A/C blows warm air above 45mph - JeepForum.com

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post #1 of 21 Old 07-22-2011, 09:44 AM Thread Starter
05WK98TJ
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A/C blows warm air above 45mph

My 98 TJ blows outside temperature air inside the cabin even when A/C is on at speeds above 45-50. Anything lower than that it blows ice cold air. Anyone know where I should look first for problems?

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post #2 of 21 Old 07-22-2011, 09:51 AM
Robert J. yates
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I'd start with checking the compressor clutch.... sounds like it could be cutting out. It has a really close air gap tolerance.

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post #3 of 21 Old 07-22-2011, 09:57 AM Thread Starter
05WK98TJ
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I have no experience with A/C systems so could you please give more detail on how to do this?
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post #4 of 21 Old 07-22-2011, 10:03 AM
JBTJ
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Mine had a vacuum leak at a canister that was located under the battery tray. A rubber hose had a crack in it. You have to get on your back with a flashlight and look up under the tray to see it.
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post #5 of 21 Old 07-22-2011, 10:04 AM
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post #6 of 21 Old 07-22-2011, 10:55 AM
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Spend $25 and get a refill kit with a gauge.Typically 97-99' Tj's get vacuum leaks that stop the A/C from blowing out of the vents at any load of the engine(higher speeds).If it doesn't switch to defrost vent only,recharge it.
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post #7 of 21 Old 07-23-2011, 04:57 PM Thread Starter
05WK98TJ
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Ok now I have a new problem the A/C compressor makes a ticking/whirling noise sounds like a bearing. It makes this noise whether the A/C is on or off. Am I looking at a new compressor or is there a cheaper way to rebuild it?
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post #8 of 21 Old 07-23-2011, 06:49 PM Thread Starter
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Anyone? The AC system might just need a recharge cause it's dry so that's what making the noise? Does that sound right?
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post #9 of 21 Old 07-25-2011, 09:48 PM Thread Starter
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Bump. I also noted that there is little noise from compressor when AC is on but when I turn it off it makes a loud rattling noise. And noise increases when engine is under load.
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post #10 of 21 Old 07-26-2011, 12:52 PM
oldmots
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Sounds like the clutch bearings are bad, fairly cheap to get fixed, just take it to a good shop. They'll put in a new clutch.
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post #11 of 21 Old 07-26-2011, 02:40 PM
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Quote:
Originally Posted by 05WK98TJ View Post
Ok now I have a new problem the A/C compressor makes a ticking/whirling noise sounds like a bearing. It makes this noise whether the A/C is on or off. Am I looking at a new compressor or is there a cheaper way to rebuild it?
You are correct, you now have two problems, one is you have to fix your clutch or risk severely overheating your rig when the serpentine belt gets tossed off when the clutch locks up and the second is your vacuum leak causing the blend door to default to the heat side.

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post #12 of 21 Old 07-26-2011, 02:43 PM
seadoons
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How does one go about checking for a vacuum leak? Is there a way to use a machine to pull a vacuum and to see if it holds?
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post #13 of 21 Old 07-27-2011, 01:32 PM Thread Starter
05WK98TJ
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I found something else out when the clutch or pulley(whatever it is) is not spinning I hear the grinding noise but when it is spinning there is a whining noise probably from the belt.
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post #14 of 21 Old 07-27-2011, 06:46 PM
YJ_TJ_JK
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Have an experienced Tech check out that clutch. But, I think that it's a vacuum leak. When you get above 45, it's starving for air. How's your idle with the a/c on? Jeeps have cracky vac hoses all over. Start with a bright light and closely examine for cracks in any thin vac. hose. Look everywhere under the hood and underneath. Don't forget to check the hoses that lead down to the front diff. too.
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post #15 of 21 Old 07-27-2011, 06:54 PM
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Don't forget to check the hoses that lead down to the front diff. too.
There are no vacuum hoses going to the front axle on a TJ...
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