler would be my guess. I'll do that tonight. 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. @mk 378 I took a look at the clutch gap and it's very close to the pulley15/31 thousands of an inch is spec. Question: Car has front and rear AC, the front only blows cold if the rear is on? Oil pressure drops to zero is not a good sign. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Pressure Low: 0. 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. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. 1. Air Conditioning (AC) System Operation with TXV or Orifice Tube, Servicing an Auto AC System and Replacing Components, An electrical problem that prevents the compressor from turning 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 AC and heater operate out of the same box or plenum typically under the dash. When it's switched on it works great. What are the effects of low refrigerant pressure at the compressor or in the system? Cooling fan problem, plugged or blocked condenser are the probable causes. 1 (1997): 33-42. Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. System must be overcharged or your gauges are somehow connected wrong. Question: 2020 mustang air works when it wants to. When the car startup, it takes 20 minutes for a car to build oil pressure. Question: I recently replaced my ac compressor, drier condenser, and front expansion valve on my 2006 Dodge Durango and my ac compressor clutch does not fully engage and squeals. I tried recharging the A/C today and found out another thing. Without knowing static pressure this is a guess. "Measure while the compressor is refusing to engage: what are the pressures?' He has more than 15 years experience on repair and maintenance of different kinds of vehicles. Compressor turns on. When the compressor runs the pressure drops - a lot. 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. What should be my next step? The switch is located near the expansion valve. I would stop messing with it now and take it to an AC specialist. I flushed the lines with nitrogen and vaccumed the lines before. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. Answer: The system can't be zero on the high side. Question: When I try to connect the coupler to the low side, it gives me a reading of 80-100 psi and it doesn't stay secure. If the pressure is lower than in the chart, the refrigerant level is low. If the sight glass is clear liquid the system is fully charged. - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. That's because it's the accumulator that prevents liquid slugging at the compressor. Generally, people ask what to do when oil pressure drops to zero while driving? It creates problem for the oil pressure pump to operate effectively. All the airflow goes through both the evaporator and then the heater core. Evacuate the system and recharge with the correct amount of refrigerant. Turned off AC, and it climbed to what looks like 75PSI well off. Oil pressure gauge goes up and down while driving. WebThe low side pressure drops and fluctuates consistently between 20 and 40 psi during compressor cycling. The high- and low-side pressures should be equal. Anyone have any idea what the might be? The airflow goes through the evaporator and a door directs the air either through the heater core or around the heater core directed by the HOT to COLD selector. If the cabin filter is dirty, the result will be low airflow. Low Oil pressure is not a good sign; it can lead to engine failure. High side reading is normal but low side immediately pegged the gauge and didnt move. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. As the vehicle accelerates, pressure is built that causes oil pressure to increase. Oil pumps circulate oil throughout the engine. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC.
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