Question about 2000 Jeep Grand Cherokee

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Where to replace refrigerant; no cold air blowing

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  • mwright11200 May 09, 2010

    How would you verify that the compressor is engaging the clutch on the compressor?

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Ac lines under the hood carry r134 through the ac system. there are high pressure lines and low pressure lines. each side has an opening for service. it is not uncommon for the system to lose refrigerant and either be less efficient or not work at all. to add freon to the system runs the risk of overcharging which will cause the system to run less efficient and possibly cause damage to the compressor or seals. the charging or adding of freon is always done to the low side and you can identify the low side by the size of the line. you will see there are two obvious sizes of lines. find both connection points first and make sure you know you are dealing with the larger lines which is the low pressure side. attaching to the high side could cause a can to explode and you could be injured!! with the engine running and the ac on its coldest setting with the fan at maximum speed you open the freon can with it in the upright position. verify that the compressor is engaging the clutch on the compressor. cans usually contain about 12 oz of freon. stay away from the mixes that try to give you stop leak and lubricant. try one can and see what you get. about those lines the size of the high side is like a pencil and the low side is like a magic marker. that should help you identify them. if you need more please reply and good luck

Posted on May 09, 2010

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My air conditioner is blowing warm air on the driver side and cold on the passenger side


see this steps and think with clearly and logically NOT feared. God bless you
checkmark.gif Start with the compressor. Does it engage when you turn on the A/C?
If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).
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If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor.
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01 Sebring convertible, AC was low on refrigerant, and would stop blowing cold air and start blowing warm air. I added refrigerant, and it worked perfectly for about 20 days. Now it blows cold, then it...


First of all if your system was low on refrigerant there is a leak.You can recharge and exspect the air to work,how long it will last depends on the size of the leak.Somtimes the refrigerant can have a leak prevenative but this is for very small leaks.You need to have dye put in to system and use black light to find leak.they make kits at your local auto parts store that you can buy and do this your self.If you say it worked well for about 20 days, that is a fairly large leak.The reason why the compressor is acting so erractic is because the freon has oil in it and lubracates the bearings in compressor.When the system goes low the compressor will turn on and off to protect itself.Eventually it will stop running completly.Idont think you have an electrical problem,Ithink you have a big leak.Try what I said and good luck....Brian

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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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Hi there. When a compressor is replaced, two things are in fact being replaced - both the compressor and the refrigerant (Freon) and if the problem is resolved as a result which of those two replaced elements caused the original problem? Well you will never know and so before the compressor is replaced you need to have you’re A/C system recharged – it’s by far the most cost effective initial thing to do. In general A/C systems loose at least 10% of their effectiveness each year through loss of refrigerant and so given the age of your car; it’s the first thing to focus on. A professional A/C centre will also be able to tell you whether your compressor is working properly after having a refrigerant recharge by the monitoring the operating pressures in the A/C system.

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