I have an "emergency" rod/reel setup in the trunk of my car for those Emergency Bassin' moments.  In the heat of the summer am I ruining the braid that I have on?  So far I see no problems but thought I would ask before I land into a lunker and break-off.

I don't think it will bother the braid.  Pack your leader line in with your lunch and take it with you inside the workplace! 

and if your leader is small enough, you can floss in a pinch!!!

 

I cant see heat bothering braid much unless it has all the super duper resins, polymers and magic dust flouro has....

Braid is made from very high temperature materials, no issues with car trunk environment. Mono is Nylon and about 105 degrees F is about the limit, FC is fluorocarbon, also high temperature material.

Tom

I probably will not affect the braid. However, I would be concerned about the reel it's on. Excessive heat can degrade some lubricants and I'd be especially concerned about drag washers drying out, as oil does dry up.