nagging problem

8

89white50

Member

Nov 16, 2004

440

1

18

central MA

Aug 23, 2006

#1

• Aug 23, 2006

• #1

Well, after changing to 180 thermo, new rad cap, and cutting off the heater core (just connected the two rear hoses) coolant is still pushed out of the overflow after about 150 miles. Pressure just keeps building, and will eventually puked it out. To quickfix it i pull over and let a ****ton of steam out and as soon as the pocket of air is gone the motor sucks all the coolant back in the temp is great...

I was thinking maybe a headgasket has a small pinhole in it, besides that i am out of ideas.

oh my rad only has about 10k on it too...

 

blkcobra50

New Member

Jul 24, 2006

209

0

0

Aug 23, 2006

#2

• Aug 23, 2006

• #2

89white50 said:

Well, after changing to 180 thermo, new rad cap, and cutting off the heater core (just connected the two rear hoses) coolant is still pushed out of the overflow after about 150 miles. Pressure just keeps building, and will eventually puked it out. To quickfix it i pull over and let a ****ton of steam out and as soon as the pocket of air is gone the motor sucks all the coolant back in the temp is great...

I was thinking maybe a headgasket has a small pinhole in it, besides that i am out of ideas.

oh my rad only has about 10k on it too...

Click to expand...

Did the thermostat that you put in have a small hole somewhere on the flat mounting surface around the spring?

 

Strype

Cuthbert catcher

Founding Member

May 11, 1999

61

34

104

Huntsvegas, AL

Aug 23, 2006

#3

• Aug 23, 2006

• #3

My old 86 did that and I never did figure it out

 

8

89white50

Member

Nov 16, 2004

440

1

18

central MA

Aug 23, 2006

#4

• Aug 23, 2006

• #4

lol guys cmon. And i cant remember, i bought a stainless steel one from Steeda. ill be taking it out beginning of next week though.


LOL strype....

 

5.0Droptop

...all those nights we shared, and you're a dude??

Special Agent Mukity-Muck Whats in Charge Round Here

May 15, 2002

1,785

1,130

233

Indiana

Aug 23, 2006

#5

• Aug 23, 2006

• #5

sounds like a head gasket failure. You can get the strips to test if it had exhaust gasses in the coolant.

 

rd

Founding Member

Jan 12, 2000

3,316

63

109

Ocean Springs MS

Aug 23, 2006

#6

• Aug 23, 2006

• #6

The long shot is that you have air in the cooling system somewhere. I had a minor amount of this in the 79 recently, and a quick 20 mile drive at 60+ burped it out, and its been ok since with a 190 tstat, all summer.

Mine eats coolant over the course of a couple months, so when its low, it will overflow when I shut it off. Then I fill it up again. Been like this for 25 years.

However, my best guess is that you have a head gasket going away.

 

8

89white50

Member

Nov 16, 2004

440

1

18

central MA

Aug 23, 2006

#7

• Aug 23, 2006

• #7

man i just did them about 20k ago. I over heated it real bad when the first set went, probably warped a head. guess it will just have to do till i can finish building my 331 this winter/next spring.