Tip & How-To about Air Tools & Compressors

When using the ac on a hot summer day,or a mild spring day,the compressor runs all the time.If you set it to low,and turn the temp to cold or toward the warmer side,lets say cool,then the ac compressor runs also,it just cycles,on,and off.No matter what setting you are using on your ac control,the ac compressor stays on,using fuel.Get the most out of your ac,while it uses your fuel,to keep you comfortable.All vehicles have a MAX setting,or a recirculate setting.Always use this setting.I say,always use this setting,not only that,but use this setting.I stress this because you are pulling in air ,from the out side,that is warming the evaporator,and making the ac work harder to give you comfort.In the hot ,hot summer,the settings MAX,and recirculate,keep the air that is in the vehicle,in the vehicle.It recirculates the air,instead of bringing hot air inside the vehicle ,and bringing the temp,up,to a warmer temp.A lot of people don`t even know that this is on the control,or don`t know what it is for.Some times the recirculate button,or dial,will have a picture that looks like a C,but squared off at the corners.So folks,get more out of your vehicles cooling and heat system.Yes ,this will work on heat also,maybe not defrost,but on some cars,it will work.

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Not staying cool


sounds like it is either low on Freon or the compressor is going out. The blowing ice cold is an indicator that it may be freezing up because the low Freon. when it stops blowing cold, turn it to fan only mode and see if it gets colder again. If that is the case then the unit is low on freon and freezing up. I know that sounds confusing but that is how AC works. The low freon pressure means the gas is expanding too fast and the air flow cannot take up the cold from the evaporator fast enough. Turning the compressor off and keeping the fan on will alow the room air to take up the cold.

Apr 22, 2014 | Frigidaire FAM157S1A Air Conditioner

1 Answer

I have a 2000 Dodge Ram 1500 that will blow cold and hot air for only a few minutes. After that is only ambient air temps. It is a 5.7 ltr, automatic with only one set of climate controls. The heater core is not leaking nor are there any other leaks visible in the system. The ac is charged and shows good on the low side. Can someone please enlighten me on a possible fix. Winter is soon approaching...lol!


you say it will blow cold and hot air for only a few minutes. You don't say but I assume you mean will blow cold a few min. when turned on AC max , blow hot only a few min. when turned to heater hot. Assuming thats the situation and you say AC charged and shows good on the low side -you should charge the AC to a full charge on the low side will cause problems with the AC air compressor kicking on and off. I suggest while the engine is running and turned to AC cold max watch the AC air compressor clutch to see if it does indeed kick on and off if so charge completely. As far as the heater make certain you coolant is all the way to the top and the best way to do this is when engine is completely cold remove radiator cap and fill completely and completely close cap then fill overflow container just to the cold level. That should fix your problem.

Sep 06, 2011 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

I have a 2004 Nissan Xterra. It is not cooling like it should. I changed the two filters behing the glove box. I checked the pressure and it is good. The compressor is coming on and sounds like the clutch is working, but it is not blowing cold air. What else could I check?


When you say you checked the pressure did you connect gauges to the high and low sides to get both pressures, this sounds like it may be low. also what is the temp coming out of the vents. note on really hot days and humid the ac system doesnt cool as good unless the truck is moving down the road or highway and does take a while to cool down. at a stop or sitting or in traffic the ac temp will rise as the condensor needs to be cooled like the engine does, if its not cooling then the temp will not be cold, check the front of condensor for blockage, also make sure the fan is running with ac on. this fan should run when ac compressor is on,maybe clean condensor with water hose blowing from radiator outwardto front bumper, then make sure the hot/cold blend door is closing all the way,a quick test is to turn a/c on, turn temp control to hot and see if it gets hotter then back to cold and it should get colder. this sounds like the system may just be a little low. have an a/c tech check it, you may find its low or nothing is wrong. good day.

Aug 08, 2011 | 2004 Nissan XTerra

1 Answer

A/C air sometimes cold, sometimes not on VW Beetle 2001 Turbo


AC will not work with temps are cold even when it is turned on. The air is colder cause the temp is colder. The AC cycles in hot weather because the AC charge is low and needs recharging. You will know this if you open the hood run the AC and you will hear the clicking sound of the AC compressor magnetic clutch. You can recharge it easily buy buying a compatible can of refrigerant. I suggest buying the kit with the gage so you don't overcharge the system which will cause freeze ups

Jul 03, 2009 | 2001 Volkswagen Beetle

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