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ctrlz · 01-26-2022, 10:23 AM

Hope this helps:
https://www.camaro6.com/forums/showthread.php?t=549876

Below is from the repair manual. Apparently all three engines use the same thermostat. The description says it starts to open at 180, while the diagnosis guide says it starts at 194. I can't find the spec for the temp.

Mechanical Thermostat

The mechanical thermostat is positioned between the engine and the radiator. Its purpose is to control
the flow of coolant to the radiator. The thermostat will not allow coolant flow through the radiator when
cold, coolant flow occurs when the engine has warmed up. Once the engine reaches its operating
temperature, generally about 95°C (203°F), the thermostat opens. This actuation of the thermostat starts
to occur at 82°C (180°F), when the heated wax contained within a cylinder melts and rapidly expands,
pushing the rod and valve assembly out of the cylinder, opening the valve. The temperature dependent
actuation of the thermostat allows the engine to warm up as quickly as possible, the thermostat reduces
engine wear, deposits and emissions. The open thermostat now allows the coolant to flow through the
engine cooling circuit to maintain optimal operation temperatures, which is achieved by directing the hot

coolant through the radiator for cooling and recirculation

DIAGNOSTIC INFORMATION AND PROCEDURES > THERMOSTAT DIAGNOSIS

Tools Required

J 24731

188 Tempilstick

J 24731

206 Tempilstick

The coolant thermostat can be tested using a temperature (tempil) stick. The temperature stick is a
pencil-like device which has a wax material containing certain chemicals that melt at a given
temperature. Temperature sticks can be used to determine a thermostat's operating range by rubbing 87°C (188°F) and 97°C (206°F) sticks on the outlet coolant pipe.

1. Use a tempilstick in order to find the opening and the closing temperatures of the thermostat.

1.

J 24731 188 tempilstick melts at 87°C (188°F). The thermostat should begin to open at 90°C (194°F).
2. J 24731 206 tempilstick melts at 97°C (206°F). The thermostat should be fully open at
107°C (225°F).

2. Replace the thermostat if it does not operate properly between this temperature range.

01-26-2022, 10:23 AM	#2
ctrlz Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016 Location: Ocean City, NJ Posts: 3,578	Hope this helps: https://www.camaro6.com/forums/showthread.php?t=549876 Below is from the repair manual. Apparently all three engines use the same thermostat. The description says it starts to open at 180, while the diagnosis guide says it starts at 194. I can't find the spec for the temp. Mechanical Thermostat The mechanical thermostat is positioned between the engine and the radiator. Its purpose is to control the flow of coolant to the radiator. The thermostat will not allow coolant flow through the radiator when cold, coolant flow occurs when the engine has warmed up. Once the engine reaches its operating temperature, generally about 95°C (203°F), the thermostat opens. This actuation of the thermostat starts to occur at 82°C (180°F), when the heated wax contained within a cylinder melts and rapidly expands, pushing the rod and valve assembly out of the cylinder, opening the valve. The temperature dependent actuation of the thermostat allows the engine to warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions. The open thermostat now allows the coolant to flow through the engine cooling circuit to maintain optimal operation temperatures, which is achieved by directing the hot coolant through the radiator for cooling and recirculation DIAGNOSTIC INFORMATION AND PROCEDURES > THERMOSTAT DIAGNOSIS Tools Required J 24731 188 Tempilstick J 24731 206 Tempilstick The coolant thermostat can be tested using a temperature (tempil) stick. The temperature stick is a pencil-like device which has a wax material containing certain chemicals that melt at a given temperature. Temperature sticks can be used to determine a thermostat's operating range by rubbing 87°C (188°F) and 97°C (206°F) sticks on the outlet coolant pipe. 1. Use a tempilstick in order to find the opening and the closing temperatures of the thermostat. 1. J 24731 188 tempilstick melts at 87°C (188°F). The thermostat should begin to open at 90°C (194°F). 2. J 24731 206 tempilstick melts at 97°C (206°F). The thermostat should be fully open at 107°C (225°F). 2. Replace the thermostat if it does not operate properly between this temperature range. Last edited by ctrlz; 01-26-2022 at 10:54 AM.