L98 temperature question
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Pro
Joined: Oct 2003
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From: Baxter MN
L98 temperature question
I asked this question in the tech section but haven't gotten a response. Hopefully someone here can help me.
My '91 gets very hot in traffic. I was told I could buy an after-market temp sending unit that turns fans on at 200* and off at 185* and mount it in addition to my stock unit. My information is that I could add this unit on the drivers side of the block, and splice the unit into existing fan wiring. Has anyone done this? Any problems or concerns with such an arrangement?
TIA.
Glen
My '91 gets very hot in traffic. I was told I could buy an after-market temp sending unit that turns fans on at 200* and off at 185* and mount it in addition to my stock unit. My information is that I could add this unit on the drivers side of the block, and splice the unit into existing fan wiring. Has anyone done this? Any problems or concerns with such an arrangement?
TIA.
Glen
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St. Jude Donor '08-'10
have you opened the plenum and checked for debris? If not there is a good paper in the "tech tips" section that can guide you. Trash in there will block the air flow and cause over heating.
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Pro
Joined: Oct 2003
Posts: 732
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From: Baxter MN
From what I understand, you would leave the original unit alone. Add the new sending unit to the location on the drivers side of the block. Use a new wiring harness to run from the new sending unit to the main fan relay down by the fans and to a separate power source. Thus, if the new sending unit is triggered at, say 200*, it would close the contacts to allow power from the separate source to energize the fans. The stock unit would never sense anything cause it is set to energize at 230*. At roughly 185* the new sending unit would open the contacts again, thereby shutting off the fans.
It all sounds very logical to me. But I don't know if I am missing something in this arrangement that could be detrimental to my engine.
Any ideas?
Glen
It all sounds very logical to me. But I don't know if I am missing something in this arrangement that could be detrimental to my engine.
Any ideas?
Glen
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Brett Foote
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From: SE NY
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The control unit you need to buy is an Aux Fan switch used with the optional booster fan on '85-'89 Vettes. You remove the plug in the block below #1 & #3 spark plugs and screw in the switch. Then use my Tech Tip to wire it into the main fan relay.
The ECM brings on the fan by grounding the control line to the relay; the Aux Fan switch will do the same when coolant temp reaches its trip point.
Select the Aux Fan switch to match your T-stat of choice.
The ECM brings on the fan by grounding the control line to the relay; the Aux Fan switch will do the same when coolant temp reaches its trip point.
Select the Aux Fan switch to match your T-stat of choice.