Originally Posted by
Trevhib
1. Disconnect the hose that feeds the coolant into the turbo
2. Disconnect the hose that takes the coolant out of the turbo
3. Join the two disconnected hoses together.
Effectively bypassing the turbo. The turbo will run fine for a short time without coolant going through it.
If you see no white smoke, you know that coolant was leaking into to the turbo past the seals (and so need to get it rebuilt). If you still get white smoke, you know this isn't the problem and you can reconnect the coolant hoses to the turbo and keep looking for the problem.