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Air condition unit has constant high pressure which means something is blocking flow

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Hello there:
yes it does sound like a blockage you may need to take the car to an a/c repair shop and have them check the orfice tub and the compressor and also have them do a diagnoses on the a/c system too insure that there is no other blockage in the system....hope this will help you out the cost should not be more than $150 and that is if they evacuate the system and recharge it if they have too do repairs it may cost as much as $600 or more to repair....please leave a review sincerely D.Jones

Posted on Jun 02, 2010

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There is a high side and a low side if the low side has high pressure the ac has to to be taken to a qualified ac person to have it diagnosed.

Posted on Jun 02, 2010

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What is fault code SA 16 DTC PO 4D900


Looks like could be caused by one of several sensors.
I did find thisP04D9 EGR feedback saturation This OBD monitor indicates if the burned air fraction error is saturated against a high or low limit. The logic for the monitor evaluates the time spent at saturation and compares the ratio between the time spent in a saturation mode and the total time engine running. A fault is reported whenever the ratio exceeds the fault limit.
P04D9 EGR system: Feedback control(Saturated Low)
Enable conditions: Engine torque 300 - 2500NM,Exhaust Mass Flow 0.1 kg/s, Ambient Air Temperature-8 -55C, Barometric Pressure 75 - 105 kpa, Coolant Temperature>65 C
Disable Conditions No active DTCs P0069 P046c P0234, P0299, P0401, and P0402
Some possible causes
P0069 Intake manifold pressure sensor evaluation
P046c EGR differential pressure sensor: DP Sensor rationality
P0234 Comparison of actual boost pressure, Overboost, to modeled boost pressure
P0299 Boost Pressure: Underboost, Comparison of actual boost pressure to modeled boost pressure
P0401 EGR system (low flow)compare demanded egr flow to actual
P0402 EGR System (High Flow)compare demanded egr flow to actual

Aug 20, 2017 | Cars & Trucks

3 Answers

Engine runs rough and stalls sets a p0068 code on a 05 dodge durango


P0068-MAMFQLD PRESSURE/THROTTLE POSITION CORRELATION
' Image
Theory of Operation
This DTC sets when an unexpected high intake manifold air flow condition exists that
can lead to increased engine speed and puts the NGC into a High Air flow Protection
limiting mode. The High Air flow Protection feature includes RPM limits for when a
Throttle and or MAP sensor limp-in fault is present.
When Monitored
During all drive modes.
Set Condition
If vacuum drops below 1.5Hg with engine RPM greater than 2000 RPM and closed
throttle. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
-VACUUM LEAK
-RESISTANCE IN THE (FS56) 5-VOLT SUPPLY CIRCUIT
-(FS56) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (Kl) MAP SIGNAL CIRCUIT
-(Kl) MAP SIGNAL CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (FS55) 5-VOLT SUPPLY CIRCUIT
-(FS55) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT
-(K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
-MAP SENSOR
-THROTTLE POSITION SENSOR
-PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
25312083-mkm0xbqveb5zta3uncrswycs-5-0.png Auto Repair Help US 25312083-mkm0xbqveb5zta3uncrswycs-5-2.jpg

Dec 07, 2014 | Dodge Cars & Trucks

1 Answer

Wht is a TXV


Simply it's a valve in a refrigeration system that controls or meters how much coolant is allowed into the evaporator.
A thermal expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in refrigeration and air conditioning systems that controls the amount of refrigerant flow into the evaporator thereby controlling the superheating at the outlet of the evaporator. Thermal expansion valves are often referred to generically as "metering devices".
A thermal expansion valve is a key element to a heat pump; the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements, a compressor, a condenser, a metering device and an evaporator. As a refrigerant passes through a circuit containing these four elements, air conditioning occurs. The cycle starts when refrigerant enters the compressor in a low pressure, low temperature, gaseous form. The refrigerant is compressed by the compressor to a high pressure-and-temperature gaseous state. The high pressure-and-temperature gas then enters the condenser. The condenser precipitates the high pressure-and-temperature gas to a high pressure liquid by transferring heat to a lower temperature medium, usually ambient air. The high pressure liquid then enters the expansion valve where the TX valve allows a portion of the refrigerant to enter the evaporator. In order for the higher temperature fluid to cool, the flow must be limited into the evaporator to keep the pressure low and allow expansion back into the gas phase. The TXV has sensing bulbs connected to the suction line of the refrigerant piping. The sensing bulbs give temperature readings to the TXV to adjust flow of refrigerant.[2]
http://en.wikipedia.org/wiki/Thermal_expansion_valve

Jun 18, 2014 | 2006 Saturn Vue

1 Answer

Astro troubleshooting over fueling ?


