So this just started today. I noticed as I was driving my girlfriend to work that my temperature gauge starting getting really hot. Then I started hearing knocking from underneath my car. After dropping her off I rolled my window down and realized that when I accelerated, I’d hear a rattling sound underneath my car, but when I let off of the gas, it went away. The more I accelerated, the louder it got. Then I realized my temperature gauge wasn’t at hot anymore, it was now at cold. Also my heat didn’t work the entire ride there or back.
To add to this, the last week or two my car has been having troubles starting up which I assumed was the battery from the cold. Yesterday morning I had to have it jumped, and then again when I got off of work.
I don’t know what it could be. Google said maybe a heat shield. But I am wondering if anybody can give me some ideas. I have to work tonight and want to make sure my car is safe to drive.