AC fan and Compressor not cycling properly and turning off

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Quote:

The AC works fine. It gets nice and cold.

The AC compressor does not cycle on and off. This appears to be normal operation for this GM vehicle (2006 ION 2.2L automatic). No problems with the AC.

The fan does not turn off when you turn the blower off. The fan does not turn off when you turn the AC switch off. I realize you said if the selector on the climate control is selected to defrost the AC will come on and fan on. My AC actually does not come on in this defrost mode. Not that I can tell. I looked at the compressor and it's not on during defrost. I guess to make this easier to understand I have to say my fan does not turn off unless you turn the engine off. That's it, it's on otherwise.

The fan will remain off if you leave AC off. It will come on if called for (due to temp getting high). Once its on, it's on. No shutting off until engine is turned off.

Is this normal operation? If your Saturn does the same thing then I would assume its normal....

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Why does my AC compressor cycle on and off is a common question that every AC contractor hears repeatedly. Cycling is part of the normal process through which your HVAC operates. It’s not the fact that your air conditioning system is cycling that is a problem, but the frequency that indicates problems.

To understand why cycling occurs you must first understand the principle of refrigeration within an air conditioning system. HVAC units use refrigerants repeatedly in order to operate in an economical manner. Chemicals such as R-22 and R-410a, both forms of Freon, move heat from an area, and then cool that location, followed by expulsion of heat to the outside. To accomplish this task, the air conditioning unit goes through a cycle of compression, condensation, expansion and evaporation. In other words, the liquid refrigerant absorbs heat as it changes from liquid to gas, and then gives off heat when it turns from gas back into liquid.

In this process, refrigerant...

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This is a discussion on AC compressor cycles on and off within the Automotive Support forums, part of the Tech Support Forum category. I have a 1998 ford escort with 140k under its belt. Here is the senario: My ac did not work


U.S. cars haven't had sight glasses since the late70's early 80's

lol...your probably right...that's why i like my old 1969 'Cuda Hardtop...two A.C. belts...and one waterpump/fan belt...still runs like new...don't drive it much...maybe a few times a year in the summer...

CUDA!?!?!?!? I had a '70, "Baracuda", 383 w/440 shaved heads, Muncie "rock-crusher" 4-speed w/Hurst shifter, Holly double pumper; N50-15" on rear (that's how they numbered tires back then); dual pipes with glass-packs

OH! . . .those were the days!!!!!!!






...
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How to diagnose these noises: clanks, clunks, cyclical, fan, groans, growls sounds at an air conditioner or heat pump.

Air conditioner or heat pump noise diagnosis & cure: this air conditioning repair article discusses the diagnosis and repair of air conditioning compressor noises which range in importance from normal (if annoying squeaks and squeals, to rattling loose bolts and hardware, to costly compressor damage indicating air conditioning compressor or A/C compressors at or near end of their life.

Green links show where you are. © Copyright 2015 InspectApedia.com, All Rights Reserved.

HVAC Noise Group 2

Article Contents

HVAC NOISE Group 2 - chattering, clanks, clunks, cyclical, fan, fog horn moans and groans, growls

Clanking Noises, Clunks, Thunks, Shoes in the Clothes Dryer:...

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WELL SIR.I STILL KNOW LITTLE ABOUT YOUR SYSTEM

THE DIAGRAMS DO SHOW ME A "ROAD-MAP", PERHAPS THINGS TO CHECK

1ST DIAGRAM SHOWS 2 FUSES. ARE BOTH GOOD?

THEN THERE'S THE RELAY JUST BELOW THE FUSES. DOES IT HAVE AN EXACT TWIN ELSEWHERE THAT YOU COULD SWAP IT WITH, FOR A TEST?

DIODE. JA TEST IT?

2ND DIAGRAM:

SEVERAL RELAYS IN IT THAT MAY BE "SWAPPABLE" WITH ANOTHER AS A TEST

YOU MIGHT TEST VOLTAGES TO THE DIFFERENT COMPONENTS WHEN IN DIFFERENT SWITCH POSITIONS

I HAVE NO MIRACLE CURE TO THROW TO YOUR. Sorry!

