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Why 2 temp sensors?


turbogrill
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Hi

 

The L28 engine has two engine temp sensors. One measures the  coolant temp (contact with water) and the other measures the block it self with no water connection. 

 

The first was is connected to the gauge the other one is used by the ecu for cold start. 

 

Why have two? Why is the driver interested in the water temp and the ecu in actual block temp. 

Sensors have identical range and response. 

 

I am curious which one to log using MS. 

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Water temp sensors don't read in air. When you run out of water, the sensor reads the warm air in the now empty hose/thermostat/wherever else, so nothing tells the engine to shut down. The cylinder head temp sensor rises fairly quickly without water so shuts the engine down for protection.

 

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2 hours ago, Chiefidiot said:

Water temp sensors don't read in air. When you run out of water, the sensor reads the warm air in the now empty hose/thermostat/wherever 

 

 

That happened to me as well, it sucks. 

 

2 hours ago, Chiefidiot said:

 The cylinder head temp sensor rises fairly quickly without water so shuts the engine down for protection.

 

 

Not mine :)

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