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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.
Pages in category "Engine sensors" The following 11 pages are in this category, out of 11 total. ... Engine coolant temperature sensor; Exhaust gas temperature gauge; I.
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.
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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.
When an engine first starts, the coolant temperature is cold and the bimetallic strip is closed, which in turn supplies the cold start injector with current. A small heater coil is built into the thermotime switch, which effectively gives a timed output to the cold start injector with the timing duration dependent on the temperature of the engine.
The engine temperature on modern cars is primarily controlled by a wax-pellet type of thermostat, a valve that opens once the engine has reached its optimum operating temperature. When the engine is cold, the thermostat is closed except for a small bypass flow so that the thermostat experiences changes to the coolant temperature as the engine ...
Control systems grew more sophisticated as automakers gained experience; Volkswagen's "Coolant Controlled Exhaust Gas Recirculation" system of 1973 exemplified this evolution: a coolant temperature sensor blocked vacuum to the EGR valve until the engine reached normal operating temperature. [5]
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