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Cooling problem with my ac.

My compressor is working properly and its cooling is also good, vaotage is also around 220V but compressor doesn't start on time. It starts after a long period and even if it starts, it stops within 15 minutes without cooling the room enough.

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The start capacitor may be the problem. Is your AC a central unit or window unit? Whats the model and make? If a window unit it could also be the thermostat is defective or too close to evaporator fins. Dirt on the condenser outside can cause the motor to heat up to the point it shuts down to cool the internal overload. Let me Know, Sea Breeze

Posted on May 18, 2009

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Why cools the ac only 1 hour full power and never reaches the set-point temperature ?

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I suspect that because it is working the problem is outside the ac control
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What could be wrong with my Goodman CPLE 42-1.

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Duo-Therm AC not cooling

If the unit is a 220v, you will see 110v on that unplugged wire you mentioned. If it is 110v system then you probably have a swollen or open capacitor. The lil black box on the control board is a micro relay. And they do act up in different ways. If it's clicking, normally, that tells me its working. If it's 220v, make sure you have 220v to the system. If you have 220v to the system, and no power goilg through the micro relay, you can try jumping by that relay. While it's plugged into the relay (both wires), touch the 2 wire ends together with the end of a screwdriver for a second or 2 and listen for the comp to start. If it does you found your problem. All this does is bypass the relay by connecting those wire together. I've seen these units not work, if there is 2 units on the roof, due to a safety that doesn't allow both to operate at the same time, and never found the reason why. Now if it's 110v, you'll need to dig a bit more, following your voltage. Source, line, load. The source volts enter, the line feeds to the switch(s), the load is the motor/comp. The capacitor is a round/oval metal cylinder with wires attached, and stores voltage so it must be discharged by shorting the terminals to each other or ground. POWER OFF FIRST! Be safe please. If its 220v and you only have 110, check the breaker(s). If the capacitor is swollen up on top, where the wires connect, or have this sticky oil coming out of it, it's damaged. More that likely its the board. Last 1 changed was $129 my cost, not the customers. And I had to rewire the unit a bit and change the tstat also. So if you end up buying a board, ask them about an exact replacement. If it's not, ask them if they can draw you a schematic to help. Hope this helps!

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Ac doesn't turn on - 2006 scion xa

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May 30, 2012 | 2006 Scion xA

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On my BMW 325XI Wagon, the ac is not cooling, the drier, expansion valve, compressor & ac control module have been replaced. Starts to cool as low as 65 degrees & then compressor shuts off.

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2 Answers

I have a ''GE"heat &

Look at the wires that go to the compressor and make sure they are not burned off. Inspect the capacitor tops for swelling and loose or burnt wiring. Also check the connections coming from the controls. May have a wiring problem or even a bad compressor. How old is the unit?

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My 2002 Expedition air conditioner will sometimes blow hot air and others cold air

I would check the following possibilities:
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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

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1 Answer

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If you're main power is 115v and the capacitor is rated 220v it could work. But if the other way around the capacitor would melt or blown if use.

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1 Answer

Change from 220v to 110v on air compressor

I can't blame you for askig, but here's my response. 5 HP is 3750 running watts. or about 35 amps at 110 volts and it would take somewhere around 50 amps to start it provided the motor could even be wired for 110 which I don't believe it can and for that exact reason. I'm sorry, but it's just not practical.

May 16, 2009 | Coleman Air Tools & Compressors

2 Answers


Ok, there should also be a service disconnect near the condensing unit usually a 6'x8-10" or so grey box, you need to check this and make insure that your 220v line voltage is getting thru. Sometimes this disconnect is a breaker sometimes fuses and sometimes just a bar type plug ( if the disconnect is tripped the problem is likely a clogged condenser coil, proper cleaning will be needed to prevent it from tripping again) If this is not tripped and you are getting 220v to your condenser then you need to confirm that you are getting the 24v control voltage to the compressor relay from the transformer in the indoor section. If the indoor fan can be controlled at the thermostat it proves that your transformer is good and you have 24v available, you should be able to hear and see (if your looking at it) the compressor relay engage when the thermostat is set to call for cool and the compressor delay on circuit has expired (usually 5 min). If the relay is not engaging then look for a wiring problem between the condenser and the furnace. Do you have dogs that run near the condenser? I often find Improperly secured t-stat wires getting pulled loose or chewed up by the family pet. You should have found the explanation for the fault at this point GL!

Jun 10, 2008 | Heating & Cooling

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