Thermostat — Audi A4

Category: Engine | Severity: medium | Cost: ₹3,000–₹10,000

What is Thermostat?

Thermostat regulates coolant flow based on engine temperature.

How Thermostat Works

Opens and closes valve to maintain optimal temperature.

Why is Thermostat Important?

Ensures engine operates at correct temperature.

Common Problems

Stuck open
Stuck closed

Symptoms

Overheating
Poor heating

Causes of Failure

Wear
Deposits

Impact on Car Performance

Improper temperature reduces efficiency.

DIY Fix Guide — Step by Step

Monitor engine temperature
Replace faulty thermostat

Maintenance Tips

Replace during cooling system service

Replacement Cost in India

Estimated range: ₹3,000 – ₹10,000

Where to Buy Online

When to Replace Thermostat

Replace if stuck or faulty.