Thread: 64 C10 w/350 running hot

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I am assuming the water and steam boiling out of the overflow confirms the guage reading.

Have you tried a new radiator cap? If it's bad it will not maintain pressure which will cause overheating.
What kind of shroud do you have? If any? A good shroud with a good clutch fan is the probably the way to go...
Mark

Originally Posted by astroracer

Have you tried a new radiator cap? If it's bad it will not maintain pressure which will cause overheating.
What kind of shroud do you have? If any? A good shroud with a good clutch fan is the probably the way to go...
Mark

If its boiling out at 220, then you are not maintaining pressure....

Do you have a shroud on it? How about the filler panel from the top of the rad to the grille support? Without that piece, hot air recirculates over top of the rad and back through it. I've seen big blocks in those old trucks with stock, 283 rads with no cooling problems.
Is the truck slammed? Sometimes if they're really low the air can't get out of the boiler room.
If you need a new rad anyway, get the biggest one that'll fit. A GM diesel pickup rad will cool it, if it'll go in there.

if your cap is good get another radiator. buy one of those generic fit radiators from mail order. they are fairly cheap.