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Is there relation between stalling engine and blue coolant light My 2001 vw beetle drives rough even at low speeds when the is on. Once off it fine?

It's unlikely that a blue coolant light directly causes your VW Beetle to stall and run rough, but it definitely indicates a serious problem. Here's why:

Blue Coolant Light:

* Low Coolant: A blue coolant light usually means your coolant level is low. This could be due to a leak, a cracked radiator, or a faulty coolant reservoir.

* Overheating: A low coolant level can lead to overheating, which can cause serious engine damage.

Rough Running and Stalling:

* Overheating: Overheating can cause engine misfires and stalling.

* Air in the Cooling System: Air trapped in the cooling system can cause problems with coolant flow, potentially leading to overheating and rough running.

* Other Issues: There are many other potential causes of rough running and stalling, such as:

* Faulty spark plugs or wires

* Fuel delivery problems (fuel pump, injectors)

* Air intake leaks

* Faulty sensors

What to Do:

1. Check Coolant Level: Immediately add coolant if the level is low. Be sure to use the correct type of coolant for your VW Beetle.

2. Inspect for Leaks: Look for any visible coolant leaks under the hood and around the engine.

3. Address the Overheating: If the engine is overheating, stop driving immediately. Let it cool down before trying to restart it.

4. Diagnostic Scan: Take your VW Beetle to a mechanic for a diagnostic scan. This will help identify the root cause of the rough running and stalling.

Important Note: Driving with a low coolant level or an overheating engine can cause serious engine damage. It's crucial to address the issue promptly.