Car a/c Won't Hold Charge?

I had the same thing on my Chevy truck. It kinda sucks, but you have to take it to someone that does air conditioning to have them (1) charge the system, (2) use a leak detector to find where the leak is coming from. Once they know this, they can (3) "uncharge" the system, (4) fix the leak, (5) remove all the air from the system (requires a vacuum pump) and then (6) recharge the system again with freon and oil.. Yeah, I know, it seems silly to charge it twice, but that's about the best way to find out where it's leaking from. And the cost will depend on where the leak is - there are a lot of parts on an auto AC system - it could be a compressor, a bad valve, a loose connection, a crack on a hose or in your condenser or evaporator, etc... the tester will tell the tech where the leak is. As to cost? My leak was the compressor; it cost about $165 for the compressor, another $70 for the refrigerant freon, and a few hundred to get the system charged, tested, evacuated, fixed, re-evacuated and re-charged - about 4 hours work. Go to a mechanic that does air conditioning work (it requires specialized training and equipment - not all mechanics can do it!). But believe me, getting it fixed - especially in this heat - was worth it (plus the defroster worked again in the winter!!!)

1. evaporator coil ice buildup?

One thing I can say with relative certainty; If the compressor is running constantly and not short cycling on and off then it is a sealed system problem. Within a half to an hour of turning on a warm refrigerator you should have a full frost pattern across the entire evaporator, not just the lower third. Unlike most units this one brings the refrigerant in to the bottom of the evaporator first. If the compressor is running that tells me all the controls are good because first and foremost they are responsible for turning on the compressor. It is not generating the pressure needed to cool well. It could be a leak but that is unlikely for a couple of reasons. One, a power outage wo not cause leaks. And second, leaks do not fix themselves so it should be getting progressively worse. And unless it was an incredibly slow leak after 4 months I would assume it would not be cooling at all by now. It could be a restriction like a plugged filter/dryer. That would be good news because it would not require a new compressor. Then again the compressor part might still be under warranty, that is if unrelated to a power problem which I would not mention. GE compressors are expensive so if the part is covered that is a big plus. It is possible since you are cooling some that the problem existed prior to the power outage. The unit may have been able to maintain temps but once warm does not cool enough to cool everything down. I would go with that. haha. The likely reason you are not defrosting properly is that the defrost terminator, the bi-metal, is located at the very end of the evaporator run and is not getting cold enough to allow a defrost or shutting off early. Sorry it is not an easy fix. Good Luck

2. can you replace a 10 seer evaporator coil with a 13 seer?

I do not know what someone told you about evaporator coils;...... the seer rating is computed by the running of the condenser unit (which houses the compressor) AND the inside fan and the fact that the two are power usage devices. The efficiency of the cooling effect has everything to do with the energy saving measures built into or added to the structure. If you want to increase the surface area of the evap that you have now, it would just be a matter of properly managing the metering device in order to operate the evap coil the way its designed to operate....

3. Can an auto ac freon leak fix itself?

If your freon leaks out, you need to fix the leak. Leaks can be caused by several things. A bad hose, seal leak, or ruptured metal part, such as condensor, evaporator, metal line etc... The best bet would be to find the leak. Usually the leaking area will leave oil at the point of fault, so you may be able to look over your system by following the hoses out of your compessor, and check all the items you see. Some shps also use a flourescent dye in the system, that can be added when you fill with freon. This will help show a leak when you shine an ultra violet light on the system to spot the area of leak. Another way would be using an AC leak detector that kinda sniffs for any freon leaks ( of course you need freon in your system for it to work ) Now if you were to try and fix a leak with AC system stop leak type of stuff.... This would only work with a seal leak, and more than likely a smaller leak that what you seem to have. In other words, if in fact your system is leaking from a seal it will swell the seals to help in sealing, but that only goes to work so much...

