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However, once water boils, it is an insulator, leading to a sudden loss of cooling where steam bubbles form. Steam may return to water as it mixes with other coolant, so an engine temperature gauge can indicate an acceptable temperature even though local temperatures are high enough that damage is being done. An engine needs different temperatures.
The engine coolant temperature sensor is located in the coolant flange,(under the distributor on the Polo Fox Coupe) on the front of the cylinder head (on transverse-engine vehicles). The bad earth/ground can be traced to an essential ground strap on the front upper transmission bolt.
Thus a very compact, and simple but effective, control function is achieved. The double-valve thermostat may also regulate the flow of coolant to the carburettor: as long as the temperature of the coolant is relative low, the carburettor will be warmed up, so further speeding up the warming up of the engine.
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Crankshaft position sensor; Cylinder Head Temperature gauge; E. Engine coolant temperature sensor; Exhaust gas temperature gauge; I. Idle air control actuator; K.
As the coolant system pressure increases with a rise in temperature, it will reach the point where the pressure relief valve allows excess pressure to escape. This will stop when the system temperature stops rising. In the case of an over-filled radiator (or header tank) pressure is vented by allowing a little liquid to escape.