Hypertech Chip owners Please Respond
Thread Starter
Team Owner
Joined: Jan 2003
Posts: 20,322
Likes: 248
From: Summerland B.C. Canada
Hypertech Chip owners Please Respond
My 86 has a hypertech chip. My primary fan comes on at 160'. At what temp is the aux fan turned on ?? Thanks !! :confused: :cheers:
Team Owner
Joined: Sep 2001
Posts: 62,160
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: Hypertech Chip owners Please Respond (AGENT 86)
To my knowledge the aux fan is not controlled by the ECM.
Burning Brakes
Joined: Feb 2002
Posts: 804
Likes: 5
From: Fresno CA
Re: Hypertech Chip owners Please Respond (AGENT 86)
The secondary fan is controlled by the switch in the passenger side head. If you have the thermomaster chip you should use Hypertech's p/n 4026 which turns the secondary fan on at 176 and off at 166.
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: Hypertech Chip owners Please Respond (eguyett1985)
That's the deal, the two fans are controlled separately:
-main fan is controlled only by the ECM
-aux fan is controlled only by the aux fan switch in the block below #1 & #3 plugs.
You can either use that new aux fan switch to bring on the aux fan earlier or wire the grn/wht wire from the main fan relay into the same wire on aux fan relay.
-main fan is controlled only by the ECM
-aux fan is controlled only by the aux fan switch in the block below #1 & #3 plugs.
You can either use that new aux fan switch to bring on the aux fan earlier or wire the grn/wht wire from the main fan relay into the same wire on aux fan relay.
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Re: Hypertech Chip owners Please Respond (vader86)
To my knowledge the aux fan is not controlled by the ECM.
[Modified by ld85, 6:57 AM 6/10/2003]
Le Mans Master
Joined: May 2003
Posts: 5,362
Likes: 3
From: Delray Beach FL
Re: Hypertech Chip owners Please Respond (AGENT 86)
On my LT-1 (93), the Hypertech Thermomaster chip kicks both fans on at around 160. I think Chevrolet changed the way the fans were controlled on the LT-1's.
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