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Discussion Starter #1
Well last week I traded my 03 6.0 in one a 08 6.4. Gonna get tuned when I have the spare cash. Well well the ac or heater.(does with both on) it makes a thumping or popping noise from right side in the front. Thought maybe vacuum pump but that is on the other side. No noise when heat or cool is off. What is going on? Compressor cycling? And if so is that Normal? Also when I was on a steep grade and disengaging 4 low in made a terrible sound from under truck twice and would stop once I put in park. Flat ground and slight grade no noise . Any ideas on these noises? Thanks

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Discussion Starter #2
????
 

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Discussion Starter #3
Wow.
 

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Discussion Starter #4
Caused by low refrigerant.
 
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