The intake air temperature is at least 20°C.
Thermostat housing and vacuum diaphragm checked.
Detach hoses -1- and -2- from thermostat -3-.
Before checking, the engine should not run for more than 5 minutes.
When idling, disconnect hose -2- from vacuum diaphragm -4-. You should hear the shutter sound in the thermostat housing. Otherwise, replace the thermostat.
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