A faulty thermal switch causes cold start difficulties.
Examination
When checking, the engine must be cold, the temperature of the coolant is below 30°C. If necessary, remove the thermal switch and cool in a water bath.
Disconnect the high voltage wire -terminal 4- at the ignition distributor (central cable) and close it to ground. If necessary, use an auxiliary cable of the same size.
Disconnect the cold start valve plug and connect a voltage tester or test lamp to the plug contacts. The thermo-temp switch is checked via the cold start valve connector.
Operate the starter for 10 seconds. The tester's LED should light up for 1-8 seconds, depending on the temperature of the thermal switch. The time for the first switch-on depends on the air temperature and must be within the permissible limits, see diagram. For example, the temperature of the coolant is +10°C, the duration of switching on is 2-2.5 seconds.
If the tolerance is not maintained, replace the thermal switch.
Connect the high voltage wire with the ignition distributor plug to the cold start valve.
Withdrawal
Disconnect plug at thermal switch.
Unscrew the switch.
Installation
Screw on the thermostatic switch, connect the plug.
Check coolant level, top up if necessary.
Diagram for temperature sensor with 5-cylinder engine
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