How do you fill radiator fluid?

To properly fill radiator fluid, you need to add it to the coolant reservoir, not directly into the radiator. Here's a breakdown of the process:

Step-by-Step Guide to Filling Radiator Fluid

Locate the Coolant Reservoir: This is usually a translucent plastic container near the radiator or engine. It will have markings indicating "minimum" and "maximum" or "cold fill" levels.
Remove the Reservoir Cap: Carefully remove the cap from the coolant reservoir.
Check the Coolant Level: Observe the current coolant level in the reservoir. If it's below the "cold fill" line, you need to add more coolant.
Add Coolant:
- Type of Coolant: Use the correct type of coolant specified in your vehicle's owner's manual. This is crucial to prevent corrosion and damage to your cooling system.
- Mixture: You can use pre-diluted coolant, or a 50/50 mixture of concentrated coolant and distilled water. Using distilled water prevents mineral buildup in your cooling system. Do not use tap water.
- Filling: Slowly pour the coolant mixture into the reservoir until it reaches the "cold fill" line.
Replace the Cap: Once the coolant reaches the correct level, replace the reservoir cap and tighten it until you feel it click.

Safety First: Never open the radiator cap or coolant reservoir cap when the engine is hot. The cooling system is under pressure, and hot coolant can spray out, causing severe burns. Allow the engine to cool completely before attempting to add coolant.
Proper Coolant: Always use the correct type of coolant specified for your vehicle. Mixing different types of coolant can lead to corrosion and other cooling system problems.
Regular Checks: Check your coolant level periodically (e.g., weekly or monthly) and top it off as needed. This helps ensure your engine stays properly cooled and prevents overheating.

If you find that you are frequently needing to add coolant, it could indicate a leak in your cooling system. Common sources of leaks include:

Radiator: Look for signs of leakage around the radiator core or hose connections.
Hoses: Inspect the radiator hoses and heater hoses for cracks, bulges, or leaks.
Water Pump: A leaking water pump can often be identified by coolant drips near the pump pulley.
Head Gasket: A blown head gasket can cause coolant to leak into the engine cylinders or oil. This is a more serious issue that requires professional repair.

It is recommended to have a qualified mechanic inspect your cooling system if you suspect a leak.