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Which line high pressure A/C line and which is the low pressure on a car?

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The low pressure line should be the larger of the two lines. If you have 134A and are trying to refill it the connector will only fit the Low Pressure side as they are different sizes. Today's refill kits come with the connector and it only fits one side.

Posted on Jul 10, 2010


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 1991 high pressure line

low pressure is coming from the dryer, the canister on the passenger side of fire wall. The high side is next to compressor.

Posted on Jul 05, 2009

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SOURCE: A/c doesnt cool the car. High pressure line is hot

the valve on the evaproator ,or in laymans the restrictor valve thats bolted to teh rad thats inside the car

Posted on Aug 01, 2010

  • 112 Answers

SOURCE: Power steering, stiff wheel. Installed

yes that could be it are it could be the sensor for the assit it is a vacuum and controls how much fluid gets though the line

Posted on Feb 10, 2011

SOURCE: where do you put the

The high port is in plain site next to the radiator on left side
The low port is on the compressor,have to remove some
rubber parts to get over sub frame.

No point in adding
If you have to add you have a leak.

How would you know how much is in the system &
how much to add. Don't do it

Have it properly done at a repair shop

Posted on May 23, 2011

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1 Answer

How do you identify the high pressure and the low pressure pipe in a car air con

The line that goes from the compressor towards the passenger compartment is the high pressure, the line that goes from the compressor towards the front of the car is the low pressure.

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there are two pressure sensors in an ac system . One is to measure high pressure and one is to measure low pressure. The high pressure will be on the high pressure line to the condenser and the other will be on the low pressure line . They can be either at the receiver /dryer on the steel lines next to the compressor

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Just want to make sure that the a/c low pressure line is located high is the a/c low pressure located in the back of engine compartment and high for easy access

Typically the the low pressure/suction line is a bigger pipe/tube, as far as location it depends on the car. The bigger AC line is almost 99 percent of the low pressure. Usually on the cap it will say most of the times to there is a different hydraulic fitting for the low and high side. Most cars I have seen have a little tag that will say suction or low pressure line, and or discharge high pressure.

If you are re charging the gas, always use the low pressure side of the system.

I’m happy to assist further over the phone at

Aug 23, 2013 | 1988 Cadillac Seville

1 Answer

Would like to know if the 2 lines are both high pressure lines or is 1 high pressure and 1 low pressure this is on a 1993 chevy luminia car

  • 1 low side and 1 high side.
  • Here is a diagram of a standard car refrigerant operating system.

  • Hope this helps and thank you for using FixYa.
Regards, Tony

Aug 09, 2011 | 1993 Chevrolet Lumina

1 Answer

I have a 1995 jeep grand cherokee and i cant figure out the difference between the high and low side is the low side gonna be on a metal pipe near the fire wall or on the compresure its self cause that is...

during the 1995 R12 was still in uses if you have 134a then you have the conversion here are the valve rule of thumb if the A/C pipes are thick you have the low pressure line the filter drier is a low pressure area, here the high pressure the condensor the thin line is the high pressure, go to the filter drier follow the thick line and you will find a valve that low pressure, go to the condensor the thin line you may even find a sight glass that area is the high pressure you should find a valve this is the high pressure

Jun 04, 2011 | 1995 Jeep Grand Cherokee

1 Answer

1991 high pressure line

low pressure is coming from the dryer, the canister on the passenger side of fire wall. The high side is next to compressor.

Jul 05, 2009 | 1996 Lexus LS 400

1 Answer

I cannot differentiate between the low pressure and high pressure

This is a little A/C 101. Follow the A/C lines. All A/C systems have a high pressure side and a low pressure side. The high pressure side is from the compressor to the condenser coil on the front of the vehicle to the evaporator coil in the dash. At the expansion valve in the evaporator the pressure drops. At the expansion valve the refrigerant changes from a liquid to a gas. This provides the cooling. The low pressure side is from the evaporator back to the compressor. Usually the high pressure lines are smaller than the low pressure (suction) lines.

Jun 13, 2009 | 2003 Chevrolet Silverado 1500

4 Answers

Where do I recharge ac at

there are 2 ports one for low pressure and one for high pressure. the low pressure is bigger in diameter and is usually close to the dryer and or fender and firewall. the high pressure is near the condensor on the fron of the vehicle. if there are caps for the ports low will be blue and high will be red. low side pressure should be 35-50 psi and high pressure should be 135-150 psi

May 11, 2009 | 1998 Dodge Dakota

2 Answers

Looking for low pressure port for servicing Freon in A/C system for 1998 Chevrolet Suburban. There are 2 ports on top of compressor. Which is the low side and which is the high side?

The ports on my 2005 silverado are on the same line,which is very confusing but, in between the two ports is the metering device (orifice) which changes the high pressure gas into a low pressure gas.The two ports are of a different size,with the low pressure being the smaller of the two. You can put your hand on the line, on each side of the metering device connection and the high side will be hot and the low side will be cold

Apr 19, 2009 | Chevrolet Suburban 1500 Cars & Trucks

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