Question about 1991 Buick Regal

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A/C service ports

Hi, can anyone tell me where the Low Side A/C service port is on a 1991 buick regal 3.8 is? I found the high side service port,but I can't find the other one. Any help is muchly appreciated, Thanks

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Its under the air filter you have to remove the whole air filter set up

Posted on Aug 24, 2008

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Low side is on dryer;not in line

Posted on Aug 02, 2008

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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

How do i charge the airconditioner


On a Traverse the low side service port can be found on the return tube between the radiator and the engine down by the compressor. It is almost directly below the high side port ( about 2' below it).

Sep 01, 2012 | 2010 Chevrolet Traverse

1 Answer

Picture of low side ac port on 2001 buick regal


You low pressure port is against the firewall just below the center of the cowl and is best accessed from the drivers side

Jun 30, 2012 | 2001 Buick Regal

1 Answer

Where is the low ac suction side located on a 1992 buick regal


First find the A/C compressor, it is attached directly to the engine and has a pulley on it. When you turn on/off the A/C while the engine is running you should be able to locate it by listening for it to engage.

When you find it you need to trace the two metal pipes that come out of it. One pipe is the high pressure side and one is the low. You will know which one is the low side when you find the 'tee' with a plastic cap (both high and low have one).

The fitting that comes with the A/C recharge kit will only fit properly on the low pressure port. Sometimes, but not always the low pressure port has a blue cap.

Jun 19, 2011 | 1992 Buick Regal

1 Answer

I have a 1991 Buick Skylark for which I just bought an R134a AC conversion kit. However, the adapter in the kit that is labeled as the low side adapter does not fit on the port labeled as the low side...


it is possible just to make sure go to a auto zone or advance auto have the counter person come out and check he may assist you installing the Freon but always better safe than sorry good luck

Apr 23, 2011 | 1991 Buick Skylark

2 Answers

I need to know how to find the low port to add refrigerant to the AC on my 1998 Buick regal.


Follow the AC lines and look for a plastic cap. There are 2, The big one is the high side and the smaller one is the low side. Unscrew cap to add freon.

Aug 20, 2010 | 1998 Buick Regal

2 Answers

Where do i add r134 on the 99 buick regal , I see to nozzles under the hood one to the right boy wheel shock and the other back center closr to firewall


Closer to firewall is where your low side port should be. Your R134 filling hose quick connect adapter will ONLY fit on the proper "low side" connector port at that location because it is a different size than the high pressure port. You can't put it on the wrong port and get it to fit.

Jul 25, 2010 | 1999 Buick Regal

1 Answer

Garging the ac unit


the low side on this year is on the larger lines of the two sizes,it will be the 1/4 in service port,the larger of the two ports the small service port is on the small line ,it is the high side ,,but that is for r12 system which it came out with,if it has been retofitted to 134a freon use it will have a different kind of service port the large line will have the smaller of the two ports it is the low side ,looks like a quick connect,,,,if it hasnt been changed over ,go to parts store and ask for service port retrofit for 134s low side ,if u do not have gauges dont get the high side service port,,,if so ask for 3/16 size high side retofit .

Jul 03, 2009 | 1991 Ford F250

1 Answer

Where are the low side and high side freon ports on a 92 buick regal with a 3.1 engine


high side is higher than low ,two different connections, screw off caps follow from compressor ,hope to help you,robert b.

Jun 20, 2009 | 1995 Chevrolet K1500

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