By the time this message hits the servers, you'll likely have 4 or 5 similar responses. Let me guess, you have an automatic, right? It's called "heat soak" on the starter and a new one will make the problem go away. Pretty common on the A2 auto tranny. Good luck.
TOE
About 6 months ago I bought a 92 Jetta.
> During the winter I didn't have much problems (other then a blinking
> temperature light, which after about 3 visits to the mechanics was finally > fixed).
>
> Now that it's hot out, I have been stranded about 4 or 5 times. The car
> doesn't seem to get overly hot (the temperature gage goes only slightly
> beyond the 2nd marker) but after a long hot drive (25 minutes at over 80
> kph) once I shut the car off, it won't start up again for at least 40
> minutes. The engine does not turn over. It seems almost like some sort of
> safety design.
>
> I remember a friend's jetta the fan would run for a long time after he drove
> it, but it does not do that in mine.
>
> My mechanic can't find anything and it's hard to diagnose as it only happens
> after long drives.