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I have a 2004 chevy blazer and it overheats. i replaced the temostat water pump, fan clutch and it still overheats

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Replace the sensor, Tim

Posted on May 29, 2011

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1 Answer

How to replace water pump on 4.2 liter 2004 trail blazer LS


4 bolts hold the shroud on. 2 on bottom,2 on top. Leave on in on the top until you remove the clutch fan. Clutch fans are a pain to get off with out the right tools. Once off, remove the bolt from the shroud and pull them out together. Remove the serpentine belt. Remove the pump.

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When hot, check to see if the fan clutch is engaged fully, if the fan is spinning slower than the engine, it may be bad and needs replacement.

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Chevy 2004 blazer ac stoped working abruptly and stops the engine if you turn on the ac could you just replace the clutch if that is what is defective? instead of the whole compressor and all the other...


I mworking on my blazer AC unit now . You have a problem with the compressor clutch or the compresser Its likely the clutch its supposed to cycle about 8 times per minute . So it goes on then off 8 times per munite this is normal . However if the clutch dosen't spin then the belt will drag on the clutch pulley this will stall the engine until the belt wares out but this will damage every part that the belt rides on . The water pump the alternator powersteering pump and belt tenisinor not to mention the belt .It sounds like your clutch is seized try not to run it until you can figure out why the clutch isn't spining

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1 Answer

My 2004 TrailBlazer overheats in running only I changed acdelco water pump , thermostat and coolant water and still overheat


check your fan clutch, very typical problem on these 4.2L engines. These fan clutches are electronically controlled. Another issue may be clogged radiator.

May 31, 2010 | 2003 Chevrolet TrailBlazer

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Chevy trailblazer check engine light


P0128 is coolant operating temperature operating too low. This can be contributed to the Thermostat stuck open or faulty electronic radiator fan clutch. This is common, I had the same issue and replaced the thermostat and fan clutch and had the clutch re-programmed (required) at the dealer. As for the P0410, check the air pump fuse, if blown it will set this code on. Also check the air pump hoses for water and cracks. Hopefully this helps!!

Apr 20, 2010 | 2004 Chevrolet TrailBlazer

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Fan cluth or fan assembly


I have a 2004 trailblazer and it keeps over heating at stop lights or while driving slow. I have replaced the thermostat and water pump, but this issue still shows up. It is fine while driving down the highway at 55-65 mph. I have also cleaned the radiator and blew through the fins to clean out the dirt and bugs. Not sure if clutch is operating correctly. How can one tell if it is and are these electric? I know there are approx 5 wires running to the front of the clutch, but not sure if this gets a voltage signal to engage the clutch fan. Any ideas?

Apr 23, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

How to change a water pump?


You will need to remove the upper fan shroud, remove the fan clutch that is threaded onto the water pump it is easiest to get the tool for this or you can use a bar between two of the pulley bolts and use a cresent wrench on the big nut. After you remove the fan clutch there is the small hoses on the top of the water pump and the lower hose on the bottom of pump. Then there are only four bolts holding the pump to the motor. Reinstall in reverse order. Let me know if you need more help.

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1 Answer

2001chevy blazer


it is not to hard to change the pump but you will need a fan clutch tool. the water pump is on the front of the motor with the fan attached to it.

Dec 02, 2008 | 2001 Chevrolet Blazer

3 Answers

2004 Jeep wrangler 4.0 - 6cyl overheating


I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.

Sep 02, 2008 | 2004 Jeep Wrangler

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