Tip & How-To about Refrigerators

Refrigerator, Freezer, Air conditioner Dehumidifier stops after minutes it switch on

The compressor overheating safety switches it off for protection from overheating and result in complete damage of the compressor.
One possible reason is the condenser is full of dust.
Remove the grille and either sweep away or vacuum dust that is readily accessible.
This easy cleaning should be done at least once a year for most efficient operation.
Loss of the refrigerant charge will also cause the compressor to overheat. It is the cool return gas coming back to the compressor that helps to keep it from overheating.

As you can see there are many things that can go wrong with an air conditioner and I have not come close to exhausting the possibilities here. I have just touched on the most common problems in a very basic way.
There are some basic trouble shooting things that can be done very easily. Most problems are above out of the range of comfort for many homeowners and professional help should be consulted before any attempt is made at repairs. Remember also, that the release of refrigerant gases into the atmosphere is a federal offense in the US. Proper care must always be taken to minimize the release of any gases. A license is also required to handle refrigerants. Make sure that the professional you call has the proper certifications to handle refrigerants properly

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1 Answer

1997 jetta ac works for one minute then warm air blows


check the refrigerant level. The compressor is running until the low pressure or high pressure switch switch cuts it off.

Running the unit without enough refrigerant will damage the compressor because the lubricating oil is dissolved in the refrigerant. This is the reason for the low pressure switch cut off--to protect the compressor from damage.

If pressure gets too high, the compressor seals will blow. Thus the reason for the high pressure switch. Too much refrigerant or too much air in the system (due to a leak) will cause high pressures.

If refrigerant level appears to be correct, then suspect trapped air from a leak causing a high pressure cut-off. If refrigerant is low, suspect a leak causing a low pressure cut-off.

Mar 02, 2011 | Volkswagen Jetta Cars & Trucks

1 Answer

Air conditioner stopped cooling. Dealer diagnosed evaporator leak, replaced the evaporator assembly, expansion valve, drier, evacuated and charged the AC system. One week later, AC stopped cooling, compressor does not run. Taking car back Monday. An expensive misdiagnosis?


It could be that there was more than one leak and the dealer found only one. The AC system has two pressure switches to protect the compressor from damage---a low press. switch cuts off the compressor when there is not enough refrigerant in the system, the high switch cuts off when pressures get so high they could blow out the seals. Both are a result of a leak--refrigerant leaks out and air can leak in. Air will compress and when it does, it gets hot--so no cooling, and pressures go way up. So the compressor may have been stopped by those protective switches.

Of course, there could be a bad relay or other circuit malfunction.

Another possibility is that the compressor sat too long before being repaired (but we are talking about weeks going by here, not days). The air and moisture (humidity) that leaks into the system during this time creates acids that will attack the metal reed valves in the compressor. On restart, the damaged metal valves eat themselves in short order. If this is the case, the compressor ran until it seized and will need to be replaced. This particular problem is impossible to diagnose. So the dealer may have done his best.

Feb 12, 2011 | 2002 Honda Accord

1 Answer

the compressor suddenly trip off and it runs and after few minutes it trip off again


Compressor tipping is typically due to overheating. A single bimetal disc thermostat (e.g. Klixon brand device) in located within the motor windings within hermetically sealed compressors which will cut off motor current after the local windings have sufficiently overheated.

Unfortunately, by the time this limiter has activated, the compressor motor and pump has typically already suffered mild to major damage.

Compressor overheating is typically a result of low freon. The freon, besides cooling the compressor, also carries the lubricant, so low freon results in a hot compressor with poor lubrication, with some degree of permanent damage by the time the internal limiter has activated.

There are a few other possibilities, depending on system design, but some version of the above scenario is typical.

When the compressor runs hot, this also initiates chemical changes in the freon and oil resulting in acids with further attack both the compressor pump, motor windings and motor bearings, a viscous circle.

Compressor overheating can also be a result of contaminants circulating within the freon or evolving mechanical failure problems within the compressor pump or motor.

Better systems (very few high end residential central AC systems) include OEM or field installed high freon pressure and low freon pressure cut out switches connected to circuits which stop the compressor and keep it off when pressure are well beyond desired.
These are far more effective in protecting the compressor and preventing permanent damage.

Additional protection options are a compressor discharge temperature limit switch (shuts off the compressor if the outlet freon goes well above desirable outlet temps), and a flow switch which sense adequate condenser fan air flow and only allows the compressor to run when adequate air flow is present (a second or so after the condenser fan has started). (Since condenser air flow is what removes all the system and interior heat, the compressor should not run unless airflow is appropriate.)

While all the above 4 safety device strategies are relatively inexpensive, they are not present in the vast majority of residential AC systems sold in the US.

Jan 06, 2010 | Carrier Heating & Cooling

2 Answers

the compressor clicking on and off


Remove that compressor relay and inspect ir. If it appears burnt or sound like a salt shaker it is most like bad. Take a look at these PHOTOS

Oct 08, 2009 | GE PSI23SCRSV Side by Side Refrigerator

1 Answer

air compressor does'nt kick in


you may have a leak in your ac system. its possible that the previous owner charged the ac to help sell the car. most newer cars have a sort of safety switch to protect the compressor from damage. if the ac pressure is too low, the compressor wont turn on. have a shop do a quick check of the pressure. it only takes a minute or so. if it is low, then thats definitely your problem. you will need to have the leak fixed and the ac recharged for it to work properly.

Sep 04, 2009 | 1997 Chevrolet Malibu

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