Posted by Goose on August 29, 2017 at 19:56:42 from (70.198.56.253):
A couple of weeks ago, I posted a thread about the rear A/C unit in our Chrysler T&C intermittently sounding like a jackhammer, machine gun, motorcycle, take your pick.
Our local NAPA shop was stumped, they'd never heard it before, but they found the system was a bit low on refrigerant, so they topped it off and the noise went away.
For three days. Then came back with a vengeance. I've had my fingers in vehicles since I was 12, and I've never heard a sound like that in a vehicle. Nor had anyone else I talked to. Then I ran into a local former Chrysler dealer I've known for years. (Former, because he was a small town dealer who lost his franchise in the shakeup several years ago. He stayed open as an independent used car dealer and repair shop). I mentioned the noise to him, and he said, "I know exactly what you're talking about. I've heard it before. It's the rear expansion valve. We had another one once that made the same noise and drove us nuts for a month".
So, since he told me what the noise was I felt obligated to let them fix it. They replaced the rear expansion valve and, sure enough, no more noise.
Now here's where it gets interesting. Last May 2, the NAPA shop replaced the rear evap core because it was leaking. Yesterday I was at the parts counter at NAPA buying a set of spark plugs for my pickup and mentioned the outcome to the Shop Manager. He said they'd replaced the rear expansion valve along with the evap core, and told me if I could get the old part back from the Chrysler shop he'd turn it in on warranty and maybe get some money back.
So--I got the old part back and from appearance you'd have a hard time convincing me it was new in May. In fact, it had enough long term crud on it to be the original one in the vehicle. I dug out my bill, and they did charge me for the expansion valve among other parts in May. I gave it to NAPA without making any comments, but it will be interesting if they try to turn it in on warranty. Particularly since the part number stamped on it doesn't match the current NAPA number for the same part.
I'm not making any accusations yet, I'll wait for the outcome. And for the record, several of the guys at the NAPA shop have worked for me in different situations, including the one who did the A/C work.
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