Self FixerCom.DE

Thermostat removing2004 650 Twin Arctic Cat ATV

1. Remove the front rack and fenders; then remove the center splash shield.
2. Drain the cooling system down approximately 1 quart.
3. Remove the cap screws securing the thermostat housing to the mounting bracket; then remove the remaining two cap screws and separate the housing and cover.
4. Remove the thermostat and account for the seal.

Inspecting

NOTE: Whenever a part is worn excessively, cracked, or damaged in any way, replacement is necessary.

1. Inspect the thermostat for corrosion, wear, or spring damage.
2. Using the following procedure, inspect the thermostat for proper operation.
   
   A. Suspend the thermostat in a container filled with water.
   B. Heat the water and monitor the temperature with a thermometer.
   C.The thermostat should start to open at 69.5-72.5^oC (157-162^oF).
   D. If the thermostat does not open, it must be replaced.
3. Inspect all coolant hoses, connections, and clamps for deterioration, cracks, and wear.

NOTE: All coolant hoses and clamps should be replaced every four years or 4000 miles.

Installing

1. Place the thermostat and seal into the thermostat housing; then finger-tighten the thermostat housing to the mounting bracket with the two cap screws.
2. Install the remaining two cap screws; then tighten the four cap screws to 0.9 kg-m (78 in.-lb).
3. Fill the cooling system (2.7 L or 2.8 U.S. qt) with antifreeze. Check for leakage.
4. Install the center splash shield; then install the fenders and front rack.

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Updated on: Friday, November 20, 2020