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A/C not very cold

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Old 06-17-2014, 12:19 AM   #1
ThaiCobra
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Default A/C not very cold

Summer just hit here in Atlanta and daily temps are around 90'.

I noticed in traffic today, when I am running my A/C it doesn't seem very cold at all, its hardly cooling the car. I definitely remember when the car was new (2007) that it blew very cold air.

Any ideas about that? I changed my coolant 6 months ago, and I think my ratio may have been a little off. I think I could have used as much as 60% - 70% antifreeze to water. Could this be the issue? Just trying to think of everything.

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Old 06-17-2014, 12:25 AM   #2
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coolant won't have anything to do with it,
Turn on your ac and see if the fans are on. they should come on within a few minutes.

If they don't come on, theres your problem.

Also, look at the AC compressor, the pulley spins separate from the clutch. See if the clutch is engaging at all.
If its NOT engaging, check for power/ground. No power, Check fuses or pressure switch

If you do have power it could be a bad compressor.

If the clutch is engaging on/off very fast, it could be low refrigerant.
The ac compressor clutch will not engage if the refrigerant is too low.

Check for oily spots on your ac condenser, quite often, a rock will puncture it and you'll loose all your refrigerant,

Best thing to do is to take it to a shop (independent/trusted of course) that does AC. have them evacuate it and recharge it. that will tell you how much was in there.

If you need help troubleshooting, keep the questions coming. I specialize in AC systems
i can go into detail about any of the things i said above if you need help.

-Chris
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Old 06-17-2014, 02:20 AM   #3
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Does the compressor kick on and off quickly? If it does, then you are low on freon. Mines been leaking at one of the quick connect fittings for years. I rarely use my a/c, don't sit in traffic and work in a freezer all day.
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Old 06-17-2014, 12:11 PM   #4
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Last summer mine was blowing hot air on a 100+ day. Wouldn't get cold. I also hadn't used it in several months. Went home. Let the car sit and started it the next day. It worked fine and has worked fine after that. Don't panic yet.

It seems if I don't use it for a while it takes a little assistance to get working properly.
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Old 06-17-2014, 02:38 PM   #5
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Been having the same issue in my 2012 lately. We've had a few 100+ days and I'd get nothing but hot air blowing. Lately it hasnt been TOO bad, upper 80's, low 90's so it's bearable. Hoping it's just low on refrigerant and not a leak or something. Keep us posted if you find a solution.
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Old 06-17-2014, 02:43 PM   #6
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make sure its not overcharged as well. you can get a cheap gage from the local parts store that you attach to the low side port. only read the gage when the ac compressor is running or you will overcharge system. the ac being not very cold and not working are 2 different problems. mine is kinda cold and gets colder with the rpms and speed im driving. on a side note, turn your defrost on and see if the ac compressor comes on. it should as to remove humidity from cab.

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Old 06-17-2014, 03:26 PM   #7
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My '06 wasn't getting very cold (100K miles) last year. I just bought one of those 134A kits, put in 1 can and it's nice & cold now. Easy Peasy. Just read the directions. Be sure to get a kit with a gauge.
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Old 06-17-2014, 07:41 PM   #8
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If you are sitting on the highway in traffic, the engine isnt getting any quality air at all. In fact, the only air it is getting is probably well over 100 degrees due to the highway and all the other cars on the road. As traffic begins to unwind you should feel the A/C begin to get colder. Drive your car on an empty road and see if you still have the same problem.
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Old 06-18-2014, 01:26 AM   #9
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Quote:
Originally Posted by Lethaldosage423 View Post
coolant won't have anything to do with it,
Turn on your ac and see if the fans are on. they should come on within a few minutes.

If they don't come on, theres your problem.

Also, look at the AC compressor, the pulley spins separate from the clutch. See if the clutch is engaging at all.
If its NOT engaging, check for power/ground. No power, Check fuses or pressure switch

If you do have power it could be a bad compressor.

If the clutch is engaging on/off very fast, it could be low refrigerant.
The ac compressor clutch will not engage if the refrigerant is too low.

Check for oily spots on your ac condenser, quite often, a rock will puncture it and you'll loose all your refrigerant,

Best thing to do is to take it to a shop (independent/trusted of course) that does AC. have them evacuate it and recharge it. that will tell you how much was in there.

If you need help troubleshooting, keep the questions coming. I specialize in AC systems
i can go into detail about any of the things i said above if you need help.

-Chris
Wow, thanks for the information Chris! But I have no idea what any of that stuff is...

where is the....

- AC compressor
pulley
clutch
- fuse for the AC
pressure switch
- AC condenser
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Old 06-18-2014, 01:28 AM   #10
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Quote:
Originally Posted by Goldenpony View Post
My '06 wasn't getting very cold (100K miles) last year. I just bought one of those 134A kits, put in 1 can and it's nice & cold now. Easy Peasy. Just read the directions. Be sure to get a kit with a gauge.
Thats kinda what I am hoping, that I just need to put some of that freon stuff in it.

