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Heating & Cooling 4th Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 05-16-2014, 11:53 PM
Alina12901 Alina12901 is offline
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Default Help Please!! 2009 Dodge Ram A/C issue

Here is the issue and we can't seem to figure it out.
a/c just stopped working one day. we decided to try to fix it today and thought we had fixed it. Well we thought wrong!! It worked fine after we disconnected the battery to fix it. We walked away with a sense of accomplishment only to find out when we went back out an hour later to leave that the a/c was not working again. If we unplug the battery wait a few minutes and hook it back up the a/c works great until we shut the truck off again. Then we have to repeat the whole process again. We think it's something telling the computer after awhile to cut off the AC but have no clue what would cause it. We have checked every fuse and while imaginable and we are stumped. Any info would be greatly appreciated since we are suppose to be in the Low hundreds this weekend so that makes a super hot ride with no AC out here in the dessert!! Thanks so much in advance!!
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Old 05-17-2014, 01:01 AM
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RogerRamJet RogerRamJet is offline
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You've got a sensor gone afoul somewhere and it's telling the computer not to allow the a/c clutch to engage. Check for codes and see what comes up.
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Old 05-17-2014, 06:26 PM
Alina12901 Alina12901 is offline
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Thanks so much for the info Roger! One quick question for you, where is the sensor located and do you know the name of the sensor??? Thanks so much.
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Old 05-18-2014, 12:15 AM
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RogerRamJet RogerRamJet is offline
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You're welcome, April.

There's a couple of sensors that will do it on their own, high pressure and low pressure sensors. But those sensors will usually cut the a/c compressor without any help from the computer, meaning if they sense too high of pressure or too low of pressure, they just shut the compressor down. Since it works until you shut the engine off, then won't work again, I'm thinking the computer is getting a non-critical reading from a sensor telling it to not let the a/c engage on the next start up. That's why I asked if you could have the computer scanned to see if there are any codes stored in it.
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