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Not cooling, when turned on after a few seconds makes hissing noise like air leaking, fan not coming on, area over fan hot to touch

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Needs servicing to get working properly.
Not suppose to get hot either.

Posted on Apr 10, 2015


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Engine makes hissing noise. Valve cover or just a gasket?

Soounds like it to me.... But to be sure, knowing the make, model & year of the car would be a huge help!

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Working but not cooling

Check and make sure its on cooling mode and just not "fan only"

You should be able to hear the compressor start up a few seconds after the fan starts. One easy way to tell if an AC is working on cooling is it should be blowing hot air outside and cold air inside. If not, you may have a gas leak or the compressor is not starting..

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My freezer is located in a garage that is staying hot in these 90 degree temps. I just heard a noise coming from it, looked and stuff was thawing. Husband unplugged and noise has stopped fills like cold...

I would first check to make sure the the condenser coils are free of debri and there is not something against the fan.

Did the noise sound electrical or mechanical or a hiss. A hiss is most likely a freon leak or a compressor blown (usually not worth repairing). A mechanical sound could be something blocking a moving part like a fan. Electrical could mean about anything.

I would check the condenser grill and then plug it back up and try to tell where the noise was coming from.

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Temp gauge up to normal when you turn on fan it blows hot air for a minut then starts to blow cool air

sounds like a vacuum leak going to mode door. u have one that enters in through the firewall where the evap. is. Also some of the vehicles have on the control head a vacuum well actually it is controlled by the vacuum and check for leaks there i have seen that listen for a hissing noise and move it back and forth to see if noise changes.

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Our air con runs, on heat, and after a time cuts out, blows cold and makes a sort of hissing noise (but not a real hiss) and then shuts down. It then restarts after a couple of minutes. Is this normal?

Yes.Think of a heat pump as a A/C in reverce in cool indoor coil is cold&outdoor coil is hot.Naw indoor coil is hot &outdoor coil is cold&fan is pulling in cold air from outside.its going to iceup& go into defrost cycle.If your unit has a timed defrost every 30,60,or90min.(witch ever yours is set for)Defrost control board checks a sensor on cond.coil,if it is frozen unit goes into defost.You will here a swishing noise,iis the reversing of will also notice the outdoor fan is not operating&at termanation of defrost fan will blow out steem.the other metod is on demand defrost.when coil freezes unit defrosts.

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1 Answer

Refrigerator not cooling...makes hissing noise

From your problem description I would say it sounds like maybe the condenser fan is not running. If that fan does not run, the compressor will overheat, and get very unhappy, LOUDLY. There is a fiberboard cover on the back of the unit, unplug the unit, remove the cover and inspect the fan, it should turn freely if you nudge it with your finger. If it does not turn freely, you will need to make it so by lube, removing foreign object (dead mouse once for me) dust dragons etc... or replace the fan if necessary.

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Is it normal for my laptop to blow hot air from the blower fan and doing some noise every 20-30 seconds?

Not sure which laptop you have but this it is common for this to occur. The noise is the internal cooling fan coming on and this is why you get hot air coming out. In warm conditions some laptops have their fans on all the time.

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I am sorry but i failed to mention the hp l1706 monitor i have makes a hissing noise when on thank you to ghasson for answer but maybe you could help again

a hissing sound from a monitor if its not coming from internal speakers but inside the case, try looking through the air vents with the lights turned out and the brightness reduced. If you see a blue light inside the computer it is usually a High tension leak. Better not to touch it and please turn it off and have it serviced. Opening it up and touching it could be lethal get it to a repairer

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1 Answer

Radiator electric cooling fan cycles on and off every few seconds

Had the same problem with a Neon same age as yours. Mine started after driving through a large snow storm that packed snow under the hood. Turned out there is a relay or sensor for the fan that had to be replaced. Once this was done the problem was fixed.

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