I have a very strange problem that I hope someone can help me with. My 99 5.2L SLT Durango has started making a strange sound that I can only describe as a badly out of tune horn like some sort of resonance going through a hollow pipe. It lasts for a second or two and can be really loud. I can actually feel it through the gas or brake pedal. At first when my wife reported it (it's her car) I didn't believe her. She told me it happens when she slowed down to a stop or made a left turn. This past weekend we were driving into NYC from the Boston area and sure enough I got into the left lane to get on the highway and as soon as I came to a stop this really loud metallic horn sounding noise reverberated through the car. Scared the daylights out of me.
Well I got on the highway and didn't hear it for a good portion of the ride, was doing around 65-70mph. However, I started noticing that whenever I had to slow down I would hear it, although not as loud as when I was at a stop. So I driving along, lot of time to think about the causes and where it was coming from based on my wife's experiences and decided to shut off the AC and heater. Didn't hear it for the rest of the trip. Kept the AC/heater off for the whole trip back (250 miles) and didn't hear it once. I'm thinking it's comeing from the piping in AC system, maybe some valve sticking causing it but why only when I slow down or stop??
I am going to try to test this theory and reproduce it in my driveway this weekend but would love to know if anyone has any ideas.
10-23-2012, 07:55 AM
