What to know
- Replacing the coolant reservoir in a BMW E46 is a straightforward task that can be completed in less than an hour.
- Slide the overflow hose onto the nipple on the bottom of the reservoir and tighten the hose clamp using a screwdriver.
- Replacing the coolant reservoir in a BMW E46 is a relatively simple task that can be completed in under an hour.
Replacing the coolant reservoir in a BMW E46 is a straightforward task that can be completed in less than an hour. This guide will provide step-by-step instructions on how to change coolant reservoir bmw e46, ensuring your vehicle operates at optimal performance.
Tools and Materials
- New coolant reservoir
- BMW coolant
- Distilled water
- 10mm socket and wrench
- Phillips head screwdriver
- Funnel
- Rags
Safety Precautions
- Allow the engine to cool completely before performing any work.
- Wear gloves and safety glasses to protect yourself from hot coolant.
- Dispose of old coolant properly according to local regulations.
Step-by-Step Instructions
1. Locate the Coolant Reservoir
The coolant reservoir is located on the passenger side of the engine bay, near the firewall. It is a translucent plastic container with a black cap.
2. Remove the Reservoir Cap
Use a rag to protect your hand from heat and carefully unscrew the black cap on the reservoir. Be cautious as some pressure may be released.
3. Disconnect the Overflow Hose
Locate the small hose connected to the bottom of the reservoir. Use a screwdriver to loosen the hose clamp and disconnect the hose.
4. Unbolt the Reservoir
Use a 10mm socket and wrench to unbolt the two bolts securing the reservoir to the bracket.
5. Remove the Reservoir
Carefully lift the reservoir out of the bracket. Some residual coolant may spill out, so use a rag to clean up any spills.
6. Install the New Reservoir
Place the new reservoir into the bracket and align the bolt holes. Tighten the bolts using the 10mm socket and wrench.
7. Reconnect the Overflow Hose
Slide the overflow hose onto the nipple on the bottom of the reservoir and tighten the hose clamp using a screwdriver.
8. Fill the Reservoir
Use a funnel to fill the reservoir with a 50/50 mixture of BMW coolant and distilled water. Fill the reservoir to the “MAX” mark.
9. Replace the Reservoir Cap
Screw the black cap back onto the reservoir hand-tight.
Bleeding the Cooling System
Once the new reservoir is installed, it is essential to bleed the cooling system to remove any trapped air.
- Start the engine and let it idle.
- Turn on the heater to the highest setting.
- Open and close the bleeder screw located on the top of the radiator hose until coolant flows out.
- Close the bleeder screw and let the engine continue to idle until the thermostat opens and the radiator fan turns on.
- Recheck the coolant level in the reservoir and top up if necessary.
Recommendations
Replacing the coolant reservoir in a BMW E46 is a relatively simple task that can be completed in under an hour. By following these instructions, you can ensure your vehicle’s cooling system operates efficiently and effectively, preventing overheating and potential engine damage.
Information You Need to Know
1. What causes a coolant reservoir to fail?
A coolant reservoir can fail due to age, exposure to heat, or physical damage.
2. How often should I replace my coolant reservoir?
The recommended replacement interval for a coolant reservoir is every 5 years or 100,000 miles, whichever comes first.
3. Can I use any type of coolant in my BMW E46?
No, it is important to use only BMW-approved coolant, as other coolants may contain additives that can damage the cooling system.
