Jeff, this is a very common problem with our platform. Replace your fan clutch, while you're there, replace your waterpump also, it's cheap and it WILL go out. If you can swing it, buy a Hayden brand fan clutch, or buy one for an 08 or 09', those are better. If you do it yourself, do yourself a favor. Cut a notch in the upper fan shroud where the upper radiator hose is. Will save you tons of time, potential breakage, and frustration.
Your fan has an electronic variable clutch [ electro-viscous clutch ] if fails can lock up or not turn at all if locked up need to replace
Failed coolant temp sensor.
Testimonial: "Where is that located"
Did you check the cooling fan relay , maybe stuck on .
The PCM controls the electro-viscous fan clutch engagement. The PCM regulates a 12-volt pulse width modulated signal (PWM) to the cooling fan relay. The PWM signal determines the ON time of the relay. As the commanded state of the fan clutch increases, so does the ON time of the relay. This ON time directly effects the amount of time the solenoid, which is internal to the fan clutch, is energized. When the solenoid in the fan clutch is energized, it opens the spring loaded valve and allows fluid to flow from the storage chamber to the fluid coupling of the cooling fan clutch, increasing the fan speed. When the solenoid is de-energized, the spring loaded valve closes, and blocks the path of the fluid to the fluid coupling of the fan clutch, reducing fan speed.
The fan has the ability to create a feedback signal, so the PCM has an actual fan speed input. This is done with a hall effect sensor internal to the fan clutch. The PCM supplies a 5-volt reference and a low reference to the hall effect sensor. The hall effect sensor returns a signal pulse through the cooling fan speed signal circuit in response to the reluctor track passing by the magnetic field of the hall effect sensor.
The PCM commands the cooling fan to 100% under the following conditions:
• Engine coolant temperature exceeds approximately 129°C (264°F).
• The transmission oil temperature exceeds approximately 151°C (304°F).
• A/C refrigerant pressure exceeds 1655 kPa (240 psi).
• When certain DTC's set. These include P0116, P0117, P0118, P0125, P1481, P1482, and P1484.
The scan tool can engage the cooling fan clutch. This is done with the engine controls special function menu screen. To engage the cooling fan, It can take up to 2 minutes for a 100% command with the engine at 2000 RPM. The lower the engine speed, the longer it will take the fan to engage. To disengage the cooling fan, it can take up to 2 minutes with the engine at 2000 RPM. The lower the engine speed, the longer it will take to disengage. In lower ambient air temperatures the cooling fan will engage in less time, however, it will take longer to disengage due to the properties of the fluid vs. temperature.
Under certain conditions the cooling fan may be engaged at engine restart. They are as follows;
• The cooling fan was engaged at the time the engine was turned off
• The fluid may bleed from the storage chamber into the fluid coupling of the cooling fan
Although the fan is commanded off at this time due to a cold start condition. This is the most likely time a vehicle driver will notice that the fan noise is excessive compared to normal engine starts with out cooling fan engaged. As the engine speed is increased the fan noise will be louder than before. These are normal conditions that can be very intermittent.
Engine Coolant Indicator
Engine Coolant Indicator
ENGINE COOLANT HOT IDLE ENGINE
The radio activates an audible warning as requested by the instrument panel cluster (IPC). The IPC sends a class 2 message to the radio indicating the chime duration of 4 pulses. The warning sounds and the appropriate indicator illuminates in the driver information center (DIC) when the following occurs:
• The IPC determines that the coolant temperature is greater than 125°C (257°F). The IPC receives a class 2 message from the PCM indicating coolant temperature.
• The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
The IPC turns OFF the engine coolant indicator when the engine coolant falls below 122°C (252°F).
SOURCE: P0172 and P0128 Error Code 2003 Trailblazer 4WD
PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.
SOURCE: Normal coolant temp for 2003 Jeep Grand Cherokee city/highway V6
U should have the accuracy of the gauge tested before u spend any more money on this, factory gauges are not very accurate. U are still in the normal zone though no matter what the other expert says, and jeep Cherokee's run hotter than 195 due to how small the engine bay is, my friend and fellow tech works for a jeep dealer and says hot running on V6's and overheating esp on the V8's is a common issue even on new trucks.
SOURCE: 2005 chevy cobalt cooling fan will not engage car
It may be your water pump. Most times the car will not tell you it's hot if the thermostat is not working. If you want to check if your water is circulating; open your hood, look at the radiator, there are 2 large hoses (usually one on each side) coming out of it. Turn on your car, feel/squeeze both hoses and feel that there is not a lot of pressure and you can't feel the water circulating. Wait for the car to hit the midline between hot and cold, and feel the hoses again. You should have no problem feeling the water running through the hoses and they should be very warm. If you don't feel the water, and the hoses are still cold, you should drive your car with the a/c or heat blowing at all times until you fix the water pump. It should be fixed ASAP if that's the problem. If you feel water flowing and it still doesn't kick on you should take it to a mechanic, it may be a computer issue.
SOURCE: Electric Radiator Fan Does Not Come On
Chevy dealer says will not come on until temperature reaches 219 f
SOURCE: 2003 chevrolet trailblazer 4.2 problem code p1481
See attached picture for location of temp. sensor, but that code has nothing to do with temp sensor. The speed of the fan does not agree with the commanded speed, you may have another bad fan clutch.
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