I have a weird sound that seems to only appear when it’s between 30 and 50 degrees outside. It varies in quality from a slight “chirp” “chirp” “chirp” sound that increases in frequency from about 2K onward, to an angry sounding, loud - even maybe metallic tapping sound. I figured it was something pretty substantial, so naturally I put it off.
Here’s where the weird part comes in though. I did not notice it when I bought the car last summer, and I drove it all over the place - on the highways, in the mountains, on roads, off roads, everywhere, and didn’t hear the sound when it was hot outside. I only heard it a few time on chilly mornings, though it’d usually go away after a few minutes.
It sort of kept getting worse and worse over fall. I then discovered that it didn’t ever happen while the car was in park at all. The sound only happened drive and while accelerating. One day it was so bad I decided that I just couldn’t keep on putting it off, and decided to take it into the mechanic. On my way over though, naturally it didn’t make the sound anymore and just ended up cancelling since I didn’t see any point in paying for a “could not replicate”, I’d figure I’d just reschedule in a day or two when the sound came back.
In the meantime, the weather started to get very cold (well under 20 degrees) and stayed that way for a few weeks. Now, the sound vanished entirely! After the cold snap, when the temperature climbed back up around 30 or so, the sound returned.
The truck seems to run smoother in very cold weather (weird, I know).
I am wondering what heck this might be? I’ve looked everywhere, but my search results are so bogged down with noises while cold I can’t seem to find anything about noises only when slightly chilly.