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A temp sensor information is used for all kind of things even on 1999 vehicle . The PCM/ECM -engine computer use temp info for fuel control strategy , turning on the radiator cooling fans , information for the temp gauge . The temp. sensor really doesn't control anything , it's a input to the engine computer , the engine computer controls thing's . How Engine Coolant Temperature Sensors Influence The Modern Powertrain
The PCM -engine computer energizes the cooling fan relays , hi an low speed , according to information received from the coolant temp. sensor. an information programmed into the PCM . Usually around 221 degrees the PCM will energize the low speed relay . Is your car's temp . getting that high ? The best way to diagnose these types of problems is by hooking up a scan tool that can read engine sensor data parameters to see what the temp. of the engine is . Also a scan tool with bi-directional controls , this would be useful to see if the PCM can control the fans ! There could be DTC'S - diagnostic trouble codes stored in the PCM . Not all DTC'S turn on the MIL light , check engine etc..
Fan will run for a certain period of time after shutting down motor of vehicle. This is normal. Your engine is still hot when you turn the key off. There are sensors that tell the computer when the engine is cool enough for the fans to shut off.
- Faulty Throttle Actuator Control (TAC) module - Throttle Actuator Control (TAC) module harness is open or shorted - Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)
P1516 CHEVROLET Description
The Throttle Actuator Control (TAC) module contains data which is
essential for proper TAC operation. The TAC module continuously test the
integrity of this data. When the TAC module is unable to write or read
data to and from Random Access Memory (RAM), or the TAC module is unable
to correctly read data from the flash memory or and internal TAC module
processor fault is detected and the Detected Trouble Code (DTC) is set.
Read more: http://engine-codes.com/p1516_chevrolet.html#ixzz286Gl3cSo
If you have checked all the standard items and they are in working order then your problem maybe you radiator fan control module this module is bolted to the outside frame of the drivers side under the drivers side headlight you need to take the drivers side head light assembly out to see it. it has two cables plugged into it. It costs about $400
The coolant temperature should rise until the gauge indicated roughly half. if it continues to go until it reaches the red "H" shut the vehicle off and wait for the car to cool off. The most likely cause of this is the thermostat. It is a $4-$10 part and usually is easy to change. Thanks for asking!
2000 LS cooling system is a very tough system to diagnosis. Any kind of air in system will totally stop the flow and cause it to heat.That is the reason it has 2 places to bleed the air from the system.The one at the engine where the upper hose connects and one beside the brake booster near the degas bottle(rubber tube with a screw end).
The cooling fan is also hydraulic and has it's own power steering pump. The good thing about this system is that it uses a cylinder head temp sensor that measures the metal temp and not engine coolant temp. When the PCM sees the CHT reach a certain temp it will start shutting down 4 cylinders at a time and use these cylinders as actual air pumps to help cool the engine down.If this does not work it will then shut the engine down totally until the temps come back down.
The most common problems we see are thermostats,crack degas bottle,or a leak somewhere,and of course air in the system. Have not seen a cracked head yet however did see one that pushed the plug out of the cooling port in the head but this also filled the oil with coolant.
Have also seen cooling fans that would not work until PCM demmanded high speed,caused by a weak power steering pump.