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-   -   Help! (https://c10trucks.com/forums/showthread.php?t=3634)

Johnnyb 11-03-2018 03:04 PM

I have a 64 C10 that I did an engine swap. Put in a new 350 SB, Champion 4 core radiator, Flex fan with long water pump. 180 deg thermostat.
Here's my issue, The truck takes forever to warm up enough to open the thermostat and during this time it starts puking coolant from the overflow line. When the truck warms up enough to open the therm it heats up past 180 deg to 200.
I replaced the therm thinking it was stuck open but it's still doing the same thing.
Any ideas? Help me before I pull whats left of my hair out.

cfjfisher 11-03-2018 03:08 PM

there are several possibilities No fan shroud bottom hose collapsing is it a serpentine set up? Maybe water pump for reverse flow

Johnnyb 11-03-2018 03:37 PM

I do not have a shroud. It doesn’t appear that the bottom hose is collapsing. And I have never heard of a reverse flow pump. Could I have put in the incorrect pump?

Johnnyb 11-03-2018 03:51 PM

And no serpentine setup

cfjfisher 11-04-2018 10:02 AM

I'd change the bottom hose to one with a spring in it, and see what happens. The later model Chevys with serpentine belts the water pumps run backwards to the older ones. Just one more thing to think about.

Johnnyb 11-04-2018 08:33 PM

I also deleted the heater. I wonder if that has anything to do with it?

406Rich 11-04-2018 08:48 PM

No on the heater, you say this is a new engine, do you have the paper work with the engine part number, it will tell you if this is a reverse water pump, or did you buy the water pump separate ? One way to tell for sure remove water pump, looking at the front it should rotate clockwise, use a flashlight and look at the impeller vanes, the cupping should be facing clockwise...

Johnnyb 11-05-2018 09:10 AM

I built the engine myself. Its out of a 72 Camaro. The water pump is for that engine and was bought from either Jegs or Summit. I will find the paperwork for the water pump and check the part number and see what it says.
Thanks for the ideas guys.

406Rich 11-06-2018 07:48 AM

To much advance will also have a big impact on over heating, you say you have no shroud, What is the distance from the fan to radiator? Vacuum leaks...?

Johnnyb 11-08-2018 12:03 AM

I am about 12 deg before TDC. No vacuum leaks and the fan is about 3-4” from the radiator.

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