Overheating Question

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Sep 26, 2007 | 06:13 PM

Steve 427

Thread Starter

Instructor

Joined: Sep 2007

Posts: 227

Likes: 8

Overheating Question

Whie driving my 69 427/435 the temp stays normal in the middle of the gauge for maybe 15-20 minutes. Then all of the sudden it just goes very close to the red. It then starts spewing coolant out of the expansion tank. The motor is fresh and the fan seems to be working fine. Any ideas???
Thanks

Sep 26, 2007 | 06:33 PM

dannyman

Melting Slicks

Joined: Dec 2006

Posts: 2,669

Likes: 3

From: Kingston Ontario

Sounds like air trapped in the engine coolant system.

Sep 26, 2007 | 09:07 PM

gkull

Team Owner

Joined: Apr 1999

Posts: 21,953

Likes: 1,445

From: Reno Nevada

2024 C3 of the Year Finalist- Modified

Quote:

Originally Posted by Steve 427

I installed a Morroso higher filler point in place of the goose neck thermistat housing. I run my over flow cap up on top and have a non blowby on the radiator.

Last edited by gkull; Sep 27, 2007 at 10:27 AM.

Sep 26, 2007 | 10:50 PM

Z-man

Race Director

Joined: Nov 1999

Posts: 10,643

Likes: 8

From: Foxfield CO 1970 Convertible

Quote:

Originally Posted by dannyman

Sounds like air trapped in the engine coolant system.

Just let it cool, top it off, and go for another drive. It might take 3 to 4 times before you get all the air out.

Sep 27, 2007 | 07:31 PM

Brown78

Burning Brakes

Joined: Jan 2004

Posts: 769

Likes: 0

From: Ft. Lauderdale Fl

What size rad-cap do you have??? Mine used to boil over. Then I changed the cap to a 18 lbs. cap with a pressure release. It stopped the boiling over when I stopped and turned it off.