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Old 08-03-2014, 08:51 PM   #1
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AC Questions

I have a few questions about my ac. I have a 98 GT. It blows ice cold while I'm driving and blows powerful, but when I come to a stop it blows cold still but not as cold and not as powerful as well. I charged it about a month ago with the kit from the parts store. I made sure I didn't over charge it. Any ideas why this happens? My other vehicle is newer and doesn't do this. Does it have anything to do with it being almost 17 years old??

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Old 08-03-2014, 10:38 PM   #2
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Could be age. As a personal rule I don't use those ac fix/charge in a can. Had a bad experience, used one and compressor went, coincidence, maybe. Had to file a claim with company, they paid half the repair for new compressor. I'll spend the extra fee bucks to take it somewhere for a full ac service next time

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Old 08-04-2014, 04:09 AM   #3
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Maybe as your alternator slows down it just doesn't have as much power? My old car did that before the alternator decided to quit

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Old 08-04-2014, 02:04 PM   #4
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AC Questions

I'll argue that when you come to a stop or even a creep that less air is moving through your grill compared to normal driving speeds. So, less heat radiates out of the a/c system.


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Old 08-04-2014, 03:09 PM   #5
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Quote:
Originally Posted by escottcarp View Post
I'll argue that when you come to a stop or even a creep that less air is moving through your grill compared to normal driving speeds. So, less heat radiates out of the a/c system.


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I agree.
There isn't room to put a very large condenser on these cars and the grill opening isn't very big. That's the reason that the radiator fan always runs while the A/C is on.
I also agree that, most of the time, A/C service is best left to the professionals who have the correct equipment to do the job properly.
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Old 08-04-2014, 07:32 PM   #6
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my vote is age. the ac unit is probably not as efficient as when it was new, due to use. higher rpms cause it to run faster and overcome its ineffeciency, but it wont function as well at idle
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Old 08-04-2014, 08:43 PM   #7
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Thanks for all the replies. I have an appointment set up for Wednesday with an AC shop. they're going to drain everything out of it and put new freon in it, and check the whole system out for me. Yeah I've come to realize that when it comes to something like ac system you want to let the professionals handle it instead of me guessing thanks.I will keep everybody posted. thanks again

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Old 08-05-2014, 09:47 AM   #8
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Good choice. An HVAC guy once told me he loves those DIY cans of Freon. It generates a lot of business for him when people destroy their A/C system.

Yes they can be a stop gap for a system that has a slight leak that can't be located but most people don't read the instructions and figure if half a can makes it cold, the full can will make it even colder.
Big mistake.
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Old 08-15-2014, 06:34 PM   #9
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I got the car inspected at the AC shop. Everything on it seems to be running fine as far as the AC system but he did tell me that my alternator was weak and by having a weak alternator that can cause the AC to generators slow when I'm at idle. I'm getting ready to replace the alternator but I was looking online and because I have a sound system in the car and lights I was thinking about getting 150 amp alternator. The car comes stock with a 130amp alternator. My question is by putting a little bit bigger size amp alternator in it will it burn anything else out cause its sending out too much power

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Old 08-15-2014, 07:05 PM   #10
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Nope. Larger amperage wont negativly affect the voltage. It will still be 12 volts, you will just have more of it available.
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Old 08-15-2014, 07:45 PM   #11
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Now by having more voltage available will the AC blow stronger at a stop because there's more voltage pumping than the 130 amp. I read that at a stop the 130 amp only pumps out 60 volts at stop and the 150 amp pushes out 80. Will it help my ac while idling at the light??

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Old 08-15-2014, 07:50 PM   #12
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I believe that my brand new (rebuilt) Motorcraft puts out around 100 amps at idle.
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Old 08-15-2014, 09:07 PM   #13
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If you are running a system that is drawing alot of amps, it is best to upgrade your alternator. I am currently running a 150 ampr now due to my system.
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