Air conditioner isn't blowing cold! Fan works okay but air isn't cool. Can hear hissing sound that sounds like normal compressor function. Do I need a coolant recharge?

It sounds like the fan is working, but to produce heat (or cold) the compressor has to run. Can you hear the compressor running? If you put the unit into AC cool mode, can you get the compressor to run? You may have a blown fuse or circuit breaker or other problem preventing the compressor from running.

sounds like overload/ relay cutting out on compressor
cools for a minute or two then cuts compressor out leaving fan only to work

Is the compressor running? Normally the fan starts first then the compressor. You should hear it start. New units could take up two minutes. If you hear the compressor start and no cooling you have lost the refrigerant or a bad compressor.

It sounds like your freezing up at the coil, which in turn, blocks airflow across coil and only a small amount of air comes out of the vents. This also explains the cold air coming from fan on the outside unit, since the system cannot absorb the heat from the inside of the house through the coil. Your air outside is usually blowing out warm to hot air because thats the heat it rejects out of your system. I would turn the thermostat to "OFF" and turn just the fan setting to "ON" instead of Auto, this thaws the system out faster. Give it time to fully thaw, make sure filters are clean, and check airflow. If airflow is back to normal, your problem is more than likely the charge of refrigerant. If you have to call a technician out, make sure the unit is not frozen at all before they get there, they would not be able to do anything with the system froze. Hope this helps and good luck!

Hi,Whynter Portable Air Conditioner has many moving parts, and they all make noise and cause vibrations. Some of these parts are more likely to causing shaking and loud noises, and sometimes this signals a larger problem, something to watch and scrutinize. If serious enough, it calls for a repair.

Loose Parts

Loose parts cause the majority of shaking and vibration noises in your air conditioner. A few of the most common loose parts include the air compressor, the piston rods and even the fan or blower unit itself. These noises are clunking, clanking sounds that occur along with a vibrating action. The only method of repair is a complete compressor replacement, which is a repair only a certified air conditioner technician is qualified to make. The compressor is a fully sealed component, so individual parts in the compressor cannot be repaired.

Fan Blades

Fan blades cause noise, shaking and vibrations even when properly secured. If fan blades contact the exterior structure of the air conditioner due to a bent fan blade or broken and misaligned grate, a constant, repetitive noise and vibration results, which sounds like a ticking or banging from the interior of the air conditioner. Vibration in this case is limited but still present.

Mounting Brackets

When an air conditioner shakes, there is a problem with the mounting brackets. These brackets hold the air conditioner compressor steady as it operates. Normal vibrations and shaking would otherwise occur without these brackets. A loose mounting bracket causes the air conditioner to rock back and forth and creates a clanking sound. As the compressor starts up, this rocking and clanking sound begins, resulting in a very loud and fast vibration and noise. It also occurs when the unit shuts down.

Other Sounds and Vibrations

Sometimes air conditioners squeal, hiss, hum or screech. Each noise is often accompanied by a vibration. Humming sounds along with a vibration may indicate a bad capacitor, the electrical part responsible for starting the machine. Hissing sounds tend to indicate a pressure problem while screeching and squealing sounds are fairly common in window air conditioners and in central air conditioners. This sound is also a result of the compressor motor. It usually starts when the unit turns on and continues through its normal operating cycle. Vibrations always occur in the air conditioner due to moving parts and the compressor motor's operation.


Hope it helped..

sounds like the outdoor fan motor and/or capacitor needs replaced. The compressor will run for a short time because the fan is not pulling the heat out of the system, it can cause damage to the compressor if the fan is not repaired, Ruud used a 3uf capacitor rating for the outdoor fan motor, if the motor has been changed make sure the proper capacitor is also changed for the new motor rating.

You need to determine if the compressor is running, if it is and you have no cooling then you either have lost charge or bad compressor, these units re not worth replacement compressor

It sounds like the compressor is not coming on. It may be the thermostat. Take the metal wire with the fat end, make sure not to kink the wire, this is the sensing bulb Warm it in your hand. If you hear a click it works and you need a new window unit. They cost as much to get fixed as a new one. If the thermostat does not click then that is the problem.

You will need 12 vdc (battery or converter) for controls to work, and 115 VAC (hydro) for fan & compressor to work. With your fan obviously working, that tells me you have both already but compressor may not be kicking in. Do you hear a "moaning" sound or see lights dim when switched to cool?

it has very low amount of freon left. best economical decision is replace unit.