Question about Dodge Ram 1500

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A SHOP TOLD ME I HAVE A BLOCKAGE IN MY AC...I HAD THE ORFICE TUBE REPLACED. STILL NO COLD AIR.THE COMPRESSOR CYCLES A LOT...2004 DODGE HEMI 1500 QUAD CAB ......BILL

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  • Dodge Master
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Bill, try another shop. You just cannot afford to diagnose via parts replacement, in air conditioning. A/C works by pressures and temperature measurements. If there was a blockage, which is very uncommon unless novices worked on the ac, the pressures would be totally out of whack.
Still, the orifice tube WOULD be the area that gets plugged, if that were the issue.
The cycling of the clutch may or may not be a clue. Normal function would have the unit cycle on and off, based on system pressures, and not time.

Essentially A/C works based on physics, like water. at a certain ambient temp, you have to have xxx amount of pressure to change the vapor of the refridgerant into a liquid, then at another lower pressure and temprature, the fluid changes back into a vapor. A shop that does not have these specs is clueless. Water at less than 32 degrees at most pressures, will become solid, and at 212 degrees, in absense of pressure, wants to change from liquid to vapor. AC works the same way, only pressure is a major piece of the equation.
I think another shop would be able to find this out. What worries me about shops that do not fully understand AC is they fail to address oiling, which is a math problem. For example if you were to have 2 oz. of oil in the compressor, on a 14 oz. system, and you found only 1 oz in the compressor you are short 7 oz, and not 1 oz. These are not specs, just an example... there is no substitute for training.



Posted on Oct 12, 2010

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