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#1 Old 03-18-2012, 08:37 PM
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A/C Recharge?

Hello,

I Bought my car used back in January my a/c was working just fine but the days have been gettin warmer here in chicago and the a/c doesn't seem to cool only somewhat and i was wondering if i might need a A/C recharge and whether i might be able to do it myself?
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#2 Old 03-18-2012, 09:45 PM
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kn5owa
Try putting the air control in recirculate mode - makes the air cooler.

Next, after running the a/c awhile, the suction line (insulated and with a cap marked LO) should be icy cold and wet.

Does the A/C compressor cycle on and off? - if it cycles too frequently (like every 10 or 15 secs.), it is low on refrigerant.

Charging yourself? You can buy all kinds of gages and refrigerant at places like Advance auto parts. The word is be careful. Charge only into the LO side with the can upright. Don't overcharge. The system only holds like 19 oz. so this is easy to do.

The pressure reading at the LO side should be around 25-40 psi with the compressor in the "cycled on" mode (running) and ambient temps in the 80 F plus range. When the compressor cycles on the gage reading dips, and the low reading in the "compressor on" mode is what you look at. Add R134a refrigerant as needed to get pressures in the stated range.

If the above doesn't work - be prepared to see your friendly local dealer and pay some big bucks.

Interdynamics makes a lot of the DYI A/C stuff and has a good web site.
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#3 Old 03-20-2012, 12:51 PM
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tsx271811
This is very easy DIY as kn5owa outlined above. The low port is easy to find and the R134 recharge bottles that come with the built in gauges are perfect and easy to use. I bought mine at advanced auto parts and used the online coupon codes with free in store pickup to make them even less expensive. they run $20-$30 (before coupon) and is money well spent. It will save major $$ over having the dealer recharge the system. After a quick recharge, my system was running chilly cold on warm days. Some people have had to recharge their system annually but most systems that dont have extended leaks should hold it for multiple seasons.

other tips that might help: wear some utility gloves or use a rag when attaching/ detaching the bottle to the port to protect hands from freon. be sure to spray the can a burst or two before attaching to the Low port to prime the line with freon. You dont want to introduce air into the AC system. The bottle port will only fit into the low port so that should make things easier to avoid mistakes. just monitor the gauge every couple of seconds after holding down the button to see how you are progressing in filling up the pressure. There is no need to rush. further, only fill up when the compressor is engaged and whirring...

here is a good step-by-step (for the older model, but steps are the same):
How to Recharge Air Conditioning with Freon in a Hyundai Sonata | eHow.com

$26.99 Recharge kit ($21.60 after 20% coupon)
Buy Interdynamics EZ Chill R-134a Refrigerant Plus Oil and Leak Sealer (14 oz.) SD-134 at Advance Auto Parts_____
20% off sitewide no minimum via code "P20"
or pad your order to $30 with utility gloves or something and make it $20 with below coupon.
$10 off orders of $30 or more via code "A123"
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#4 Old 04-24-2012, 06:55 PM
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Quote:
Originally Posted by tsx271811 View Post
This is very easy DIY as kn5owa outlined above. The low port is easy to find and the R134 recharge bottles that come with the built in gauges are perfect and easy to use. I bought mine at advanced auto parts and used the online coupon codes with free in store pickup to make them even less expensive. they run $20-$30 (before coupon) and is money well spent. It will save major $$ over having the dealer recharge the system. After a quick recharge, my system was running chilly cold on warm days. Some people have had to recharge their system annually but most systems that dont have extended leaks should hold it for multiple seasons.

other tips that might help: wear some utility gloves or use a rag when attaching/ detaching the bottle to the port to protect hands from freon. be sure to spray the can a burst or two before attaching to the Low port to prime the line with freon. You dont want to introduce air into the AC system. The bottle port will only fit into the low port so that should make things easier to avoid mistakes. just monitor the gauge every couple of seconds after holding down the button to see how you are progressing in filling up the pressure. There is no need to rush. further, only fill up when the compressor is engaged and whirring...

