Expansion Tank for Opel Astra H / GTC / TwinTop (2004–2011)

This coolant expansion tank (reservoir) is designed for the Opel Astra H range, helping maintain correct cooling system pressure and coolant volume during normal temperature changes. It is a direct replacement for the original tank when the existing unit is cracked, leaking, or the mounting points have weakened over time.

Vehicle Compatibility

• Opel Astra H (A04) 2004–2011 — 1.4 (Z14XEP) 66 kW
• Opel Astra H (A04) 2004–2011 — 1.6 (A16XER / Z16XER) 85 kW
• Opel Astra H (A04) 2004–2011 — 1.6 (Z16XE1 / Z16XEP) 77 kW
• Opel Astra H (A04) 2004–2011 — 1.8 (A18XER / Z18XER) 103 kW
• Opel Astra H (A04) 2004–2011 — 1.8 (Z18XE) 92 kW
• Opel Astra H (A04) 2004–2011 — 1.9 CDTI 16V (Z19DTJ) 88 kW
• Opel Astra H GTC (A04) 2005–2010 — 1.8 (Z18XER) 103 kW
• Opel Astra H GTC (A04) 2005–2010 — 1.9 CDTi (Z19DTH) 110 kW
• Opel Astra H GTC (A04) 2005–2010 — 2.0 Turbo (Z20LER) 147 kW
• Opel Astra H GTC (A04) 2005–2010 — 2.0 OPC (Z20LEH) 177 kW
• Opel Astra H TwinTop (A04) 2007–2009 — 1.8 (A18XER / Z18XER) 103 kW
• Opel Astra H TwinTop (A04) 2007–2009 — 2.0 Turbo (Z20LER) 147 kW

OE Reference Numbers

• Opel: 13 04 241
• Vauxhall: 93179469

Specifications

• Product Type: Coolant Expansion Tank / Reservoir
• SKU: MAP-100634
• Fitment Notes: Confirm hose routing, cap type, and sensor/return port layout match your existing tank before fitment.

Common Signs of a Failing Expansion Tank

• Visible coolant leaks or staining around the tank seams
• Cracks near hose connections or mounting points
• Coolant smell in the engine bay after driving
• Low coolant warnings despite no radiator leaks found

Nationwide delivery is available in South Africa. If you are unsure about fitment, share your VIN or vehicle details and we’ll help confirm compatibility before you install the part.