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What Is the Proper Way to Clean a Evaporator Coil?
If you are cleaning the outside of the coil, the condensate pan, etc., I would use degreaser and water. Cleaning the inside of the coil should be left to a pro.1. 98 Buick Lesabre evaporator coil?Unless you are taking it out and replacing it, there is no reason to access it. There is nothing serviceable. But anyways, it under your dashboard, in the same ductwork as your heater core. Get to it through the glove box, or underneath, taking off the lower ductwork.2. Help with central AC and copper tubing from evaporator coils?Regarding your condensate drain tube - is your home on a slab or pier and beam ? If you are on a slab you should be able to walk around and look until you see a stream of water exiting the house. If you are on pier and beam you would have water pooling under the house, and that might be a very bad thing, so you want to get under the house and look for the tube. Some people have the water drain into their sewer system, which can be done with a floor drain or into the water drain pipe for the washing machine. As for the people who service the AC unit, I suggest you take several photographs of your problems and then personally visit a business that services AC units and discuss with a manager your frequent problems, then visit another service business with that information and see what they tell you. Once you decide on a service company it helps them to have everything known, on a checklist, before the service tech arrives on the premises; the checklist is to ensure all of your questions are answered.3. What's the Difference Between the Condenser and Evaporator Coils?The evaporator and condenser coils in an air conditioner are heat movers. One extracts heat from inside your house and the other dumps that heat outdoors. The end result of this process is a cooler, more comfortable indoor environment. In addition to getting the heat out of the house, the evaporator coil performs the function of reducing humidity. Because moist air holds heat energy, lowering the humidity promotes more effective cooling. Central air conditioning is a closed-loop system. What flows through that loop is refrigerant - a substance that readily absorbs heat energy, shifting from a vapor to liquid state and back again. Through an insulated conduit connecting the coils, refrigerant flows from the indoor evaporator coil through the system compressor to the outdoor condenser coil, then loops back to the evaporator. Here's how the evaporator and condenser coils perform the heavy lifting of keeping your house comfortable: Cold refrigerant vapor passes through the evaporator coil tubing as warm indoor air is drawn through coil air passages by the air handler blower. Heat energy in the air conducts through the copper surfaces of the coil and is absorbed by the frigid refrigerant. The refrigerant flows through the conduit to the A/C outdoor component. A compressor pressurizes the refrigerant, concentrating heat energy and converting it to a hot liquid as it enters the condenser coil. Rapid condensation inside the condenser coil tubing causes the hot refrigerant to convert to a liquid state and rapidly release the stored heat energy. As the condenser fan pulls air through the coil passageways, this heat is dispersed by aluminum coil fins into outside air. Liquid refrigerant now completes the return trip to the evaporator and the process repeats. We are your source for residential and commercial services in the Norfolk County area.4. why does an ac unit being low on refrigerant cause the evaporator to freeze up?The freon enters the evaporator through a thermal control valve. The pressure drop causes the freon to change from a liquid to a gas and in doing so cools the evaporator. If the freon is low the pressure at the output of the evaporator falls below its normal level and with freon, pressure is equivalent to its temperature. Normal output pressure for R-134a should be above 30 psig ( 34.5 degrees F), if it drops below 28 psig (32.2 degree F) there is a chance the evaporator can freeze.5. What kind/size of Evaporator Coil do I need for a 2.5 Ton Trane A/C Condensor (XB12)?You sure thats not a HEAT PUMP? XB12's were heat pumps. If memory serves me that was on a 12 seer rated. So in this case you going to want to get a R410A 13 Seer 2.5 Ton cased coil. It will match the system as closely as it was originally designed. The system is R22. You will not find the proper matched "12 seer coil" A R410A Evaporator Cased coil will work fine. Which will be rated for R410A / R22. You also going to need a Bi-flow liquid line drier. You going to need to consult with an HVAC company to complete this installation as this will be WAY over your head. And if Im correct if this is a heat pump, your going to have to change out the thermostat or you can just wire it up for cooling only if you have a gas furnace.
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