Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Thermostat, Engine Cooling

WARM-UP PHASE

Up to a coolant temperature of approximately 87° C (189° F), the main valve is closed and the bypass valve fully open.

PARTIAL-LOAD PHASE

The main valve begins to open at a coolant temperature of 86° C (189° F), and a small amount of coolant flows through the radiator.

FULL-LOAD PHASE

The main valve is fully open at a coolant temperature above 102° C (216° F).