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Details
| Specification | Value |
|---|---|
| Brand | 3RG |
| Opening Pressure [bar] | 1.6 bar |
OE numbers (4)
Search by this OE number to find compatible parts
- AUDI / CUPRA / SEAT / SKODA / VW—2Q0121321
- AUDI / CUPRA / SEAT / SKODA / VW—2Q0121321A
- AUDI / SEAT / SKODA / VW—3C0121321
- AUDI / SEAT / SKODA / VW—5Q0121321
Where this part fits
Original-fit position for OE 5Q0121321. The red ring marks where this part installs on the vehicle.
About this product
Sourced from 3RG, this cap coolant tank (65704) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Technical specifications — Opening Pressure [bar]: Steel, Plastic bar — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Verified to fit AUDI, CUPRA, SEAT, SKODA and 1 other makes models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 0011025918, 053027007, 1001210070, 103522 and 46 more. Matching these numbers confirms a like-for-like replacement with no loss of function. 3RG is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched with tracked delivery and a 14-day money-back guarantee with hassle-free returns.
Suitable cars
Equivalent products (47)
Show all 47 OE numbers
Cap Coolant Tank 3RG 65704 — compatible car models
| Car models | AUDI: A1 (8X1, 8XK), A1 Allstreet (GBH), A1 City Carver (GBH), A1 Sportback (8XA, 8XF), A1 Sportback (GBA), A3 (8P1), A3 (8V1, 8VK), A3 Convertible (8V7, 8VE), A3 Limousine (8VS, 8VM), A3 Limousine (8YS, 8YM) (+16 more); CUPRA: ATECA (KH7, KHP, KBP), BORN (K11), FORMENTOR (KM7, KMP), LEON (KL1, KU1, KUG) |
|---|---|
| Engines | 1.8 TFSI; 25 TFSI; 2.0 TDI; 1.0 TFSI; 1.4 TFSI; 30 TDI; 30 g-tron; 50 TFSI e quattro; 50 TFSi e quattro; 35 TDI; 35; 40; 3.0 TDI quattro; 2.0 TSI 4Drive; 45 (+2 more) |
| Year of manufacture | 2003-2022 |
| Manufacturer article number (MPN) | 65704 |
| OE part numbers | 2Q0121321, 2Q0121321A, 3C0121321, 5Q0121321 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
3RG 65704 . Opening Pressure [bar]: 1,6 bar
- 1x Cap Coolant Tank
Shipping, returns, warranty
Free UK delivery on orders over £50.00. Tracked standard shipping.
- Standard delivery: 4–8 business days
- Order before 5pm — ships the next working day
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Cap Coolant Tank compatible with my car?
This Cap Coolant Tank fits AUDI, CUPRA, SEAT, SKODA, VW vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this 3RG Cap Coolant Tank have?
This 3RG Cap Coolant Tank has the following specifications: Opening Pressure [bar]: 1,6 bar. Check the full specifications table above for complete details.
What OE part numbers does this Cap Coolant Tank replace?
This Cap Coolant Tank replaces OE part numbers: 2Q0121321, 2Q0121321A, 3C0121321, 5Q0121321. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Cap Coolant Tank cost?
This 3RG Cap Coolant Tank is available for £8.99. Cap Coolant Tank prices vary depending on brand, specifications, and vehicle compatibility. 3RG parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Cap Coolant Tank?
Regular inspection of your Cap Coolant Tank is recommended as part of routine vehicle maintenance. Watch for changes in performance, unusual noises, or visual signs of wear. Consult your vehicle's owner manual for manufacturer-recommended replacement intervals specific to your make and model.
What tools do I need to replace a Cap Coolant Tank?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Cap Coolant Tank fitted by a professional mechanic.
Can I use this part as a replacement for OE 2Q0121321?
Yes, this 3RG Cap Coolant Tank is a direct replacement for OE part number 2Q0121321. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
