Question about 2008 Dodge Ram 3500

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2008 3500 55890 miles a/c just blows hot

It just started blowing hot .... fuse is fine compressor clutch moves freely but comp. wont engage .... any ideas also pressure is high

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You may have a high pressure problem or a high pressure switch defective also make sure you have good air flow clean condeser

Posted on May 30, 2010

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2008 Grand Prix GXP keeps blowing the 10amp fuse for the AC. When replaced, it runs cold again until I start driving, then it blows and only has hot air once again. Very frustrating in Texas heat!


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Not sure what you mean by diode slot empty.
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If yes, then you would check for voltage at the compressor relay and then the compressor clutch.

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My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

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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Check if the AC pump clutch engages (clicks in & out). Also check the fuse for it to start with.

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first id check see if hoses where it connects have oily residue on them , if yes then o-rings/hoses are leaking and need replaced, usually compressor wont kick on if low refrigerant.
also check fuse box, sometimes a fuse will blow, need replaced , kind of rare but happens. might also look aaat where there are high/low pressure sensors screwed into condensor by firewall , passenger side usually. use a small wrench and tap very lightly and them sometimes very rarely they stick. if so id replace.

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When i turn the a/c on it blows the a/c clutch fuse


The ac compressor is probably siezed. When you're turning on the ac it cant turn the compressor so its blowing the fuse. It could also be that the clutch windings are shorted.

That would be my first guess.

You can locate the wires on the compressor clutch that engage the clutch, remove the belt, and leave the engine turned off. Apply power from the battery to the clutch wires and see if you can move it at all with your hands. Use small gauge wire and maybe put in a inline fuse. If the clutch is burned up it will blow the fuse. I think the inline fuses are pretty cheap at a auto parts store. If its not burned up, and you cant move the pulley at all by hand, more likely than not you need to replace the compressor.

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Does the compressor magnetic clutch operate the compressor? If so, then the coolant has probably leaked out of the system. If clutch doesn't operate the compressor, possible fuse blown, bad relay, or open winding in compressor clutch.

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