Question about Atd Tools R134a Economy Brass Manifold Gauge Set - ATD-3687

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How to readR134A ac manifold gauges





A/C R134A Manifold gauges

How do you read R134A a/c manifold gauges

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The blue gauge is the low side. It should read between 30 to 60 PSI depending on temprature. The red is the high side, and should read roughly 3 times the outside temp. Good Luck

Posted on Jun 22, 2009

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How and where to add freon to a1995 sedan deville


Verify ambient temperature is above 65 degrees F.

1. Safety> - safety glasses, long sleeves and gloves, (exposure to refrigerant can cause frostbite).

2. Attach hoses to manifold> assembly, (hi, lo, and fill).

3. Remove caps from service ports, (Low press. Larger tube from evaporator to accumulator - passenger side over fender well; High Pressure - smaller tube from evaporator along firewall towards driver's side). Verify service> ports are clean.

4. Attach low press. and high press hoses to proper service ports.

5. Start car>, reset low refrig code, and turn ac on high and fan on high.

6. Read gauges and compare with chart provided with gauge set.

7. If low and high press readings are both low, then system needs recharge.

8. To recharge, attach fill hose to can of R134a and slowly open low press valve>, (NOT HIGH PRESS VALVE), until low press side reads 40 psi.

9. When flow stops and pressures stabilize close valves> and disconnect manifold from service ports and refrigerant can. Replace service port caps.

Aug 19, 2015 | 1995 Cadillac DeVille

1 Answer

I have a 2003 envoy and my air conditioner blows cold air on one side of panels and on other side it blows hot air?


your A/C may need freon....More likely R134a is the gas that will be working with your system.You will need a manifold gauge to check it ... A car will need 'topping up' once every 6 to 9 months if its used often .If its not used often possibly once every 3 to 5 months. The blue gauge should read from 35 to 40 PSI while the red gauge (high pressure) should be 200 to 225 PSI.

Mar 04, 2014 | Cars & Trucks

1 Answer

How much freon needed


It doesn't take freon, it takes R134A. There should be a sticker in the engine compartment that tells the amount. but when filling low side should be somewhere between 25-45 and high side 150-300. if you are serious about charging your own system please purchase a set of manifold gauges. it is the only way to properly charge the system. Harbor freight tools has a set for $45 and big lots sells refrigerant for $6. using the pregauged cans to fill your system is a hack way to do it and can be harmful to your ac system. Properly charging the system has a direct relationship to the outside ambient temperature and you can find a R134A reference chart on google images with a simple search. Good luck and also there are some pretty good videos on youtube about using manifold gauges and recharging refrigerant.

Jun 28, 2013 | 2005 Hyundai Santa Fe

1 Answer

How o you add r134a


by using manifold gauge. and must read on it, 38psi for the low side and 180psi for the high side.

Aug 20, 2012 | Cars & Trucks

2 Answers

When i turn on the a/c,the compressor does not work


CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.

Aug 11, 2011 | 1997 Nissan Pathfinder

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Ok i jus buy a ac chek presure manifold, i wanna recharge mi ac carcompresor but the manual donat said how conect tha house in the r134a can, just said how to chek the presur,, can some one help me with...


To connect the hose to the can, it should have a locking ring with a valve. Some connectors screw on clockwise, and others snap on and clamp downward with a locking lever. To open the can, just turn the T valve down clockwise. To release the freon into the hose, turn the valve to the left. Never remove can from the valve assembly, until the can is empty. If you have no clamp and valve for the freon, just a hose, you can buy one at your local auto parts store

Jul 30, 2011 | Mountain R134A Brass Manifold Gauge Set...

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Is there a universal gauge set for all types refrigerant


The most common manifold are only for r-12 and R134A. Because of the pressure differences between that and R22 and R-410A ( and the manufactors make more money by keeping the types of manifolds seperate). I haven't seen a universal manifold that would cover all types freon.

Feb 05, 2011 | Robinair R-134a Manifold Gauge Set A/c...

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

2 Answers

On my 2003 Chevy Silverado, the A/C compressor won't kick on. Just blows out warm/hot air.


The ac system may need freon added,if the system is low,or out of freon,it will not allow the ac compressor to come on.

Apr 11, 2010 | 2003 Chevrolet Silverado 2500HD

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