Question about 1999 Honda Civic

1 Answer

1999 honda Civic Ex 5sp. I'd like to know how many PSI of freon should i put in the ac lines. I replaced my ac compressor and I have the freon gage (the one that has the blue and red gages). I know how to plug the 2 hoses into the 2 lines. but I'm not sure how much PSI of freon to add. thanks

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 6,784 Answers

HI. A good pressure will be near 80 lbs on the blue side and, roughly, 140 Ibs on the red side. Be sure to hook up the A/C gauges to the system with the red line going to the high side (the small line) and the blue line going to the opposite, large-diameter, low-pressure side.

NOTE_ the stated pressure rates should be present with the engine off.

Posted on Jul 09, 2010

  • 3 more comments 
  • Michael Masters
    Michael Masters Jul 09, 2010

    • NOTE_Total pressure should be around 400 psi when the compressor is running and clutch engaged.

  • Michael Masters
    Michael Masters Jul 09, 2010

    NOTE_ Only 18oz should be inserted into the system. No more no less.

  • Michael Masters
    Michael Masters Jul 10, 2010

    NOTE_ The temperatures may fluctuate your reading, so for example:

    At 1500 rpm on an approximately *80F day in the shade:

    Low side should be between 22-36 psi
    High side should be between 220-295 psi

  • SERGIO S ROSA, JR Jul 10, 2010

    how do I know how much freon I put in?

    Is there a special tool to measure?


  • Michael Masters
    Michael Masters Jul 10, 2010

    Actually; this is not for the novice. A very expensive reclaimer must be used to adjust the Freon level, during recharging.. An ASE technician certification and a MACs card is needed to own one, so you must go to a shop for further diagnosis. You could injure yourself at this point.

    With that said, you will need to evacuate the system at you local oil change garage before recharging. You should only use up to 18oz of your recharge reservoir. look on the can to see how much is actually stored in the recharge refrigerant can you purchased.


    1.The proper procedure will be to start the engine and set the air conditioner to its maximum setting. Open the valve and allow the coolant to be sucked into the system. This usually takes about ten minutes. Don't shake or turn the can, simply allow it to empty while upright. Once the coolant in the can has been dispensed, pull the nozzle from the low pressure port by pulling up on its outer ring while simultaneously pulling the nozzle. Turn the can of coolant counterclockwise and dispose of it.

    2.Repeat Step 1 by using a can of compressor lubricant. This lubricant can already be added to the coolant, but typically they are separate. Allow the can to empty, then remove it as before. Continue this process with more coolant until the system does not take in any more. Civic air conditioning systems use about one and a half to two cans of coolant and a can of lubricant.



1 Suggested Answer

  • 2 Answers

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

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Ac recharge

Connect freon cylinder with compressor suction side And slowly refill refrigerant.

Aug 07, 2016 | 2007 Honda Civic 1.8

1 Answer

Now that I've located the pressure switch for the air conditioner compressor on a 1999 Honda Odyssey I would like to know what wires would I jump to each other so that I can put freon in it

Kelly,Trouble shooting forum links below, the 3rd video show which contacts to cross to get AC clutch to engage.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Honda Odyssey not working
Compressor Clutch won engage Honda Tech
Troubleshooting AC unit Honda Odyssey 2003

May 02, 2016 | Honda Cars & Trucks

1 Answer

Solution to a non-engaging AC clutch?

What you need to do is check the air gap in the clutch, if it is to large it will not engage, it can also be adjusted by removing shim washers or removing some thickness off a Washer....

Feb 13, 2016 | 1997 Honda Civic

1 Answer

I have a 2008 Honda Civic which blows cold hair at first and then starts blowing warm air.

It sounds like you are just tossing parts on it, not diagnosing it first. Sometimes it is cheaper to pay a professional. Does the compressor stay running when it isn't cold? If so, is the return pipe, (the large 1) cold? When you replaced the freon, was it evacuated proprely, with a vacuum pump, for at least 20 minutes at -28 psi vacuum? If the compressor turns off when it gets warm, is power still going to the compressor? If it is, the magnetic coil is failing and/or the clutch gap has become excessive, not unusual on higher mileage Hondas. Your question about the fuse baffles me, why even ask, just replace it with a spare fuse.

Jul 01, 2015 | 2008 Honda Civic

1 Answer

Recharged ac now switches on and off

could be that system is still low ....try coolant gage to check level in system... keep me posted and good luck ......please rate my post if info is a help....

Aug 22, 2012 | 1999 Honda Civic

1 Answer

I have a 1999 honda civic ex. I replaced the

I sure would. Some of those engines can destroy themselves when the timing belt breaks.

Apr 20, 2010 | 1999 Honda Civic

2 Answers

2002 Honda Civic A/C not working

high and low pressure swich try putting freon in it

Aug 12, 2009 | 2002 Honda Civic

1 Answer

Ac not throwing sufficient cold air

I would try recharging the system. if the recharge doesn't produce could air, this will confirm a compressor failure.Inspect the clutch function. the AC clutch should click when it is engaging the compressors actions.

May 28, 2009 | 1999 Honda Civic

1 Answer

Ac does not work

it sounds like the main control that's in the dash where you control your hot and cold the a/c may be dieing out on you. You may need to replace that unit.

May 21, 2009 | 1994 Honda Civic

Not finding what you are looking for?
1999 Honda Civic Logo

Related Topics:

310 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts


Level 3 Expert

76109 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides