How do you trip the cylinoid in the starter on a 1988 vw cabriolet Once the car has been driven half hour then turned off the starter will not do anything Turn the key and nothing Help please?

you dont ... you get a new starter motor because your cylinoid is busted ..... == A better answer is you let it sit for half an hour or more while the starter cools down. It will start again when the engine cools down. The starter heats up from starting, the engine conducting heat, and from being next to the exhaust manifold. Cheap starter rebuilders do not leave enough room for thermal expansion. You have a rebuilt starter. ALWAYS insist on a BOSCH starter! You do need a new starter. I went through 2 starters before I found this out. Automatic transmission starters suffer from heat-soak, especially as they age. VW knew about this, issued a technical bulletin about it and installed hot-start relay kits on affected cars. You can easily do it yourself: http://forums.vwvortex.com/zerothread?id=2593146 ; be sure the heat-shield is in-place as well.