Overheating 89

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Dec 7, 2010 | 04:40 PM

supersurveyor

Thread Starter

5th Gear

Joined: Mar 2009

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Overheating 89

After replacing thermostat-- engine overheated to 275 degrees after less than five mile run and started spitting out antifreeze???
Any suggestions? thanks

Dec 7, 2010 | 05:08 PM

69-90 Vette

Cruising

Joined: Oct 2010

Posts: 14

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From: Hampton VA

Your thermostat is faulty and stuck in the closed position. I always check them by boiling them in a pot of water to make sure they open before installing it in the car.

Dec 7, 2010 | 05:15 PM

Muffin

Race Director

Joined: Jun 1999

Posts: 14,924

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From: Merritt Ils Fl

You didn't by chance put the Tstat in upside down? Don't laugh, I did it once in a boat engine.

Dec 7, 2010 | 05:26 PM

hooked073

Melting Slicks

Joined: May 2010

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From: Conowingo Maryland

my though is you did not have it full of a/f.

Dec 7, 2010 | 05:59 PM

62panshovel

Intermediate

Joined: Oct 2010

Posts: 44

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From: Wilmington NC

Burping

My 89 takes a while to get burped. Not sure how you ever got it full if you did not wait for the stat to open and rev to 2k while topping.

Dec 7, 2010 | 09:32 PM

69-90 Vette

Cruising

Joined: Oct 2010

Posts: 14

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From: Hampton VA

I don't see how you can be low on antifreeze if it is spilling out. What happened when the thermostat didn't open is the antifreeze expanded from the heat and spilled out of your overflow tank. I had a Monte Carlo do this very thing when the thermostat went bad.

Dec 7, 2010 | 09:50 PM

CorvetteMike2024

Corvette Enthusiast

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From: So. Cal.

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Quote:

Originally Posted by 62panshovel

My 89 takes a while to get burped. Not sure how you ever got it full if you did not wait for the stat to open and rev to 2k while topping.

Burping gets rid of trapped air inside your cooling system.

Your car will run hot if you have not properly burped it.

Dec 7, 2010 | 09:50 PM

Siveck

Drifting

Joined: Aug 2002

Posts: 1,773

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From: Birmingham AL

Quote:

Originally Posted by hooked073

my though is you did not have it full of a/f.

This happened with mine a few months ago. The heater core or radiator leaked slighlty until the level was low enough to create an air bubble which superheated the remaining coolant which sent some out of the overflow. I am replacing my heater core at the moment. My coolant level sensor is apparently faulty so i never knew the level was getting low. Replace the thermostat as it is cheap. Felpro makes a nice reuseable gasket with an o-ring. Check out your coolant level sensor and properly refill.