92 LT1 fans
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Instructor
Joined: Jul 2010
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From: Siloam Springs AR
92 LT1 fans
On my 92 should both fans be on at the same time, all the time. Or does one kick on then when needed the other one kicks on. Why I'm asking is because the car was almost to 260 and one was on but the other wasn't. I know they both should have been at that temp but is it a fan or is it a module that is supposed to turn it on that is bad. Also is it too much trouble to make a manual switch to turn it on, then when the switch is off it will go back to auto? That way when I'm at the track in line the fans can run without the engine on.
Instructor
Joined: May 2006
Posts: 106
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From: Greenbrier AR
On my 92 should both fans be on at the same time, all the time. Or does one kick on then when needed the other one kicks on. Why I'm asking is because the car was almost to 260 and one was on but the other wasn't. I know they both should have been at that temp but is it a fan or is it a module that is supposed to turn it on that is bad. Also is it too much trouble to make a manual switch to turn it on, then when the switch is off it will go back to auto? That way when I'm at the track in line the fans can run without the engine on.
If the A/C is on, the primary should turn on.
On my '92, the analog gauge will go to 260 (maxed out), but the digital gauge will be under 240. (at digital 245, the A/C, if on, will stop and turn to heater - I know this, because I've had cooling issues in the past).
When I've done autox, I turn the A/C on while idling in grid and that keeps the temp around 220. Without the A/C on, the temp should cycle from 230 to 215 or so.
You can reprogram the ECM to change the temp at which fans turn off/on. As for adding a switch, I can't imagine it's too hard. Check your FSM for the wiring diagrams. The relays are just under the left side headlight.
Thread Starter
Instructor
Joined: Jul 2010
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From: Siloam Springs AR
So what should the normal operating temp be if the A/C is off? Should I be worried about the analog gauge being near 260? Do I need to see if autozone can check the fan to see if it is working? Driver side works fine but the passenger side wasn't on last night but the A/C was off.
Instructor
Joined: May 2006
Posts: 106
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From: Greenbrier AR
So what should the normal operating temp be if the A/C is off? Should I be worried about the analog gauge being near 260? Do I need to see if autozone can check the fan to see if it is working? Driver side works fine but the passenger side wasn't on last night but the A/C was off.
Personally, I don't worry until the digital gauge says the temp is over 240 - no matter what the analog gauge says. I suspect other people may worry sooner. Definitely, if your digital gauge hits 235 and the second fan doesn't come on, something's wrong.
If you're actually moving (highway), it should stay below 200.
Vader's site has some decent information on determining if you're overheating, but it's more L98-specific (in general, most of it applies).
Drifting
Joined: Oct 2008
Posts: 1,936
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From: Rochester Hills Michigan
This is from Gordon Killebrew:
Left fan comes on at 219 (shop manual has 226).
Right fan comes on at 235 (shop manual has 234).
A/C turns on both fans.
Normal operating temp is 220 to 240. At 250, check gauges light will come on.
Mid-America sells a one-or-two position switch (Gordon designed for them) that allows you to switch on one or both fans anytime you want them on.
Left fan comes on at 219 (shop manual has 226).
Right fan comes on at 235 (shop manual has 234).
A/C turns on both fans.
Normal operating temp is 220 to 240. At 250, check gauges light will come on.
Mid-America sells a one-or-two position switch (Gordon designed for them) that allows you to switch on one or both fans anytime you want them on.
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I've got the 92. Primary fan at 228. Secondary (AC fan) at 235. These temps seem high to me, so I head it off by cranking the AC on at about 210 and my temperature stops right there, even while idling in traffic.
If you want to check, just start the vette and leave it parked in the sun ... it'll heat up quick. Stand up front and right around 228, you'll hear the main fan spin up - it's very audible. Then you'll hear the secondary fan shortly after.
Good to have another of the 92 club on the scene!
Andy of Philadelphia
If you want to check, just start the vette and leave it parked in the sun ... it'll heat up quick. Stand up front and right around 228, you'll hear the main fan spin up - it's very audible. Then you'll hear the secondary fan shortly after.
Good to have another of the 92 club on the scene!
Andy of Philadelphia
