[C2] Engine overheating

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Apr 3, 2026 | 01:41 PM

#41

Pg65coup

Intermediate

Joined: May 2024

Posts: 37

Likes: 76

From: Wisconsin fox valley area

Quote:

Originally Posted by Tom DeWitt

I think your results are the exception and not something I would recommend. Typically disabling the vacuum advance will result in higher coolant temperatures due to the retarded timing

I think it more of the air leak (lean), then the bump down on timing. i just back timing it off to be safe. Until I can rebuild distributor and put new vacuum canister on it

Apr 3, 2026 | 05:33 PM

#42

63silver

Burning Brakes

Joined: Oct 2021

Posts: 946

Likes: 339

From: Northern Ont

I worked Pipeline Construction and when the mechanic came in and ordered everything we called it the Pipeline overhaul. Not sure what was wrong so just order everything.

Last edited by 63silver; Apr 4, 2026 at 06:56 PM.

Apr 4, 2026 | 10:40 AM

#43

Jam421

Racer

Joined: Mar 2015

Posts: 466

Likes: 155

Since your mechanic installed the Dewitt radiator I'd like to suggest to also consider a direct fit Fan Shroud.

Apr 4, 2026 | 03:35 PM

#44

John S 1961

Melting Slicks

Joined: Jul 2004

Posts: 2,451

Likes: 315

From: Scottsdale AZ

Quote:

Originally Posted by John S 1961

Pressure test to be sure it's not a leaky head gasket first. Because it could be and has the same symptoms. Then dewitts and only dewitts. Bleed carefully

Make sure to do this. Don't assume because it runs nice it doesn't have a leaky head gasket. These old used cars tend to sit a lot and they are always subject to electrolysis. I had a be cool radiator that ate itself from the inside out and failed a head gasket. Test for voltage in your cooling system. You have a low voltage battery there going day and night.

Report your pressure test results here

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