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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #11  
Old 08-11-2011, 01:29 AM
JW3146 JW3146 is offline
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[QUOTE=Screamintrashcan;587844]I find this thread quite interesting. I have a 98 which has the same problem, with a twist, and I have always done my own ac maintenance., the compressor was still acting quite normally, and the tubing under the hood was doing a great job of sweating.



No I believe we have two different problems. When my A/C goes out the compressor is done as well and piping is hot. Yours sounds more like a blender door problem.
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  #12  
Old 05-29-2012, 08:19 PM
mrjukebox160 mrjukebox160 is offline
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I see know one has an answer for this yet. I have the same problem though mine seems to be heat related. A/C runs great on highways. On hot days in stop and go traffic after about 20 minutes it shuts off. If the truck sits for about 45 minutes or so the A/C will start working again. The charge is full, I bypassed both the high and low cut offs, and replaced the control relay which still is pulling in even when it stops working. The engine shows normal temp even on the hot days and since the relay is staying engaged the PCM is not at fault. The only thing I didn't check is if there is 12 volts at the plug of the compressor when it stops working. I wish I could find a wiring diagram to see if I'm missing something. I also wonder of there is a thermal cut off in the compressor or clutch. I hope someone figures this out.
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  #13  
Old 06-05-2012, 04:44 PM
gmugmu0 gmugmu0 is offline
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JW3146,

Did you ever figure this out? My '98 1500 is having a very similar problem and it would be great if someone had some good advise.
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  #14  
Old 06-23-2012, 05:01 PM
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gunfighter gunfighter is offline
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mine is doing the exact same thing. A/C works for a short period of time and then just goes away, same bad smell and hot air. Today I checked the freon, good, when I checked the pressure it to was good, let the truck idle for like 30 minutes, A/C ran cold enough to keep beer cold in the cab, but as soon as I gunned the engine, took it above idle the A/C died off and I checked the pressure, it was way high. I too am curious about the fan issue, I have a brand new radiator, and am going to convert the whole system over to electric fans for cooling the truck. if anything changes on my part I'll let you know.
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Old 07-07-2012, 03:13 PM
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Here's an update on mine, the A/C is still doing the exact same thing as before. Next step will be to remove the freon and vacuum the system and retry.
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Old 08-01-2012, 05:57 PM
mrjukebox160 mrjukebox160 is offline
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I found the problem! There is a 2 wire plug going in to the compressor. When I hook those wires directly to the battery the A/C Stays on and gets VERY cold. However, after the engine is hot, if you unhook it and than reconnect it, it does NOT come back on. I discovered that the clutch was TRYING to pull back in but couldn't. What I discovered was the distance from the clutch plate to the pulley was about 1/4". The manual says it should be no more that 1/8" max. It seems that when the clutch is cold it's DC resistance is lower which makes it stronger than when it is hot. This is why it works when cold but as soon as it's hot and starts cycling it couldn't pull back in. I wasn't about to try to disassemble an 18 Y/O clutch so I noticed a square plate that the clutch disc sits on when it's off. I used a screwdriver and hammer and tapped the corners in to hold the disc closer to the pulley when it's off. Works great! WARNING: This is NOT how you are so posed to adjust the clutch. If you try this and damage your compressor you have been warned.
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