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Gauge manifold readout interpretation

Trying to diagnose a central air conditioning system using a freon gauge manifold. How can I tell what the gauge is showing me? Gauge readout analysis

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First of what is the problem taht you are having? To properly diagnose a air conditionign system yoiu have to look at more then just the refrigerant pressures. There is airflow and also duct design and a whole list of other variables. If you haven't done it then my suggestion is to checkout the local colleges in your are and see if they have ight classes to attend to learn more. I had to go to school for 2 years to get my degree and am still learning every day that I am working. thats been 20 years now. Good luck.

Posted on Jan 06, 2009

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Engine check light on


Map sensor: Manifold Absolute Pressure sensor- it's a measure of manifold vacuum that is sent to engine computer; so it can figure out engine running conditions and how much gas to add for the correct air-fuel mixture.
You probably need a new sensor. I don't know what newmatic means? But, pneumatic is of or pertaining to air, so hey, you better diagnose this before buying a new map sensor- just check if your vacuum hoses are not deteriorated from age, check if you still have a good vacuum signal from the intake manifold. If you were to hook up a vacuum gauge to a intake manifold tap-like the one going to your map sensor-with the engine at normal idle, the gauge should show a nice steady needle somewhere between 16 and 22 inches on the dial face. It's a measure of inches of mercury if you understand science-most people don't so the dial face is very large and you just understand it as inches of vacuum-how much lower the air pressure is inside the intake, versus outside air pressure. All engines create manifold vacuum, and the best, newer engines have a very steady vacuum at idle of 21, or 22 inches on the gauge. That's what you look for, 16 and steady is okay, a good map sensor would be sending a good signal to the computer by a varied voltage signal: manifold pressure is known good, so to speak.

Now manifold pressure varies under different running conditions. But by looking at a vacuum gauge, you are confirming that your manifold vacuum is good, you have no vacuum leaks, no air or vacuum leaks anywhere that will upset the apple cart, and cause the computer to question the info from the map sensor.
If your vacuum reading is way below 16 inches, like 10 inches, or 12, or 14 and holding steady, well, don't you see, you have a major vacuum or air leak somewhere. Vacuum hoses, pcv hose, intake manifold gasket...somewhere, your engine is sucking in extra air, and it's causing havoc with the engine management controls. It's where a lot of poor running conditions occur. So, try a used or new map sensor, or buy a vacuum gauge for $20. It saves a lot of time looking for vacuum leaks, and it's also very good at detecting valve problems and other internal engine conditions. You just have to learn how to use it, and understand what it is telling you.
I think Dodge put the map sensor maybe on the firewall on the passenger side, not sure, it's been a lot of years ago.

Nov 19, 2013 | 1988 Dodge 600

2 Answers

What's your problem?ac compresor seems like dont recive energy


There are 2 safety switches in most A/C systems. A high and low pressure sensor will cut off the Compressor clutch. You can borrow a gauge set, called Manifold gauges, from tool loaner programs at Autozone, Advance, or Oreilys autoparts.

There are several ways to try to fix this. It depends on what the pressure gauges show.

If the pressure is low, but not empty, there is hope. The old Freon leaked out. It will happen again. But there are products which can plug some leaks. Then add Freon using the gauges. The ideal amount is an amount that makes the compressor stay on the longest. There are gauges that can tell you, color coded, and reasonable priced.

If the system is completely empty, it is contaminated with outside air. The Freon will not function correctly if added and a new Dryer(A/C part) should be installed. There is a Vacuum pump which must be attached to draw down the system to a negative vacuum. So even changing a part will not decontaminate the system without the pump. Pump can be loaned from Autozone with big deposit which is returned, no hassle. Some parts require special pliers and "O" rings to reinstall.

The price of Freon has skyrocketed. What once costed $12 to refill a car now costs $50. So going to a repair shop can be a better idea if you waste Freon doing it yourself. If you don't repair the leak, imagine $50 evaporating into the wind with the Freon.

Apr 14, 2012 | 1994 Buick LeSabre

3 Answers

How to add freon in a centralized air conditioning unit


The compressor needs to be running.Also you need freon charging guages and a pressure temp chart to tell how much you need to add.
If your not sure of anything i said here have a service person do this.You take a risk of damaging the unit and yourself.

