Do radiators on all BB leak antifreeze???

[jims427400]

Whenever I park my BB after driving it for a short time in 80 deg.heat, my radiator leaks antifreeze out the overflow. Is this normal and why dosent my car have an overflow like some cars I've seen.

 

[Sting Ray]

My guess is that you have too much fluid in there, do you keep adding after it pukes?

Tom M

 

[jims427400]

No, last time I checked it down about 3 inches from top. Did someone eliminate my overflow tank or did they not exist on 67 427s? thanks Sting Ray..

 

[Sting Ray]

There isn't an overflow tanks on Any midyear bigblocks except the '65 and the L-88, What is the temperature that your car is running at normally?

Tom M

 

[jims427400]

Best I can tell approx. 170. Does that seem low?

 

[Sting Ray]

Yes,

Do you know what you have for a thermostat?

Tom

 

[jims427400]

Tom,
No I dont . Guess I'll pull it out tomarrow and replace w/ new one. Do you think thats the problem? Whats normal running temp? Thanks again Tom

 

[Sting Ray]

Mine runs between 190 and 210 most of the time, you might have to high a thermostat, in there and it isn't opening if this is just a short trip, then it is boiling over when you get home from the heat soak.

Tom

 

[jims427400]

Thanks Tom. Can you tell me what temp. thermastat your running. I also wonder if my gauge is reading correctly, but wouldnt explain the boil over. I bet your rite about thermostat.I'll keepyou posted. Again, thanks for your help.. Jim

 

[JohnZ]

Puking out the overflow hose during heat-soak after shutdown isn't unusual (the coolant is still absorbing engine heat and isn't being circulated through the radiator, and "hot-spots" form, causing it to boil locally). Two things usually cause this - an over-filled radiator, or a radiator cap with a bad seal or spring. Don't keep topping up the radiator - check it COLD to the "Full Cold" embossment on the side tank and leave it alone; that provides space for it to expand during operation and heat-soak without being pushed out of the overflow hose. Have your cap checked to make sure it's still sealing at its rated pressure; a 50-50 mix of coolant (check your concentration) won't boil until 265*F when it's under 15 pounds pressure.