C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

normal temps?

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Old Sep 28, 2004 | 08:21 PM
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From: Troy Pa.
Default normal temps?

I was wondering what normal operating temps for oil and water are for an 86 vette. I just buaght it and think I'm having overheating problems. Its my first and I've only had it for two weeks. At speed it runs aruond 180 but at idle it got up to 210 and the fan didn't kick on I checked the fuses jumped the fan moter its good and put in a new relay and it still won't kick on at 210 and I won't run it hotter than that until I learn a little more about cooling temps. thanks George
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Old Sep 28, 2004 | 08:26 PM
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Don't worry about it.
Your main fan turns on at 228.
Your auxilury fan turns on at 238. [I think these are the factory settings].

Also, normal for me is when the coolant & oil temps are within 10 degrees of one another.
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Old Sep 28, 2004 | 08:38 PM
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From: Troy Pa.
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Thanks I wuold hate to smoke my engine before I smoke the tires
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Old Sep 28, 2004 | 10:35 PM
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Why wait to do the tires?
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Old Sep 29, 2004 | 12:48 AM
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When my '86 was stock the coolant ran anywhere from 195-210 and oil seemed to stay around 230
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Old Sep 29, 2004 | 12:58 AM
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Yeah, those temps sound completely fine. If you ever notice it up in the 240s or, heaven forbid, 250s - shut 'er down. Otherwise, Drive On!!!
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Old Sep 29, 2004 | 01:01 AM
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Seemed hot to me, too. But that's where they run.

Welcome to the fun!
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Old Sep 29, 2004 | 05:19 PM
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Sounds right.
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Old Sep 29, 2004 | 05:59 PM
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Originally Posted by Wayne88
Don't worry about it.
Your main fan turns on at 228.
Your auxilury fan turns on at 238. [I think these are the factory settings].
Close... The main fan is controlled by the ECM. Itshould come on when the coolant temp reaches 226F or 108C. The aux. fan if you have one is controlled by the coolant fan temp switch and should turn on at 228F or 109C. This is spec. according to the 88 GM Factory Service Manual. The 86 should be the same.

Tip for checking the fans:
Setting the A/C to full on cold should build pressure in the A/C coolant fan switch which will open at 233 psi and send a signal to the ECM causing it to start the fans. If you turn on the A/C and the fans don't come on within a couple minutes (at any temp) you have a fan/switch problem. Otherwise any temp below 226 and GM doesn't bother to turn on the fans. You should be fine.
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