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

cooling fans

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Old Nov 2, 2014 | 07:38 PM
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94Z28LS1toLT1's Avatar
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cooling fans

which fan is relay 3 i noticed on that relay box it doesnt have it,my cars lower fan (driver side) comes on @ low and high speed drivers side fan doesnt come on,my temp doesnt go past 190,do i need that relay tho or worry about it. the guy that sold me the car doesnt remember what he programmed the fan temps to.
Old Nov 2, 2014 | 10:32 PM
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Re: cooling fans

In 94, you could have early fans (2 relays, no high/low speed) or late fans (3 relays, w/low/high speed).

If you have early fans, only the left one comes on at the low temp threshold and the right fan is added when it reaches the high temp threshold. Both run at high speed.

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Old Nov 3, 2014 | 09:49 PM
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Re: cooling fans

Originally Posted by shoebox
In 94, you could have early fans (2 relays, no high/low speed) or late fans (3 relays, w/low/high speed).

If you have early fans, only the left one comes on at the low temp threshold and the right fan is added when it reaches the high temp threshold. Both run at high speed.

4th Gen LT1 F-body Tech Articles
oh ok thank u so my set up is the the 2 relay set up then? i remember the other 94 i had 2 yrs ago had the 3 relay setup and all 3 relays where in the fuse box. The 94 i currently have has only 2 relays,so relay #3 is open n i dont need to worry with that relay spot?
Old Nov 4, 2014 | 09:44 AM
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Re: cooling fans

Check your VIN. A car produced early in the model year is more likely to have the 2 relay "early production" setup.
Old Nov 4, 2014 | 12:12 PM
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Re: cooling fans

Originally Posted by 94Z28LS1toLT1
oh ok thank u so my set up is the the 2 relay set up then? i remember the other 94 i had 2 yrs ago had the 3 relay setup and all 3 relays where in the fuse box. The 94 i currently have has only 2 relays,so relay #3 is open n i dont need to worry with that relay spot?
That would be correct, if an early production 94. If both your fans work (secondary fan comes on at high temp threshold), then you are good.
Old Nov 4, 2014 | 09:28 PM
  #6  
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Re: cooling fans

Originally Posted by Injuneer
Check your VIN. A car produced early in the model year is more likely to have the 2 relay "early production" setup.
hey Fred vin is 2G1FP22P8R2132438

Originally Posted by shoebox
That would be correct, if an early production 94. If both your fans work (secondary fan comes on at high temp threshold), then you are good.
Hey Rob thank you,yea i remembered that secondary fan would come on in the summer time when its hot outside. Its colder now out here so just the primary is kicking on
Old Nov 6, 2014 | 06:42 PM
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Re: cooling fans

Originally Posted by Injuneer
Check your VIN. A car produced early in the model year is more likely to have the 2 relay "early production" setup.
looked @ the side of the door i see a date that says 11/93 im assuming thats the date nov 1993 early 1994
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