my BMW X5 has a burning smell but no visible leaks

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Engine Oil

• Sub-steps:
  1. Remove the oil dipstick and check oil level and quality.
  2. If oil is low or contaminated, drain the old oil using an oil drain pan.
     • Tools Required: Oil drain pan, socket set.
  3. Replace with fresh, manufacturer-recommended oil (5W-30 or as specified).
     • Torque Value: Ensure oil drain plug is torqued to the manufacturer’s specifications (typically around 20 Nm).
  4. Replace the oil filter if necessary.

3. Check and Replace Coolant

• Sub-steps:
  1. Locate the coolant reservoir and check the level; add coolant if low.
  2. If coolant appears contaminated, drain and flush the cooling system.
     • Tools Required: Hose, coolant flush kit, coolant.
  3. Refill with a 50/50 mixture of BMW-approved coolant and distilled water.

4. Inspect and Replace Serpentine Belt

• Sub-steps:
  1. Visually inspect the serpentine belt for cracks or wear.
  2. If damaged, remove the belt by releasing tension from the tensioner pulley.
     • Tools Required: Serpentine belt tool.
  3. Install the new belt according to the routing diagram located under the hood.

5. Examine and Repair Wiring

• Sub-steps:
  1. Inspect wiring harnesses for any signs of melting or damage.
  2. Repair or replace any damaged wiring connections.
     • Safety Warning: Ensure the battery is disconnected to avoid electrical shock.