Erratic water temp - Chevelle Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 2 (permalink) Old Jan 9th, 02, 7:24 AM Thread Starter
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Join Date: Dec 1998
Location: Colorado Springs, CO
Posts: 258
Hi guys,

I just bought a 65 Elky with a hopped up 350 in it. Rumpety cam, Holley double pumper, headers, electric fans.

The water temp guage is all over the place. Driving around town in 70 degree weather, it will shoot from 180 to 220 in 3 seconds, stay there for two minutes and then suddenly drop back down to 180. It does not seem to be directly tied to speed, although it does climb when I am at a light. Turning on the fans often has little affect.

Here's the thing. The water temp guage is plumbed to the block right behind the #1 header tube. Is that the right place for it? I think the header is affecting the temp. I put some convoluted tubing and reflective tape around the sending line to protect it, but the problem persists.

Should I move the sending unit to the manifold?


Jameel Qazi
#'s 67 SS
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post #2 of 2 (permalink) Old Jan 9th, 02, 9:47 AM
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Join Date: Oct 1998
Location: Huntsville, AL
Posts: 453
Sounds like a bad ground or a bad sending unit. If its old, you might want to replace the sending unit as they are only a couple of bucks.

I don't think moving the unit would help. I've run the sending unit in both places(Head or intake) and I couldn't tell any difference.

TC# 717
ACES #1641
1967 Chevelle SS396/375
1967 RailVelle(Parting out)
1964 Chevelle 283/195
1975 Corvette 396/425 "Wow, that's a mighty strong 350!"
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