LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

fans will not turn on when car is running

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Old Aug 12, 2008 | 10:30 AM
  #1  
93camarochrisz28's Avatar
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From: fl
fans will not turn on when car is running

ok i can jump the b,a on the aldl plug and fans turn on but when i the car is just running the fans will not come on and will start to over heat ? i really dont know what to do i
Old Aug 20, 2008 | 12:07 AM
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BCdawg57's Avatar
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From: Carroll, Oh
I have the same problem.
Old Aug 20, 2008 | 12:19 AM
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Injuneer's Avatar
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From: Hell was full so they sent me to NJ
The PCM turns the fans on based on the temperature readings from the coolant temp sensor in the water pump housing. Check the sensor to see if it is accurate (courtesy of Shoebox):

http://shbox.com/1/4th_gen_tech2.html#ect

Stock programming turns the first fan on at 226*F (or low speed mid-94 and up) and the second fan (or high speed mid-94 and up) at 235*F. Is it getting that hot?

Do the fans run when you turn the A/C on?
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