LEMON Manuals: Even more car manuals for everyone
Home >> Pontiac >> 2007 >> Grand Prix GXP >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> Thermostat Diagnosis (Slow to Heat)

Thermostat Diagnosis (Slow to Heat)

Thermostat Diagnosis (Slow to Heat)

Step Action Yes No
IMPORTANT: The J 24731  Tempil Stick is a pencil-like device that has a wax material containing certain chemicals which melt at a given temperature. See Special Tools . Use the temperature sticks to determine a thermostats operating temperature by rubbing 87°C (188°F) and 97°C (206°F) sticks on the coolant outlet. The marks made by the sticks should melt when coolant temperatures reach 87°C (188°F) and 97°C (206°F), respectively. These temperatures are the normal operating range of the thermostat.
1
  1. Remove the radiator cap. Refer to Draining and Filling Cooling System (L26, L32 GE 47716 Fill)  or Draining and Filling Cooling System (L26, L32 Static Fill)  or Draining and Filling Cooling System (LS4 GE 47716 Fill)  or Draining and Filling Cooling System (LS4 Static Fill) .
  2. Rub a 87°C (188°F) J 24731  on the coolant outlet. See Special Tools .
  3. Warm up the engine at fast idle.
  4. Check for coolant flow before the mark begins to melt.
Is there coolant flow before the mark melts?		 Go to Step 3  Go to Step 2 
2 The problem is caused from something other than the thermostat. Refer to Engine Fails To Reach Normal Operating Temperature .
Does the engine warm up properly?		 System OK -
3
  1. Replace the thermostat. Refer to Thermostat Replacement (LS4)  or Thermostat Replacement (L26/L32) .
  2. Check the system.
Does the engine fail to reach normal operating temperature?		 - System OK
scientia non olet · About LEMON Manuals