Question about 2003 Dodge Caravan

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High-pitched whistle after running A/C for a time and hot out

On my 2003 Crand Caravan Sport, we get a high-pitched whistling noise coming from the mid- to rear of the minivan when running the A/C for a while and it is very hot out. This does not occur when we first start, but only after we have been travelling for a while (30-45 min or more). We have the middle seat A/C on this minivan.

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Have same problem with same vehicle. I'll post here if I find out what it is, will probably investigate myself before taking to a shop.

Posted on Jul 10, 2010

  • PeteF22 Apr 21, 2011

    Ditto. I have had the issue with my 2003 Caravan for a few years. It only happens when it is hot outside 70/80 degrees or higher. I have noticed that I do not need the AC or air on for it to happen. On really hot days it happens within seconds of starting up the car. Only happens when running. My thoughts are that it must be something that stays relatively cool so core engine and exhaust would be ruled out. Perhaps belts are heating up and causing a strange condition that creates the sound. Not sure, but hope someone figures it out soon as summer is right around the corner

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