Golf TD

Hello. I have a golf TD, and the problem I have with it is that it starts very well, and when it is heated there is no way to start it.
In cold the light of the heater, they light themselves as normal, but when you want to start it, you want to start it,
the light of the heater no longer turns on and does not start.
If you expect a while that cools, you will bue teach the light and start without problems.
Someone can tell me that it can happen to you. Grace of all ways, and I hope to repair.