Dayco Overflow Tank — DOT0005
The Dayco DOT0005 is a coolant overflow (recovery) tank for compatible Holden applications, used to recover coolant that escapes the cooling system past the pressure cap as pressure and temperature rise, then siphon it back into the radiator as the engine cools.
- Made to OE specifications and designed to be make/model specific
- Tanks commonly need replacement once they become discoloured, brittle, contaminated with sludge, or cracked
- Durable construction to withstand ongoing pressure and temperature changes
- Helps prevent coolant loss and overheating by maintaining correct recovery of escaped coolant
- Easy to install as a direct replacement
- Backed by a 2-year/40,000km warranty
Note: this is an overflow or recovery tank, which sits downstream of the pressure cap — it is not a pressurised expansion tank that carries the cap itself. Check which type your vehicle uses and confirm the part number against your make and model before ordering.
| SKU | DOT0005 |
| Model # | DOT0005 |
| Barcode # | 9325361322686 |
| Brand | Dayco |
| Placement On Vehicle | Engine |
| Warranty | 2 Years/40,000km |
| Type | Coolant Overflow Reservoir |
| Manufacturer Part Number | DOT0005 |
| Position On Vehicle | Engine |
| Contains Liquid | No |
| Features | 100% Leak tested |

- One of the largest Automotive companies in Australia.
- Dayco products are of the highest quality with OE spec parts
- Dayco supply a variety of parts to the aftermarket industry including belts, pulleys, thermostats, tensioners among others.
- See our other items for more Dayco products
Packaging: Manufacturers periodically update their packaging and labelling. You may receive the current or a previous design — the product, formulation and part number are unchanged.
Fitment (vehicle-specific products): Vehicle fitment is based on manufacturer and supplier catalogue data and is kept as accurate as possible, but vehicle catalogues are not perfect. Some models had more than one part fitted depending on build date, engine, or component size/variant, and parts on older vehicles may have been replaced with non-original or different-style components.
Before you buy, compare the product images with the part currently fitted to your vehicle — check shape, size, connectors and mounting points. If the part on your vehicle looks different, please contact us before purchasing. It is the buyer's responsibility to confirm the part suits their vehicle before purchasing.
Not sure? Message us with your vehicle's registration number and state (preferred), or full VIN/build details, and we'll do our best to confirm fitment before you buy.
Parts returned because they do not suit the vehicle, where the listing matches the manufacturer's catalogue, are treated as a change of mind and must be unused, uninstalled and in original packaging. Nothing in this notice affects your rights under the Australian Consumer Law.