How to Replace Radiator Coolant Overflow Bottle 99-05 Volkswagen Jetta or Golf
Difficulty: Intermediate · About 30 min · Volkswagen Jetta
Replace the coolant expansion reservoir on a 1999–2005 Volkswagen Jetta or Golf, reconnecting its hoses and level-sensor plug with the engine fully cold.
Tools you will need
- Phillips screwdriver
- Pliers
- Funnel
Parts and supplies
- Coolant expansion reservoir
- Vehicle-specified coolant
Steps
Prepare the cooling system
Park on level ground and wait until the engine is completely cold. Place a catch pan below the reservoir and never remove the cap while the system is hot or pressurized.
Disconnect the reservoir
Unplug the level-sensor connector and move the hose clamps back from the fittings. Remove the upper hose and reservoir screws, then lift the bottle clear and disconnect the lower hose.
Install the replacement bottle
Connect the lower hose and secure its clamp, then align the bottle peg with its locating hole. Reconnect the upper hose and sensor plug and install the retaining screws.
Refill and inspect
Add the specified coolant to the correct fill mark and secure the cap. Follow the vehicle’s bleed procedure, then inspect the hoses and bottle for leaks after the engine cools fully.
Check your vehicle’s repair manual for exact specifications and fit.