The problem sounds like your thermostat is faulty. These are a item that when they fail have to be replaced. The job of the thermostat is to seal the cooling system from the rest of the car when you first run the engine to bring the engine to working temperature quickly. Once the engine is warm the thermostat opens allowing the coolant to run through the radiator and keep the engine within the correct temperature range.
This is most likely your problem.
Posted on Monday 21st of May 2012Don't understand this? Ask a question