Audi A4 Overheating — Coolant Loss Through Expansion Tank Crack
Audi
A4
2001
All B6/B7
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
🚫 Do NOT Drive
Safety Impact
Direct safety risk — affects safe operation of the vehicle
Urgency Level
🟡 Monitor Closely
Audi A4 B6/B7 running hot with gradual coolant loss points to a cracked plastic expansion tank — a very common failure on these models. The tank develops hairline cracks difficult to see without pressure testing. Tank replacement costs £60-150.
Repair / Solution
No confirmed fixes yet. Share yours below.
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Audi A4 2001 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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