Not cooling the compressor cycles on but it is not blowing cold air

The cold that you describe may be just unconditioned air? If you are certain you can hear the comp operating for a couple of minutes, and then the heat starts, I would guess it is a reversing valve issue if it's a heat pump and it probably is. Or the control board acting up. I've had a lot of issues with the boards in the Amanda PTAC units. I can't remember how to configure it, but if you Google "Amanda ptac configuration", there is a lot of info online. May try a reset method first. Hope this helps!

it depends on thermostat setting. compressor might be going off on a safety.

Low freon will cause the compressor to short cycle, when the compressor runs the pressure in the low line is pulled down and the low pressure switch turns it off. Not running the pressure builds up and turns it back on. In the old days there was no low pressure switch, with no freon to carry the oil the compressor was destroyed.

could be low on coolant..in AC system..

Hi, the reason for this is the location of the evaporator core, its on the passenger side, a low charge will cause the side nearest to core it to cool more. Your cycling of compressor concures with this scenario. Recharge system to specifications.

Is the freezer itself getting cold.To blow cold air.the freezer should get cold/friezed.the cold air blows from freezer to fridge side.first the freezer side gets cold, then when the freezer side gets enough cool to its set cooling temperature, at that time the defrost cycle starts.In defrost cycle the fan in the freezer starts running and the cool air from freezer starts going to fridge side.There is a ventilation passage between fridge and freezer from where this cool air passes.---------------- If in your case, the freezer is getting proper cold, but its not blowing cold air from freezer to fridge, then possibility is that, there is a blockage in ventilations.But if ventilation its clear, then its defrost problem.First try manual defrost reset procedure. The procedure is as follows: ---- First unplug the unit from main power outlet. Then empty whole unit completely. Then keep both the doors open. Wait for 24 hours. All the ice collected on the coils and in the freezer section will get melted. Clean the water from the sections. Then Connect the power cord of the unit to main power outlet after 24 hours/.Then set the temperature to normal in both fridge and freezer section. It will take near to 4 hours to get run in its proper cooling cycle. Then check, if the problem returns again. Then its defrost board problem. ------------------------- BUT if in your case, the freezer section itself is not getting cold, then the problem is compressor related.The compressor is the part which cools the freezer frost.In the compressor, there is a refrigerant to cool the freezer.If the compressor gets weak or the refrigerant gets low, then it will not cool the freezer, if the freezer is not cool then it will blow warm air from freezer to fridge, in defrost cycle.In that case, the compressor is faulty and its the cause of problem.------------ So you will have to first check , that is your freezer getting cold or not.as per that you can start the troubleshooting.------------------

You can get required parts from from online sites like: --- www.repairclinic.com or from searspartsdirect online site. --------- This should help.Thanks.Helpmech.

I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

If the a/c fails to continue to blow cold there could be a few problems you can look for. First once you activate the system check to see if the compressor kicks in. You will hear the compressor humming . Once the a/c quits cooling go and see if the compressor is still running. If its not running its probibly gone into thermal overload (compressor overheated). If that is the case then you need to check to see if the coils are icing up if they are icing up then the problem is with 1) air flow restriction filter dirty, coils dirty simple repairs there replace filter, clean evaporator coil with a coil cleaner that can be purchased at a home repair store cleaning the condensor coil the same. 2) system is low on freon in which case the system will need to be recharged. Also, If you have a digital thermostat replace the batteries that may also be of some help. Good Luck on repairs



Dave

The low side pressure seems ok the high side would help,Is your compressor cycling and is the air coming out even slightly cool?slight over charge cold effect cooling ability.I wish I could be more help. I will have to think about this one.maybe you could make sure your temp.door is actually in the commanded cold position.

I think what happens is that you're burning out the compressor. If you got the windows down while you're blowing the a/c? it's working over time which is why they have two cycles. The image that displays the circle motion is meant for the windows to be up and the charge will last longer and with the windows down...click the one that shows outside air coming into the car. It might not be as cold as the other option but at least you'll have some cool air while you're at it.