I'm taking it to my Autozone today, the guys there have been great and really seem to know their stuff.
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Old 06-18-2014, 01:29 AM   #11
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Originally Posted by 07 Cervini View Post
If you are sitting on the highway in traffic, the engine isnt getting any quality air at all. In fact, the only air it is getting is probably well over 100 degrees due to the highway and all the other cars on the road. As traffic begins to unwind you should feel the A/C begin to get colder. Drive your car on an empty road and see if you still have the same problem.
Yeah it def goes beyond being in traffic. Even cruzing down the highway doing 80, and I have it on "MAX AC" it still hardly blows cold. It is slightly cold, but just slightly.
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Old 06-18-2014, 08:56 AM   #12
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is your car black?
surely ac has a hard time with a black car?
mine does for sure...
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Old 06-18-2014, 11:24 AM   #13
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Quote:
Originally Posted by Goldenpony View Post
My '06 wasn't getting very cold (100K miles) last year. I just bought one of those 134A kits, put in 1 can and it's nice & cold now. Easy Peasy. Just read the directions. Be sure to get a kit with a gauge.
Any particular kit you'd recommend?
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Old 06-18-2014, 10:10 PM   #14
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AC systems can be very temperamental. you must have the correct amount of refrigerant in the system for it to work properly.
The over the counter cans are easy and convenient but its hard to get the refrigerant level exact.
your car requires 1.63lbs of R-134A. too much or too little creates issues with the pressures and the system won't work.

Id recommend taking it to a shop that can evacuate and recharge the system. They will take out whatever R-134A is left in the system, place it under a vacuum and see if it holds. If it holds vacuum, they will then recharge it with the correct amount and they should put a dye in it. If it doesn't hold vacuum, you have a leak and it should be easy to find.

Once its recharged, see if it works. Does the compressor engage? Does it get cold? are the pressures correct? (the shops AC machine should be able to perform all of these tests)

The AC compressor is belt driven. It is on the Right (Pass side) at the bottom. The pulley will spin with the engine running. The clutch spins separately. When the ac is turned on, a magnet pulls the clutch in and it spins with the compressor pulley.

Im not sure where the fuse is but if the AC compressor clutch is engaging then power shouldn't be an issue.

Use google to see how the compressor clutch engages. most AC compressors are the same setup and youll see what I'm taking about,

If you have no idea still, take it somewhere. AC systems aren't cheep to fix unfortunately.
The entire system is under pressure. (even if the AC isn't working, it could still be under pressure) so it can be dangerous if you don't know what you are doing.
Good luck and again, feel free to post any other questions!
-Chris
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Old 06-18-2014, 10:11 PM   #15
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If you have a shop recharge it and put a dye in it and it works fine for a few days but then stops working, take it back and they will use a UV light to detect the leak for ya
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Old 06-19-2014, 01:34 AM   #16
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Quote:
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If you have a shop recharge it and put a dye in it and it works fine for a few days but then stops working, take it back and they will use a UV light to detect the leak for ya
Thanks Chris! Taking it to the shop tomorrow!
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Old 06-19-2014, 09:40 AM   #17
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Quote:
Originally Posted by Lethaldosage423 View Post
Best thing to do is to take it to a shop (independent/trusted of course) that does AC. have them evacuate it and recharge it. that will tell you how much was in there.

-Chris
Chris, how do you evacuate an AC system?
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Old 06-19-2014, 06:32 PM   #18
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SO...

went to the autozone today. love those guys.

Bought some AC pro can for $40. It includes the gauge and the can of freon. We cranked up the engine and put the gauge on. The needle was swinging back and forth the whole length of the gauge. So the guy said this means there is a leak somewhere. He said, if its a small leak its not a big deal, but if its a big leak, i need to get it fixed pronto. We put a full can of 134a in it, and even then he said it could use a little more. The AC is now cold, but def not as cold as it was when I first got it. I'd say it's about 75% of its potential.


Click the image to open in full size.


So now I will just wait for the next 2 - 3 weeks and see what happens.

Thanks for everyone's help!
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Old 06-19-2014, 08:26 PM   #19
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Quote:
Originally Posted by ThaiCobra View Post
SO...

went to the autozone today. love those guys.

Bought some AC pro can for $40. It includes the gauge and the can of freon. We cranked up the engine and put the gauge on. The needle was swinging back and forth the whole length of the gauge. So the guy said this means there is a leak somewhere. He said, if its a small leak its not a big deal, but if its a big leak, i need to get it fixed pronto. We put a full can of 134a in it, and even then he said it could use a little more. The AC is now cold, but def not as cold as it was when I first got it. I'd say it's about 75% of its potential.


Click the image to open in full size.


So now I will just wait for the next 2 - 3 weeks and see what happens.

Thanks for everyone's help!

Leak, large or small is still going to empty out within a few weeks.

take a look through the grille of the bumper. In front of the radiator you have the AC condenser. It acts as a radiator for your refrigerant .
see if there are any oily looking spots on it. it may not be covered in oil but if a rock came up and hit it, you'll see the area where its leaking. That is the most common cause of an AC leak.

If thats not it it could be anything as minor as an O ring in a line or as major as an Evaporator core. (that is located under the dash (like a heater core but for AC)

Good luck.


66and06stangs, Evacuating the system pretty much just means emptying it out.
I highly DO NOT recommend you do this but if you take off the service port cap on the AC lines there is a Schrader valve (like a valve stem of a tire) you push it down and it will spray out. ITS UNDER PRESSURE and its dangerous to your eyes, lungs, and the environment...lol...
the correct way is to hook up an air conditioning service machine. It connects to the high and low pressure lines of your AC system at the service ports and safely recovers the refrigerant.
The machines run about $4000 so your average weekend warrior mechanic will most likely not have one.

My usual opinion when it comes to servicing an AC system is to take it to a shop who specializes in AC. Reason being is it can be dangerous and if people go overcharging the system or replacing parts they aren't really sure are bad, your wasting money.


Ill type up a testing procedure for checking AC systems if you like, maybe the mods will sticky it.
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Old 06-20-2014, 01:07 AM   #20
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Thanks again Chris, I will def take a look soon.
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Old 06-20-2014, 01:07 AM
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