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Heating & Cooling 3rd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 08-01-2010, 02:59 AM
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Default intermittent ac issue

ok, i'll try my best to describe what's happening intermittently. start the truck, turn the ac on - air starts to cool a little. the air will turn warm and there is a low hissing/vacuum sound from the passenger side of the dash for a few seconds. as soon as that sound stops the ac gets cold like it should. it's done it 3 or 4 times in the past two weeks, the exact same way (only when the truck is started)
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Old 08-01-2010, 03:28 AM
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I forget, what's the warranty like that Dodge offers? Is yours still under warranty?

I'm not to particular in AC or heating systems so I can't give a solid answer other than what I stated above.
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Old 08-01-2010, 11:34 AM
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Kinda makes me thing you're hearing something in the evaperator. Have you checked the R-134 level and pressures?
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Old 08-01-2010, 01:56 PM
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i was hoping it wasn't freon related - two months ago i had the system serviced. how low would the freon have to be to cause issues?
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Old 08-01-2010, 02:06 PM
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Typically about 1/2 pound or so.
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Old 08-01-2010, 02:18 PM
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my neighbor is an a/c mechanic on semis. he is going to hook it up to the gauges tonight.
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Old 08-03-2010, 03:54 AM
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freon was a little low - i had a feeling i would have problems, when i was at the shop getting it done - the machine ran out of freon halfway through and they had to hook up another tank. it nagged at me enough that im not surprised the truck was low.

luckily my neighbor is a ac guy for semis and refrigerated trailers, he did his ac thing a jug of 134 and the truck is like a meat locker inside once again.
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Old 08-03-2010, 08:02 AM
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The machine we use won't let you run the tank empty. If it doesn't have enough in it for a complete charge, it won't start the cycle. Glad you got yours fixed.
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