1969 RR 383 Over Heating

[Jeff 69]

I have a 69 Road Runner with a 383 motor. It always over heats about 10 min. after the motor running. Does a blown head gasket act that way? I took the rad cap off and also run the motor,out came the water again. The water was not hot to the touch. I can not find the problem.Would love to drive my car. Also it has a new thermostat. Thank you Jeff
I have no leaks that I see

 

[RustyRatRod]

Are you 100% sure the "new" thermostat is opening properly?

 

[69redrunner]

X 2 on the stat..
Also, with the cap off and engine running, can you see coolant flowing in the radiator? Could be a weak or worn water pump or a stuck t-stat.
Are the hearter hoses warm? any heat to the interior?

 

[Jeff 69]

Hello No heat on the hoses. Did not see any water moving in rad, did not have time to look. Also I did check the t-stat if opening ok. I put in hot water and you could see it open . You guys think it could be th water pump ? Would be ok to take the t-stat out and run the motor and see what happens ?

 

[70RR]

Overheating

X3...HEATER HOSES NOT HOT, WATER NOT HOT... IS SEE NOTHING ELSE LEFT BESIDES YOUR WATER PUMP...I HAD SIMILAR ISSUES WITH MY 69 RR AND IT WAS THE PUMP.
:sunny:

X 2 on the stat..
Also, with the cap off and engine running, can you see coolant flowing in the radiator? Could be a weak or worn water pump or a stuck t-stat.
Are the hearter hoses warm? any heat to the interior?

 

[tpodwdog]

if you see bubbles in the radiator...thats a blown head gasket. if the t-stat is opening....the prob is a clogged radiator. get a new one! my 70 RR did the exact same thing....a new 26" champion rad fixxed the problem!

 

[67 coronet]

if it is as bad as you say i would pull both rad hoses and take a garden hose and put it in the top spot to check flow through the rad.look inside the hose connection and check for buildup as well.

 

[Jeff 69]

Thank you all for the info. I will start with the garden hose,if that is ok I will go to the water pump.I will get a new rad a my last point. ( most money ). Now I have more places to look at and try.

Thanks again Jeff

 

[Dennis H]

I have had good luck with copper radiator, green coolant, clutch fan, 180 Napa SuperStat and factory shroud.

 

[69redrunner]

Yes, you can run it without the t-stat installed. Doing so may help to diagnose your problem. Without the t-stat, you should see water moving in the rad as the water pump should be circulating it. ( A stuck t-stat will prevent block the flow) If you still see no flow without the stat, look @ the pump and/or rad. If you see flow with no stat, you probably have a bad stat.

 

[red 69 runner]

If you just replaced the thermostat you may have air that needs to be burped out.

 

[Jeff 69]

Thanks for all the input. It turned out to be the water pump !! But all the info was super .. again thanks to you all.

 

[coloradodave]

What was wrong with it?