Having problems with your 2004 Volkswagen Jetta ?
Over heating and hard to start - 2004 Volkswagen Jetta
Thermostat needs to be replaced for overheat. If it didn't open, then coolant becomes stagnant then causes engine overheated. Once it was overheated, it destroyed the coolant temp sensor. The signal from this sensor will feed in your ECU to tell it to open your cold start valve to spray extra fuel into engine to assist the start. Replace the Coolant temp sensor for your start problem.
Repair Help & Product Troubleshooting for 2004 Volkswagen Jetta
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.