At my wits end, motor getting hot. Input please

[lil hoodlum]

Originally Posted by dirtyjim

how old is your radiator?

I just replace it like 2 weeks ago.

Champion all aluminum 3 row core. Part # CC369

[toolboxchev]

Currently with mine, I have also found the vacuum booster is bad. Causing the engine to run rough, but barely noticeable.


I am sure that is not helping the cooling issue. Normally I have 19 inches of vacuum.

The only way I could be positive was by spraying soapy water all over it while the engine was running and having a friend step on the brakes.

[lil hoodlum]

Originally Posted by toolboxchev

Currently with mine, I have also found the vacuum booster is bad. Causing the engine to run rough, but barely noticeable.


I am sure that is not helping the cooling issue. Normally I have 19 inches of vacuum.

The only way I could be positive was by spraying soapy water all over it while the engine was running and having a friend step on the brakes.

Great suggestion. Vacuum leaks

My truck is manual brakes, so no booster. With the motor running, I sprayed starting fluid all around the base of the carburator, vaccuum attatchments, and intake manifold gaskets. No noticeable change of RPMs indicating a leak.

I am not 100% certain to the pressure rating of the new radiator cap. It maybe higher than I think. I say this because a little bit of coolant "weeps" around the chrome water neck and recently oil is coming up past one of the intake manifold bolts. Noticed that on the night the truck got up to 210 degrees.

[lil hoodlum]

Just for good measure, today I am going to install a new 160 degree thermostat. Will test for proper operation prior to installation. If it passes, I am going to drill 4 small holes near the outer diameter of the thermostat as I have read in other threads others have done this.

I will also refill system from the water-neck, not just the radiator part. Maybe there is some massive stubborn air bubble. LOL


Thank you everyone for input and suggestions.


Keith