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

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Old Jul 27, 2004 | 12:45 AM
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what are the 2 sensors in the heads called. one on each head in same place? and are they neccesary?
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Old Jul 27, 2004 | 12:49 AM
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if I remember correctly, they are temp sensors...
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Old Jul 27, 2004 | 01:23 AM
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On my '85 the drivers side head has the cluster temp gauge sensor and the passenger side head has the fan temp switch.
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Old Jul 27, 2004 | 02:20 AM
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the reason I'm asking is I'm swapping in a 400 and the sensor thread holes are different sizes I'm using early style heads. will I be able to find a compatible sensor that will fit the bigger holes?
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Old Jul 27, 2004 | 11:11 AM
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As stated, one is a switch for the aux fan and the other is the temp gauge sending unit (sensor). If you don't care about those functions, they aren't "necessary". Since they are pipe threads, you can probably use pipe bushings to adapt to larger holes.

RACE ON!!!
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Old Jul 28, 2004 | 02:32 AM
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thanks Jim will you be at RMR this friday? I'll be there won't be racing though
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Old Jul 28, 2004 | 08:43 AM
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I just did tha same thing.I bought brass fittings from NAPA, the local auto parts store.Thay had them in stock.
Getting the old plugs out of the old head is hard.You need to heat them till red hot with acedeline torch.
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Old Jul 28, 2004 | 10:02 AM
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Originally Posted by nobodyunknown
I just did tha same thing.I bought brass fittings from NAPA, the local auto parts store.Thay had them in stock.
Getting the old plugs out of the old head is hard.You need to heat them till red hot with acedeline torch.
actually the heads were completly rebuilt and only one head has a plug in it. I tried getting it out but didn't work thanks for the tip on getting it out
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Old Jul 28, 2004 | 10:58 AM
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Default now the question is where to buy

well my temp sensor wire got melted on the header and the plastic on the it is also cracked and likes to fall off. thas how the wire got burnt. where does the wire go to? is it the fan switch under the Master Cylinder? is it a normal part that any parts store would have on stock?

thanks
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Old Jul 28, 2004 | 11:19 AM
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Originally Posted by MY84REDC4
well my temp sensor wire got melted on the header and the plastic on the it is also cracked and likes to fall off. thas how the wire got burnt. where does the wire go to? is it the fan switch under the Master Cylinder? is it a normal part that any parts store would have on stock?

thanks
The sensor wire goes to the temp gauge in the dash. I would expect you would find it an an auto parts store.
=88421VETTE] thanks Jim will you be at RMR this friday? I'll be there won't be racing though
I plan to be there. The car hasn't been running up to snuff, lately, and the driver has been doing worse. Look me up.

RACE ON!!!
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Old Jul 28, 2004 | 11:31 AM
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it is the fan temp switch on the passenger side. sorry I didnt clarify.
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Old Jul 28, 2004 | 12:20 PM
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The wire off the fan switch, circuit 335, is brown. It is spliced with a tan wire from the compressor at a connector. After making it's way through a couple of other connectors, it ends up at terminal "B" on the fan relay as a green/white wire. The fan relay is mounted on the inner wheel well, approximately below the master cylinder.

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Last edited by CFI-EFI; Jul 28, 2004 at 12:24 PM.
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Old Jul 29, 2004 | 01:00 AM
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I will prob bypass the fan relay sensor. and just run the temp gauge sensor. I got an adaptor for the sensor thanks for all your help
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