MAYBE YOU COULD FIND SOMEONE MORE ABLE TO READ THE DIAGRAMS AND OFFER OTHER THINGS TO TEST

AS YOU SAID IN THE BEGINNING THE OLE PCM MIGHT BE THE PROBLEM, I IMAGINE IT COSTS AS MUCH AS AN ENTIRE REAR AXLE ASSEMBLY FOR MY JEEP

JUST ASK---I WILL INITIATE A PRIVATE MESSAGE TO YOU, WHERE YOU CAN "PRIVATELY" GIVE ME YOUR EMAIL ADDRESS, NOT BROADCAST TO THE WORLD AS IN OPEN FORUM.I WILL SEND YOU BOTH VIN 4...

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Hey guys. New to this forum. I have a 95 stang that I just had refilled with freon and oil at Ice Cold Air. The compressor turns on then cuts off as if its low on freon but its not. Last night the ac started blowing cold and was this morning then started back on the compressor turning on then off. I know it has freon in it and is full. Could it be that the orifice tube is clogged or maybe even the drier? is this something that I could take off and try to clean out? Any help is greatly appreciated.

Sean

Did they just refill it, or did they actually service it properly?

A proper servicing includes fixing whatever component caused the leak in the first place, evacuating the system, replacing the drier (or exposing it to vacuum for a few hours) etc.

Generally, there is no servicing the owner can do because of the special equipment required for testing and repair.

IMO take it back to Ice Cold Air. If they did service it properly, they can test...

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©Don Vandervort, HomeTips

A central air conditioning compressor, located outdoors, should be cleaned before every cooling season.

Is your AC not working? If your central air conditioner is not cooling right, save money, time, and get comfortable again with these expert DIY air conditioning troubleshooting and repair techniques.

Need help NOW? Get a Local Air Conditioning Pro Fast!

In brief:

If your AC is not working at all:

1. Be sure it is receiving power at the electrical panel.
2. Reset the equipment’s switches and/or overloads.
3. Check the thermostat settings.
4. Check the condensate overflow switch.

If your AC is not cooling but runs:

1. Turn off the power.
2. Clean or change the filter.
3. Look to see if ice has formed on the coils and, if it has, turn on the power and the fan to melt it.
4. Clean the condensate drain.
5. Check and clean the outdoor compressor.

In...

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What is the function of an air conditioner?

The basic functions of an air conditioner are:

Maintaining the temperature to desired level. Humidity control inside the room (De-humidification). Proper air circulation.

The air conditioner attains the desired temperature according to the temperature set by its thermostat. The compressor in the air conditioner is turned on and remains on until the room temperature decreases to be the same as the temperature of the thermostat. Once the desired temperature is reached, the compressor turns off until the room temperature increases again. This turning on and turning off, of the compressor determines a cycle of the air conditioner. This concept is discussed in detail below.

What is the cycle time of air conditioner?

The cycle time of an air conditioner is the amount of time the unit runs to maintain the temperature of the room equal to the temperature setting of the thermostat. If the thermostat is set a very...

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I have a Lennox 12ACB30-4P Value Series manufactured in 1996. It came with the house I bought 3 years ago. The unit never gave me any problem until 1 week ago when it would not cool. The fan would run, but the compressor would not kick in. There was a buzz every 20 seconds or so.

A tech was called based on the sticker on the unit (original installing company, but the residential service was sold, the new company still have service records.)

First tech looked and the wire was disconnected from the capacitor. He replaced it and cleaned it. All was well for 3 days, and there was no cool air again. The buzz returned in an interval of about 1 minute.

Called the company back and argued about cost of having to fix the same problem twice. Second tech came out the same day. The wire was disconnected again. This time, he replaced the capacitor and said the fan is running is reverse and would cost $400 to replace.

I thought I was crazy as I remembered the fan running in...

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seen in Truck Trend

Question:

I'm experiencing a problem with my A/C compressor. It's never engaging when I hit the button to turn it on. I stopped at a car shop yesterday and they told me it's charged with Freon and that they think it is an electrical problem.