Nov 21, 2011 | Whirlwind FH-778 Air Conditioner

2 Answers

Add freon to 2003 audi A8...any special tools needed? I have gauge and equipment but system will not take freon on the high side.


NEVER attempt to add freon on the HIGH side...This is very dangerous and can result in injury and damge to the system! The correct set of AC manifold gauges are needed to monitor pressures and determine the overall condition of the system...Refrigerants should be added by trained refrigeration technicians.

Jul 16, 2011 | 2003 Audi A8

1 Answer

Diagram on how to install freon for air conditioning


freon is added though the suction side service port. if you don't have a manifold gauge set to check system pressures first then you might be doing more harm than good. if you took the system apart for any component change, then you will need to replace the drier/reciever and evacuate the system using a vacum pump before adding freon.

May 24, 2011 | 2002 Mercury Sable

1 Answer

When you change from heat to air , it still blowes hot air like it is not switching to air conditing, the compressure is running and lines get cold, but no cold air. thanks


If the orifice filter is clogged, this will happen, a better check can

be done with an ac manifold gauge set, the low side reads the

evaporator pressure and the high side reads the discharge

pressure. I had the same problem while checking the ac on a

2000 gmc 1500 z71 4x4. other things that could cause this are

to much oil in the ac compressor or not enough freon in the

system. an overcharged system , the best way to check it is with

a gauge that way you can tell if you have the right amount of freon

and oil in the system. plus the gauge set will let you know the

extent of your problem. good luck!

Apr 06, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

How do i hook my manifold gauges to my residental condensing unit to check pressures


The AC manifold gauges set have the three chambers: the low pressure chamber (left side), utility chamber (middle), and the high pressure chamber (right side).

When technicians connect the HVAC manifold gauge to the air conditioner units, he connects the low pressure side of air conditioner unit to low pressure gauge side.

If he wants to read the pressure in discharge line he connects the high pressure gauge hose to the air conditioner high pressure side.

The utility port (the middle chamber) is a place you connect the hose to vacuum pump, recovery units or add or remove refrigerant from AC units.

Air conditioning gauges is used to measure air conditioner units pressure within closed-system to evaluate or troubleshoot the AC units. Gauges manifold set is the most frequently used item when it comes to refrigerant or pressure.

Air conditioning gauge set allows the HVAC technician to check AC units operating pressures, transfer AC refrigerant, pressure test system, purge the system with nitrogen, and perform other necessary tasks.

The gauges manifold set includes the hoses, the manifold, the valves, the compound gauge (low pressure gauges) and high pressure gauge.

Jul 24, 2010 | Heating & Cooling

3 Answers

AC trouble


You are low on freon, it needs to be topped up.

Jul 18, 2009 | 1998 GMC Jimmy

2 Answers

Where do i put freon in on a 2005 focus


Your focus should not take freon. Freon is used in older cars from 1995 on back. Your focus should take R134 and the plug for your AC should be located under the passenger side wheel well (yes ford makes things so convenient). Just unscrew the little plastic crews in you wheel well and attach the gauge and can of R134 (should take a little more than 2 large cans).

Jun 29, 2009 | 2005 Ford Focus

1 Answer

The air conditioning in my 2008 Buick LaCrosse does not work.


Need clarification...
Does the compressor run steady, cycle on and off continually or even come on at all? If cycles on-off then attach charge manifold/gauge set and bring freon up to proper level. If does not come on at all, then start engine, turn a/c on, remove two-wire plug from low pressure cut-out switch mounted on accumulator. Jumper the wires at plug and see if compressor comes on. If so, bring freon up to proper level.

If charge level was low then check for system leak after system charge with an electronic leak detector if available.

If compressor runs but doesn't cool vehicle then with engine running and a/c on feel (carefully) the lines. High side line should be hot (be careful) and low side line should be cold. If these are both true then it's possible non-cooling condition is due to air temp diverter door not operating or heater valve not shutting off (if so equipped). If low side not cold it could be a plugged orifice tube. If high side not hot it could be bad rings on compressor. Both conditions can be diagnosed with a/c manifold gauge set by noting the pressures.

For safety... if not familiar with differences between hi and low side components or with charge equipment then please take vehicle to qualified person for service.

Jun 22, 2009 | 2001 GMC Yukon

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