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Where is the low pressure service valve on the ac unit?

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  • Dodge Master
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Good rule of thumb, high side is smaller hose, low side is bigger.

Posted on Jun 16, 2009

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1 Answer

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

2 Answers

Ac problems


Either connection is bad to low pressure sensor or pressure sensor is faulty.

Jun 22, 2014 | 1997 Cadillac DeVille

1 Answer

Ac drainline 2002 toyota camry


Hi Andreas, The valves for evacuation and refilling the ac are the same. To drain the system an evacuation pump should be connected to the low pressure and high pressure valves. The valves are situated in the engine compartment, the high pressure has a red valve cover and the low pressure black. You will easily find the valves by looking along the air conditioning plumbing. Regards John

Sep 16, 2012 | 2002 Toyota Camry

1 Answer

Hi I bought a used volve about 6 months ago. Lately when I use the ac the far left vent blows out warm air and it also is not blowing out as cold of air as it used to. I was going to add some more freon...


> I was going to add some more freon and the gauge that came with the can does not fit the valve. There are normally two valves on the AC lines; one is the low-pressure valve (inlet to the compressor), the other is a high pressure line leaving the compressor and going into the exchanger. The low pressure valve is the point at which Freon is added and pressure is measured with a single valve. The high pressure valve is customarily used only by service personal to determine compressor performance and should never be used to recharge the system; they are intentionally different to avoid rupturing the the Freon container. Trace all of the lines to be sure if you have found the right one to use for recharging and measuring the 'low' pressure side.

Aug 24, 2010 | Volvo V70 Cars & Trucks

1 Answer

How do you connect a/c charger to make your central air cooler


The 1998 Dodge Caravan ac should be charged at the low pressure service port. This port is located on the suction line near the compressor. The suction line can be identified by it's size, it being the larger of the two line connected to the compressor. You must purchase a recharge kit at your local part store, which should include charging hose with pressure gauge and a can of R134a freon. Gloves and eye protection should be worn during servicing.(freon can freeze your eyes and cause frost bite to your hands). Connect freon to charging hose, connect charging hose to low pressure service port, open valves and start engine, turn on ac. If compressor won't start it may be required to disconnect the low pressure switch and jump out the connector.

Jul 16, 2010 | 1998 Dodge Caravan

1 Answer

Where is the low pressure AC port. I am trying to find it so that I can charge the AC system.


the receiver / dryer on your car is located in the right front bumper. you have to look up from underneath. you will see an aluminum cylinder (the drier). the valve is on the very top of this unit, not very visible, you have to reach up and feel it. it is not very conveniently located, but that is where it is. also note that there is probably a plastic cap on the valve that will need to be removed before servicing. good luck!

Jun 14, 2010 | 2003 Ford Focus

2 Answers

2002 ford expedition air conditioner needs R 134 refrigerant. I cant seem to locate the service port.


The low pressure valve on the 02 expedition is located on the accumulator on the passenger side fire wall. The accumulator is underneath the battery relay and a grouping of wires. Had to squeeze hand underneath a heater2_bing.gif hose and an a/c line to remove cap and hook up hose. Nothing has to be removed to locate the valve just a little touchy feely. Valve faces a 45 forward toward the engine.

Jul 06, 2009 | 2002 Ford Expedition

1 Answer

Need to service ac


THE VALVE U WANT IS IN THE LOW SIDE OF THE AC SYSTEM, THE LOW SIDE IS THE LARGER OF THE 2 LINES FROM THE AC COMPRESSOR, IT WILL BE NEAR THE REAR OF THE ENGINE COMPARTMENT.

May 26, 2009 | 2001 Chevrolet Malibu

1 Answer

2000 ford taurus low end ac valve


please rate as fixed if this helps you.

The low pressure service gauge port valve is located on the evaporator to accumulator/drier suction line.


The evaporator to accumulator/drier suction line contains low pressure refrigerant gas and is equipped with a serviceable low pressure A/C charge valve port.

Apr 28, 2009 | 2000 Ford Taurus

1 Answer

1999 FORD TAURUS EVAP SERVICE PORT


The AC charge port is the on low pressure AC line (large line from compressor) near the firewall. Take care not to overcharge, there are other causes of no cooling like a stuck AC compressor cycling switch or a air temp control blend door motor malfunction, what is the issue u have? does the AC compressor run?

Mar 11, 2009 | 1997 Ford Taurus

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