My jetta recently started shifting up (I assume) or goes limp (no power) when the temp sensor reads 90 at this time the speedo also goes wild and jumps around. When I crank the heat the problem goes away as the temp sensor reading drops from 90.
No issues when cold or under 90 degrees. Need help desperately as I drive 160k a day for work and can't afford a new car.

 

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing.


Post moved to correct section.

 

There's no check engine light and the guy I had try his scanner came up with nothing? I know it's an odd problem.