How to Change Yamaha Grizzly 700 Coolant

Coolant turns acidic over time, and if you don't change it periodically, it starts to corrode the internal parts within the Yamaha ATV's engine, not to mention the radiator and coolant hoses. 

Yamaha recommends replacing the coolant in a Grizzly 700 at least once every two years. Watch the video above or follow the steps below to do a coolant flush and replacement in a Yamaha Grizzly YFM700 ATV.

See the parts diagrams:

2007 Yamaha Grizzly YFM700 coolant flush supplies

Tools and Supplies - Yamaha Grizzly Coolant Flush

Yamaha engine coolant

Buy oil drain pan

Yamaha Grizzly YFM700 Cooling System Drain

Step 1. Remove the left footwell and the left side cover, the front carrier and the front cover beneath it to access and remove the radiator cap.  

2007 Yamaha Grizzly YFM700 ATV coolant drain

Yamaha Grizzly YFM700 ATV coolant drain

2007 Yamaha Grizzly YFM700 coolant drain

Yamaha Grizzly YFM700 ATV coolant drain

Step 2. Have a drain pan ready and remove the drain bolt at the base of the water pump housing, which is located just below the left crankcase cover. Drain the cooling system completely. 

2007 Yamaha Grizzly 700 ATV coolant drain

PRO TIP: The pressure of the coolant can make it squirt out at first, so make sure to position the drain pan accordingly.

2007 Yamaha Grizzly 700 coolant drain

Inspect the old coolant for contaminants, as you'll need to flush the cooling system before adding in new coolant. If the old coolant is in relatively good condition, skip ahead to the last section (coolant change) of this guide.

Yamaha Grizzly YFM700 Cooling System Flush

Step 1. Locate the coolant reservoir behind the left front fender, then disconnect the hose from the base of the coolant reservoir and drain out the reservoir. Reconnect the reservoir hose.

2007 Yamaha Grizzly YFM700 ATV cooling system flush

Yamaha Grizzly YFM700 ATV cooling system flush

2007 Yamaha Grizzly YFM700 cooling system flush

Step 2. Fill the cooling system with water, and then drain it out to remove as much debris and any remaining coolant as possible.

Yamaha Grizzly YFM700 cooling system flush

NOTE: Add fluid to the radiator and continue filling until the radiator is full. Don't fill the cooling system through the reservoir.

Yamaha Grizzly cooling system flush

Step 3. Fill the cooling system with the instructed concentration of coolant flush and replace the radiator cap.

Yamaha ATV cooling system flush

Step 4. Remove the right side cover and the ducting beneath it to access the thermostat.

2007 Yamaha Grizzly 700 ATV cooling system flush

2007 Yamaha Grizzly 700 cooling system flush

Yamaha Grizzly 700 ATV cooling system flush

Step 5. Loosen the thermostat bleed bolt to remove any air from the system, then tighten the bleed bolt.

Yamaha Grizzly 700 cooling system flush

Step 6. Loosen the water pump bleed bolt to remove any air from the system, then tighten the bleed bolt. The bleed bolt is located above the drain bolt on the water pump housing.

2007 Yamaha YFM700 cooling system flush

Step 7. Run the engine until it reaches normal operating temperature, then shut it off and let it cool.

2007 Yamaha YFM700 ATV cooling system flush

Step 8. Drain the cooling system to remove the coolant flush, then refill the cooling system with water, replace the radiator cap and run the motor up to operating temperature.

Yamaha YFM700 ATV cooling system flush

2007 Yamaha Grizzly 700 ATV coolant flush

Step 9. Let the motor cool, and then drain the cooling system again to rinse away any last traces of coolant flush.

2007 Yamaha Grizzly 700 coolant flush

Step 10. Inspect the water that drains from the cooling system. The water should clear and free of contaminants. If the water is still heavily discolored or contains debris, flush the cooling system again. (See coolant flush coloration progression (left to right) and brand new coolant in the image below). 

Yamaha Grizzly 700 ATV coolant flush

How to Change Yamaha Grizzly YFM700 Coolant

Step 1. Fill the cooling system with Yamacool engine coolant.

2007 Yamaha Grizzly 700 ATV coolant change

Step 2. Loosen the water pump bleed bolt to remove any air from the system.

Yamaha Grizzly 700 ATV coolant change

Step 3. Loosen the thermostat bleed bolt to remove any air from the system.

2007 Yamaha Grizzly YFM700 ATV coolant change

Step 4. Run the motor for a few seconds, then top off the cooling system with engine coolant and replace the radiator cap.

Yamaha Grizzly coolant change

Yamaha Grizzly YFM700 ATV coolant change

Step 5. Run the motor until it reaches normal operating temperature, then shut it off and let it cool.

Yamaha Grizzly YFM700 ATV coolant change

Step 6. Top off the cooling system with engine coolant and replace the radiator cap.

2007 Yamaha Grizzly YFM700 coolant change

Step 7. Refill the reservoir with engine coolant to somewhere between the Low and Full markings. Reinstall the ducting, the covers and the footwell and you're done.

Yamaha Grizzly ATV coolant change

Ready to change out the oil in your Yamaha ATV next?  Watch the video below to learn how to change Yamaha Grizzly 700 oil.