Question about 1994 Chevrolet Camaro

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Red light on tac and engine light

Fans won't kick on and been informed that they're computer controlled True?? My z totally shuts down even when temp isn't that bad

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Check the relays for the fans if they are not orking it wwill lead to overheating issues,there should be either one or two relays to control the cooling fans

Posted on Aug 15, 2008

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What does a temperature sensor control99 Plymouth Breeze Plymouth Breeze


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

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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..

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2002 Suburban_ Engine off but air stays on. When engine is on a/c light stays on & ait stays on even if the fan is turned off


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.

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Engine won't start and shows trouble code P1516 and reduced engine power light is on


Here is the definition of the code.

Possible causes - 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

Sep 28, 2012 | 2002 Chevrolet TrailBlazer

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2006 Hyundai Sonata 3.3L, Check engine light came on, cooling fan stopped working, A/C blows hot when stopped, Temp Gauge showing engine is starting to overheat. Checked relays to A/C and cooling fan. ...


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

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When driving i have rising water temperature


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!

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Over-heating issue


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.

Feb 22, 2009 | 2000 Lincoln LS

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