Well, since I'm an electrician not a mechanic I figured I might be able to troubleshoot the problem. All fuses seemed to be ok by sight and checked good with my meter. The larger relay in the electrical box had continuity between two diagonal poles.

Sorry for the length of the question, just trying to be informative. Thanks a lot, and I forgot to tell you it's a 2000 model Chevrolet Silverado 1500 with the 5.3-liter V8.

Answer:

Trust me, there's never too much information in a reader's question, unless there's 12 questions in a reader's question. Note: a U.S. built 2000 model year truck uses R134a refrigerant, not Freon (R12).

OK, you're on the right track. If the...

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Car Air-conditioning Compressor

I get a lot of questions about car air conditioning systems not blowing cold enough. Especially during hot humid summer days. Most people would like to see frigid cold air blasting from their small dash vents instantly upon request.

Now that this page is getting some heavy traffic I am adding some additional information and a new “Simple Fixes” video at the bottom along with some related tools and equipment for people who want to take it to the next level. So lets get that cold air back.

Remember when your car has been baking in the sun heat is stored up in large quantities and must be removed before it starts to feel cool inside. But what if the air does not seem to get cold after 5 minutes?

There are many factors involved that affect the actual output temperature at the dash AC vents. To follow will be a few examples of common problems that I find when inspecting a car air conditioning system that is not performing as...

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Air conditioner or heat pump compressor burn-out diagnosis & repair:

This air conditioning repair article discusses the how to diagnose and replace a burned out air conditioner compressor, including evaluation of air conditioner compressor noises, hard starting, lost cooling capacity, and detection of a burned out compressor or A/C compressors at or near end of their life.

Here we catalog and describe the causes of air conditioner or heat pump compressor failures and we suggest compressor motor diagnostic steps.

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How to Diagnose a Burned-Out Air Conditioning Compressor

Article Contents

When a sealed compressor motor has "burned out" this means that the internal wiring of the motor has become...

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I have watched over the years dealership good will strategies. They seem to be practiced by most brands but is certainly very evident with Honda.

Take known issues like the poorly designed air conditioning vein type compressors in the CRV's or the known faulty engine blocks in the Civics..You go in with a legitimate claim..let's specifically label a claim that I consider quite legitimate and fair, even though technically it might be out of wty. And this very example is known on this forum in at least two different cases I believe..about a year or so ago..one had 40k miles, another had 54k or so but, the owners made their claim about 6 months outside of wty. That's where the technically being out of wty comes in..but wait! We have a KNOWN issue with these claims, and some mileages have been way less than the original warranty period, but only having breached it in terms of time, and sometimes not very much time past wty..This compressor issue is a really good...

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Two questions? Engine running at 1000 rpm. AC on Max fan, Max cool.

1) What is the low side pressure

2) What is the high side pressure

This can be diagnosed with pressures. To have a full system and restricted flow will show with very high pressures on the high side of the compressor.

This is your problem. Try this: Run cool water over the condenser. See if that helps the temp inside.

(By fans you mean external fans right? Not inside blower -- that's all working ok?)

Last edited by jedblanks; 07-02-2009 at .

And the high side pressure is?

Reed valves? Are you referring to the ones in the compressor or do you mean the orifice tube. Most a/c have either...

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Hi all, my apartment maintenance is becoming frustrated with coming out to fix the ac. They spent hours messing with it, told me the ac is working, then I found out it wasn't working properly.

Wondering if anyone have any ideas...

Initially, I thought it was the filter, so they changed that. My apartment went from not getting cool enough to completely hot - 90+.

Yesterday maintenance told me it wasn't working properly because I didn't have the switch turned all the way on auto. (This wasn't true. The switch was on, the air was blowing, but not blowing cold enough.)

Today, they finally got it back to reading under 90, but the same problem persists even though they swear it's working now. Two days in a row, he came in, stood under the air vent which was blowing barely cool air, reading about 90, then he'll smile and say, "See, air fixed now. You feel it?" (Ugh, I know I don't know anything about ac's but at the same time, seems he's playing me for really dumb so...

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