here is a good step-by-step (for the older model, but steps are the same):
How to Recharge Air Conditioning with Freon in a Hyundai Sonata | eHow.com

$26.99 Recharge kit ($21.60 after 20% coupon)
Buy Interdynamics EZ Chill R-134a Refrigerant Plus Oil and Leak Sealer (14 oz.) SD-134 at Advance Auto Parts_____
20% off sitewide no minimum via code "P20"
or pad your order to $30 with utility gloves or something and make it $20 with below coupon.
$10 off orders of $30 or more via code "A123"



Thanks I really appreciate the feed back and your detailed answer is exactly what I was hoping for.
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#5 Old 04-25-2012, 01:28 AM
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PGX_kiLlER
im sorry @ op for jacking his thread
but how often do you suppose to recharge?
im @ almost 80 k mile right now, bought car @ 67k mile
i don't know in past if previous owner has taken care of it already or not.
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#6 Old 04-25-2012, 01:35 AM
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You only need to recharge when A/C does not cool as effectively as before and that is typically due to low refrigerant levels.


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#7 Old 07-14-2012, 05:27 PM
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Quote:
Originally Posted by tsx271811 View Post
This is very easy DIY as kn5owa outlined above. The low port is easy to find and the R134 recharge bottles that come with the built in gauges are perfect and easy to use. I bought mine at advanced auto parts and used the online coupon codes with free in store pickup to make them even less expensive. they run $20-$30 (before coupon) and is money well spent. It will save major $$ over having the dealer recharge the system. After a quick recharge, my system was running chilly cold on warm days. Some people have had to recharge their system annually but most systems that dont have extended leaks should hold it for multiple seasons.

other tips that might help: wear some utility gloves or use a rag when attaching/ detaching the bottle to the port to protect hands from freon. be sure to spray the can a burst or two before attaching to the Low port to prime the line with freon. You dont want to introduce air into the AC system. The bottle port will only fit into the low port so that should make things easier to avoid mistakes. just monitor the gauge every couple of seconds after holding down the button to see how you are progressing in filling up the pressure. There is no need to rush. further, only fill up when the compressor is engaged and whirring...

here is a good step-by-step (for the older model, but steps are the same):
How to Recharge Air Conditioning with Freon in a Hyundai Sonata | eHow.com

$26.99 Recharge kit ($21.60 after 20% coupon)
Buy Interdynamics EZ Chill R-134a Refrigerant Plus Oil and Leak Sealer (14 oz.) SD-134 at Advance Auto Parts_____
20% off sitewide no minimum via code "P20"
or pad your order to $30 with utility gloves or something and make it $20 with below coupon.
$10 off orders of $30 or more via code "A123"

where exactly is the low pressure port at? I'm trying to do a DIY solution.

Thanks!
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#8 Old 07-14-2012, 05:52 PM
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Left side under the hood.
Should have a cap with an "L" on it it's twist off.
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#9 Old 07-14-2012, 06:14 PM
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Quote:
Originally Posted by RRey0456 View Post
Left side under the hood.
Should have a cap with an "L" on it it's twist off.
Thanks for the info... I see a yellow twist-off "L" by the washer reservoir and then a yellow twist-off "H" more by the front of the car. I'm assuming the "L" is what I need to do.

The car has been sitting in the Florida sun for about 2 hours since I last had it running. Should I worry about it being hot since it is sitting there or is this fine ambient temps?

Thanks
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#10 Old 07-14-2012, 07:51 PM
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kn5owa
Quote:
Originally Posted by justpino View Post
sitting in the Florida sun for about 2 hours since I last had it running. Should I worry about it being hot since it is sitting there or is this fine ambient temps?

Thanks
Hot is fine - that's when you need A/C - low press. side should be maybe 35-45 lbs approx when compressor is cycled on
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