i have a 2001 gti and the engine doesnt get up to temp..any help guys???

 

You mean the gauge doesn't go up to the normal position?

Well I would remove and test the thermostat first. Just put it in a sause pan of water and bring it to the boil slowly with a thermometer in the water. Notice at what temperature the stat starts to open. The opening temperature will be marked on the stat. If you haven't got a thermometer then just put a new stat in they don't cost much then you know its new.

If it still doesn't show the correct temperature on the gauge then it sounds like the temp sensor is faulty, again they aren't expensive.