Almost every single electrical system on a car is powered through some kind of switch or electrical relay, and the AC system and compressor are no exception. The AC compressor relay is responsible for supplying power to the AC compressor and clutch. Without this relay, the AC compressor will not have power and the AC system will not function. The AC compressor relay is no different then other electrical relays - its electrical contacts will eventually wear or burn out, and the relay must be replaced. When the AC compressor relay has failed or is beginning to fail, it will begin to display symptoms that indicate it may be time for it to be replaced. The AC compressor is powered by the relay. If it is not functioning properly, then the AC system will not be able to produce cold air correctly. When a relay is starting to fail, it may give weakened or intermittent power to the compressor, which will result in weakened or intermittent function of the AC. The AC may function fine in one instance, and then shut off, or deliver inconsistent performance in another.

This may be a potential sign that the relay may be going out. 2. AC compressor is not turning onbest window ac units 2011 One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all. gree split air conditioner user manualIn most cases, when the AC is turned on you will be able to hear the compressor switch on. ac unit rentalIt will usually produce a familiar clicking noise from the clutch being activated. If when you turn it on you do not hear the clutch being turned on, then perhaps it may not be getting power, due to a failed relay. 3. No cold air Another symptom that the AC relay has potentially failed is that there will be no cold air at all from the AC. If the relay fails, the compressor will not operate and the AC system will be unable to produce any cold air at all.

While there are several reasons as to why an AC may stop producing cold air, a failed relay can be one of the most common. If you are experiencing issues with your AC system and suspect that your AC relay has either failed or is beginning to fail, we recommend having it diagnosed by a professional technician. If your AC relay is found to be faulty, they will be able to replace the AC relay if necessary.Show All ItemsStep 1: Get Familiar! If you're having this issue click this link below!  It seems there is some money available or a possible repair to those with this issue that meet the qualifications listed. If you don't meet the qualifications, you're not interested in the red tape or just like the satisfaction of fixing things your self continue you reading and I will show you how to fix your TV for under 10$! Some tools you'll need going forward are a screwdriver, a soldering gun and some solder. Time to get this ship sailing!  Sometimes our cars, appliances, and even air conditioners make the strangest noises, but how do you know if they’re normal or if something might be wrong?

It’s not always as easy as hitting the ‘restart’ button on your computer, so it’s important to know when you should call a professional or contractor to check it out. The following are some tips about what sounds are normal and what indicates professional problem when it comes to your air conditioning unit. Outdoor unit noise is normal upon start-up and shut down.  The outdoor unit is where most of the mechanical operations in your system take place and depending on the type of equipment, it can be noisy and somewhat varied when it starts up and/or shuts down.  Typically, most air conditioners make noise when they first cycle on, which can be caused by the buildup of pressure in the refrigerant lines or from bearings, fans or other moving pieces starting up.  The same is true when the unit cycles off, or comes to a stop, as the pressures need to equalize.   Sometimes this causes a unique noise that sounds like air escaping, a click or rattle. : If the start-up and shut down sounds are the same from cycle to cycle and not too loud, it’s probably normal and not worth calling a contractor.

Outdoor unit running noise after start-up can also vary among different types of equipment.  Once the outdoor unit starts up, it should reach a consistent sound where you hear the fan blowing and the other mechanical parts humming along.  Sometimes you might hear a cycling sound over the period of a few seconds where the unit changes the pitch of its normal running sound and might get louder or quieter in “waves.”  If it gets increasingly louder as the system is running, then it might require a contractor to see whether it is out of balance or requires further inspection.  If you hear a loud, intermittent mechanical “scraping” or “banging” noise, this is not normal and you should shut your system down and call a contractor to inspect it as soon as possible. : Significant changes in pitch or ‘banging’ noises indicate you should call a contractor. Indoor unit sound is usually the sound of the fan moving air through your system.  It is most noticeable when the system turns on and off.

If you have a high efficiency system (16 SEER and over) you could hear two distinct sounds as your system moves from high to low cooling speed.  The high speed sound can be noticeable, but the low might be so quiet you can barely hear it. : Air moving through your system should sound smooth and consistent once it is running. In general, sound is a subjective attribute and the above descriptions are provided as a guideline for noises that could potentially signal a costly problem.  In addition, we have recorded some typical compressor sounds you might hear during a normal start up, run and shut down cycle as examples. Sounds like the ones you will hear in this audio file are typical examples of what you might hear during normal operation in a healthy system.Carl’s Corner – Auto Repair Help DIAGNOSE – A/C SYSTEM DOESN’T BLOW COLD AIR SYMPTOM SUMMARYThe air conditioning system is not cooling as expected. The air conditioning system may require an extended period of operation to reach the desired output.

USUAL CAUSELow refrigerant level is the most likely cause of poor cooling from the air conditioning. If there is no cool air coming from the air conditioning system, an electrical malfunction could be the cause. A defective relay, compressor clutch coil or damaged compressor are all possibilities. DIAGNOSISThe air conditioning system is equipped with safety switches that automatically turn the compressor off when the A/C refrigerant level becomes low. This prevents compressor damage, since the lubricant for the compressor is circulated through the system by the refrigerant. When the pressure switches are activated, power to the compressor is interrupted regardless of the position of the A/C dash switch. Recent regulations have prevented most consumers from doing the repairs. Special equipment is now used to remove the refrigerant, referred to as “evacuate” prior to opening the refrigerant system. Special leak detectors are used to detect leaks around hoses, fittings, and valves.