Question about 2003 Buick Century

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I need to know where the low-pressure valve is to refill the a/c system with freon.

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  • 290 Answers

It maybe on the accumulator/dryer itself (look like an oversized aluminum can, usually mounted near the firewall)

Posted on Jun 22, 2009

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Ac clutch engage disengage


You are probably low on Freon. Your symptoms are the way the A/C goes out after running out. A bigger problem is losing the lubricating oil in the A/C system as the compressor can seize if the safety pressure switches fail.

There are several fixes and approaches to each problem. You need to determine if Freon still exists in the unit. You can get by with adding Freon with an additive to fix leaks and lubricate the compressor. To add Freon you need to access the Low pressure port and jump the Low pressure safety switch for the initial can of Freon.

There are tool loaner programs at the big Autoparts stores which can allow for this process.

These same stores may have electric Vacuum pumps to purge your empty system for refill. If you do not have enough pressure left in your system, outside air can enter. If you are lucky and timely, a refill with Sealant Freon mix after purging the system can restore it.

Every car is a different case. As your car is 10 years old, it may have been leaking slowly for years, or in the last week. You never know until you try finding the leak. Some people just spring forward and trust the Sealant to work. Others use devices known as sniffers or leak detectors before trying to refill the system. Some leaks can be so small or in places with no visual access.

The cheapest way is to use the Sealant Freon after testing the pressure. Use gauges to determine system pressure.

Please comment on my info.

Mar 18, 2013 | 2003 Mercury Grand Marquis

2 Answers

When i turn on ac it blows hot air


Normally due to low freon. Also, notice if the a/c compressor clutch engages, as it will not if the freon is low.

Jun 05, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

How can i recharge the air conditioner? Where is the hose located?


Ok if you want to do a home repair in hopes of saving yourself a lot of money and with hopes your system is not in major trouble, here goes:
First step buy 3 types of 1 lb. cans of refrigerant R134a at a parts store, 1 can of leak detector freon combination, and if possible 1 can freon/air conditioning oil combination freon along with 1 can of straight r134a freon.
The store will sell you a charge hose with a cheap type of charge gauge attachment and fittings to attach to your system for the re-charge.
Providing your system is low on freon,First, with the vehicle running and the a/c on full cold, high fan, install the 1 lb. can of freon/oil combo first only charging through the low pressure side of the system never through the thin line high pressure side as the pressure from the high side can enter the cgharging freon can and explode it like a bomb,(this low side line is the larger hose and the low side charging hose fitting the parts store sells you will only screw onto the low side charge valve which is normally marked "low" on the top of the plastic dust cap that is factory installed(hand screwed) on the low side valve fitting.
Secondly after the oil/combo can is emptied into the low side and you of course are wearing mechanics hand protection gloves and eye protection googles, then and only then will you install the leak dector 1 lb. freon can combo.
Third you will install the last 1 lb can of r134a freon, however your vehicle will not allow the whole last pound of freon into its system by means of a pressure relief blow valve that will automatically blow off any excess pressure once the system over fills, the system typically holds approximately 2.75 lbs. of freon.
If you have successfully installed the above freon into the system it should be up and running providing the system is in fairly good working order, by that I mean it may have a very slow leak that allowed the freon tio originally escape in the first place causing you to refill it, and if it does have a leak the leak detector die that you installed into the system should leak out from wherever it may be escaping from, indicating the place of needed repair by means of a red or blue, or whatever other designated coloration the die gives out from the leaking area.
Please note: Not all home charging techniques typically work as there are many mechanical failure factors in an a/c system that may require a certified a/c technician to determine exactly why your system is not working should the home remedy fail.
I hope this helps you and remember to always work safe with eye and hand protection especially around freon gases which become extremely cold and can cause frost bite when contacting with the bare skin.

May 08, 2010 | 2001 Cadillac DeVille

1 Answer

A/c refill


Do you know if you are you connecting to the low pressure or high pressure lines, and are you really sure you need freon (which in this case is probably R-134A refrigerant and not really freon R-12)? It would probably be in your best interest to take your car to a reputable shop and have them fix your system. BTW, it never hurts to get several diagnoses and estimates.

Aug 22, 2009 | 1995 Acura Integra Coupe

3 Answers

Where is the valve to add refrigerant to my 2001 Ford Expedition's A/C system?...It does not blow as cold as it used to and I want to try this before bringing it in to the shop


I just did this on my f150 supercrew, which looks identical to my 2000 expedition. follow the freon lines, usually next to the battery, to the firewall. tucked against the firewall is the condensor and just above it is the low pressure access port. I topped off my freon using a kit with a pressure gauge. the before pressor was 40, and after the freon addition was 50. Made ALL the difference between a slightly cool AC and FREEZING COLD AC. Total cost with tax for the kit was just under $30. The kit inclued an 18 oz refill container (17 oz freon + 1 oz synthetic lubricant in the can) and reusable hose/pressure guage.

Jun 26, 2009 | 2001 Ford Expedition

2 Answers

How do I convert or fill 92 Jeep Cherokee air conditioning freon?


If it leaks 134 it will leak R-12 .I have changed hundreds of systems over to 134 without any complaints. Don't let the 94% eff rating of 134a scare you because that does not mean that your ac system will lose 6% cooling ability .A large class 8 truck or maybe a high roof van black on black and poor insulation might tax the system in the 90% range on 100 degree days but most systems never get close .
134a high side pressure will be about 18% higher so most systems you need to change the high side cutout.The R-12 electric fan switch will be ok just make sure it is engageing the fan when the pressure comes up.You must check the condensor in front of radiator to make sure air flows easily thru it.On systems where the hoses screw on each side of the dryer I replace the dryer .Drain oil from compressor and replace with 134a oil .Replace that bad valve core (with ac valve core not a tire valve) Now very very important vaccum the system and if no loss of vaccum in 20 min charge with manufactors recomended amount of oil and freon.If a system is low on freon (cycling in & out on low pressure switch) you can add a pound of charge with those small cans of same type freon no problem but when there is a leak and the charge has been lost or changing freon types you must pull a vaccum to properlly charge the system. If you just charge R-12 or 134a your system will have traped non -condensables and a large drop in cooling ability. Hope this helps. Harold

Jun 20, 2009 | 1992 Jeep Cherokee Sport

3 Answers

AC is not working


Sounds like the A/C system just needs to be recharged. When was the last time you had this done? Just take it in to your mechanic and he can do it for you and if that's not it for some reason, then he will be able to find the problem but most likely you need more freon added.

Benjamin

May 26, 2009 | 1995 Acura Integra Coupe

3 Answers

A/C blowing hot air. Compressor activates and system has pressure.


Could be the expansion valve. That's what allows the temperature to actually drop in the system - the contents of the AC system are under pressure, and are at a certain temperature. When the freon goes through the expansion valve, the pressure drops suddenly and dramatically, which "flash chills" the freon, allowing the air to blow cold. If it fails, you may get lukewarm air from the AC despite everything else working. Also though, check to see whether the AC evaporator fan (underhood) is working - on some cars, if it doesn't turn on, the compressor won't be run enough to cool the air.

Jul 29, 2008 | 2003 GMC Yukon

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