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Do All AC Systems Use Freon?
All air conditioners use a refrigerant, whether it's your car’s HVAC system, a central heating and air system, or your home’s refrigerator. Refrigerant is what makes the system operate. Refrigerants are compressed from gas to...

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AC malfunction
Hi there, thanks for writing in about your 1994 Mercedes-Benz 300D. This sounds like you may have a leak in your A/C system. I would start by checking the various fittings and hoses for leaks. Check the hose manifolds on...
Air conditioning blowing hot. 2006 Scion tC
If your A/C compressor clutch isn't engaging, the most common cause is low refrigerant in the system. The only way to check this is to connect an expensive machine to your car, remove the refrigerant and weigh it. Doing other...
My a/c suddenly stopped blowing cold air, i noticed the clutch on the a/c compressor isn't engaging
Hey there, thanks for writing in about your 2007 Dodge Nitro. The clutch will not engage if the system is low on Freon. Your next step would be to have the system pressure tested to see if there is Freon...
AC stopped working after Freon was added - 1994 Dodge B350
There are a few areas to consider when dealing with air conditioning problems. First and foremost, the system requires a proper full charge of refrigerant in the lines and working fans both under the hood and in the cabin. If...
A/C blowing hot air, filled 3 weeks ago with freon and helped now freon not cooling it.
Your car uses a refrigerant called R134a. Freon is a trademark for a different, no longer produced refrigerant referred to as R-12 (Freon is also a trademark for certain other refrigerant compounds but NOT R134a) and was last used in...
Air conditioning works, but during longer trips it becomes weaker and weaker.
First thing to do is check the refrigerant charge level, typically via gauge (high and low) pressures, although note that gauge pressures do not perfectly coincide with what is intended to be the factory specified amount of charge (measured very...
My A/C only blows cold on recirculate
Hello. You will always get colder air when on recirculate. When taking in the outside air the A/C system will be able to drop the temperature coming in by about 20 to 30 degrees. This means if the outside air...
air conditioner pump making noise and no cold air. no power coming to pump in 2011 nissan rogue
Hey there, thank you for asking about your 2011 Nissan Rogue. When the compressor pump starts to make noise, combined with not blowing cool air, there are many possible problems. It is quite possible that the compressor itself has frozen....
AC issue - 2008 Dodge Charger
Hi there. If the compressor is turning on and if the pressures are correct, then the lines need to be checked. If one of the lines going into the firewall are cold then the system may be working fine. If...
Is there any simple way to diagnose why my ac won't blow cold?
Hello. I will help you with this issue. If the a/c compressor is NOT running (and thus NOT creating suction in the refrigerant piping on the low side) and you apply a gauge to measure system pressure on the low...
Warm AC on 2011 Jeep Wrangler
Hello. The A/C has to work harder in the Florida weather since it is hotter and more humid. It will take longer to cool down the interior in that region. You may be just low on Freon and should have...
AC compressor good or bad idea put
You must have a massive leak in the system if you put in two cans and still nothing registers on the gauges. The entire system should be full if you put in two cans. For this issue I would suggest...
AC blowing hot air - 1998 Honda Accord
Odds are that your A/C system has a leak somewhere. If it needed freon in the first place, then you added some and it's blowing warm air again, that's a fairly good indication of a freon leak. The best solution...
The A/C
The smoke you've seen is most likely the A/C evaporator leaking in the dash. The only way to fix it is to remove and replace the evaporator. If you try and recharge it then the Freon will just leak out...
freon leaking every 2 months
Hello. The system should be vacuumed down and recharged adding dye to it. Wherever the freon leak is the dye will leak out along with it and will show up a fluorescent orange/green/yellow with a black light depending on the...
The Freon leak will in most cases not leave any evidence of where it leaked from. There are many possibilities in the system to leak. The evaporator in the dash is one of the major area that will leak and...
My car shuts off whenever I turn on the AC
Hi there. It sounds like the compressor itself is failing. When it fails internally the compressor binds which can cause an extra load on the engine which will cause it to run like this. I usually install a pressure gauge...
I am trying to recharge the Freon for the A/C but I have been unable to find what the pressures are supposed to be.
Hello. A/C pressure readings vary with the temperature. The A/C system should be charged by weight and not by pressure to fill it correctly. There should be a sticker located under the hood (either on the underside of the hood,...
AC blows warm air, Freon was recharged.
Hi there. When the freon was recharged, was the system evacuated and a vacuum test performed to ensure there are no leaks or moisture in the system? It sounds like the AC compressor may not be engaging. A blown fuse,...
A/C Compressor Turning On/Off
Hello, thanks for writing in about your Nissan Xterra. Your vehicle has a temperature thermistor and a thermo control amplifier on and in the evaporator case. This can cause the problem you are having as long as you are not...

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