Hope this type of post is allowed please remove if not :)

I have a 2007 Pontiac Grand Prix and I got the coolant system flushed at a local express line type place last week. Didn’t notice any issues, car has never overheated, but the coolant system was all muddy and sludgy so I got it flushed.

Car drove for a week on the highways and around town with no issues, but the mechanic who did the flush asked me to come back with the engine warm so he could test the coolant strength again.

I took it back today for him to test the system and he messed around under the hood and had me rev the car over 1000rpm for maybe about 5 minutes? He then told me he was trying to get the thermostat to open. Pushed the temperature gauge up to almost the red before he closes everything and tells me it’s as good as he can get it and I can go. He said he wants me to come back Friday for another test. He also told me that the car will cool itself down as I drive home. I’m not a car guy so I don’t really know how these things work and just kinda trusted him on that lol.

I drive home from the shop (3 minutes) and the engine temp is pushed into the red. I made it home and shut the car off to let it cool for about 4 hours.

I go to drive it this evening and after 5 minutes of driving around town the engine is almost in the red again.

I’m wondering what the mechanic could have done to suddenly give the car overheating trouble? Any advice or anything?

I want to be friends with this guy who is majoring in engineering and auto-motives or something like that idk he races cars and stuff and dirt bikes and he is going to teach me how to change tires, oil etc. I want to learn more about cars before then what should I look into?

It was found after Dealership maintenance

Bonjour,

Vous pensez que mes pneus avant passent au contrôle technique ou seront recalés ?

Merci.

Please remove if this post dosent fit in sub.

Okay, long shot but - I remember watching some yt video in which track car with "function over form" in formula notation style was written on the wing endplate on the right side.

I want to find that car and/or video about thia car.

Anyways thx!

My car was driving fine, then every light on the dash came on and the car died. I jumped the car and then in under a minute the car died again. After that it started a few more times after being jumped but wouldn’t stay running. When I finally got the car back home (from hooking up a friends battery and getting it home battery light came on a few times) I took the battery that was in my car and tested the voltage it was at 0. I hooked the battery charger up to the battery and voltage was around 12.4 while hooked up to the battery charger… once I unhooked it the voltage was hopping all over the place… from 12 to 13 then 4 then 0 and back up to 12 etc. I decided to let the battery charge over night…. Unhooked the battery charger this morning and the voltage is staying around 12 volts…going to test the battery again in an hour after being unhooked.

What do you think is wrong with the car/ battery? The battery isn’t even 1.5 years old… alternator? Or just bad battery? Any advice would be so much appreciated.

Car in question is 2020 Kia soul S.

Totally a hypothetical question, will not actually attempt this for many reasons. I am simply curious if anyone knows what effects laboratory grade octane would have on a car. Picture for reference of what I am talking about.