The pressure regulator is a diaphragm-operated relief valve with system operating pressure on one side and and atmospheric pressure on the other side. The function of the regulator is to maintain a constant pressure to the injectors at all times, by controlling the flow in the return line by means of a calibrated bypass. The pressure regulator on this unit is serviced as part of the fuel meter cover and should not be disassembled. The regulator is in your IAC valve. (Idol Air Control Valve) It is most likely stuck. Replace and watch the magic happen. Hope this helps.

May 20, 2014 | 1991 Chevrolet Astro Extended

2 Answers

2003 ctdi goes into limp mode


code p0238 refers to manifold absolute pressure (MAP) sensor A TC system --high input===causes --wiring short to positive --MAP sensor---ECM
Replace the sensor (internal fault)
code p0102 refers to mass air flow (MAF) sensor /volume air flow (MAV) sensor --low input ===causes wiring short to ground ---MAF/VAF sensor
again the MAF is implicated as faulty

code po113 refers to intake air temperature (IAT) sensor--circuit malfunction===causes --wiring open circuit/short to positive --wiring short to ground --ground wire defective---IAT sensor---ECM

Now looking at all the codes the most common fault is wiring damaged so pay particular to the condition of the wiring loom --the condition of the connections --clean pins - pins not bent --water in the connections . IT is common that when disconnecting the units that the connection is pulled apart by pulling on the wires .. This check is the cheapest before any money is spent on the rest . Do not clean but replace because if cleaning does not produce a result you still do not know if you cleaned it properly or if it is faulty

Mar 08, 2014 | Honda Cars & Trucks

1 Answer

THE A/C PRESSURES LOW SIDE IS 75lbs HIGH SIDE IS 200 AT IDLE HIGH SIDE GOES TO 400 AT HIGHER RPMS BUT A/C NEVER COOLS RITE


High side should never go over 300...Two things that you should fix first....
Check and make sure nothing is blocking the air flow though the condenser no or low air flow will cause high pressure...
Next, (Orifice Tube) you will have to remove all freon to get to it...It may be clogged, and will cause high pressure...
There are more things, but i think, these may correct the problem...Good Luck

Aug 09, 2011 | Hummer H2 Cars & Trucks

1 Answer

I have a 99 chevy suburban that won't cool past 60 degrees and when idling is at 70 degrees. I have replaced the a/c compressor, orfice tube,the accumilator,rear expension valve, and fan clutch. My low...


These numbers are a little high depsite the high ambient conditions.Amazingly enough ,automotive low side suction pressure will equal the degrees its putting out at the evaporator coil...for instance,70 psi low side pressure will produce about 70 degrees of cooling. At 300 psi on the high side(which is high) this is about as low as the suction pressure will go....you need it to go lower.I would probably be concerned with the freon level as a slight overcharge could boost these numbers.Poor air flow through the condenser can also create a higher head pressure than desired.If possible,I would evacuate and re-charge the system with the correct amount of 134a refrigerant. Try to get those pressures lower...about 250/50 would be a decent pressure value in this ambient condition.Verify good airflow through the coils and pay close attention to any foreign debris like plastic grocery bags or wrappers covering the coils...Ive even seen these make their way between the small gap between the condenser and radiator so use a light and inspect carefully for this.Air flow through that condenser coil is vital and any deficit there will create high head pressure which obviously causes high suction pressures....good luck

Jul 29, 2009 | 1999 Chevrolet Suburban

1 Answer

2001 honda civic Air conditioner will not blow cold. I went to recharge it the other day and when i put the gauge on the low side the pressure was extremely high 80psi+. Why? Is this something i can fix??


Air conditioning systems are always high-pressure systems,simply because the refrigerant used is a gas forced to become liquid.

In fact, a loss in pressure in the cooling lines means that your system will have no cooling capacity.

Your problem description points towards your compressor not engaging. There could be a switch in your car's interior/dashboard that indicates 'COOL' or A/C (or something like it) that should manually engage/disengage your a/c compressor.

In case this still does not work, your compressor clutch or the electrical system engaging this is faulty and will need the attention of a qualified service technician.

Hope this helps.

Jul 01, 2009 | 2001 Honda Civic

1 Answer

Poor air flow from floor vents or when multiple vents choosen


There has to be something blocking the output somewhere. Check where vents come out to see if something has fallen down to block them.

Dec 05, 2008 | 2006 Honda Accord

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