Overheating issue

[67 cst swb]

You have the arrows running in the incorrect direction. Reverse the direction of the arrows.
The water pump... pumps water out of the engine into the radiator thru the bottom hose.
The water flows out of the radiator thru the top hose back into the engine.

[litew8]

Originally Posted by 67 cst swb

You have the arrows running in the incorrect direction. Reverse the direction of the arrows.
The water pump... pumps water out of the engine into the radiator thru the bottom hose.
The water flows out of the radiator thru the top hose back into the engine.

Sure about that?

[seattle gmc]

Originally Posted by 67 cst swb

You have the arrows running in the incorrect direction. Reverse the direction of the arrows.
The water pump... pumps water out of the engine into the radiator thru the bottom hose.
The water flows out of the radiator thru the top hose back into the engine.

I disagree with your statment. My lower radiator hose has wire running through it to keep it from colapsing, from that "water sucker" pumping coolant through the engine.

[myyamr7]

Originally Posted by 67 cst swb

You have the arrows running in the incorrect direction. Reverse the direction of the arrows.
The water pump... pumps water out of the engine into the radiator thru the bottom hose.
The water flows out of the radiator thru the top hose back into the engine.

You're wrong! And it's simple to prove yourself wrong by removing your radiator cap, start the engine and let it warm up so the t-stat opens, and you will clearly see the direction of flow. As mentioned in this thread, there's a reason the lower hose has a coil wire inside it...and it's not there to add minerals to your coolant

[litew8]

The top hose should be empty when the thermostat is closed. When the thermostat OPENS, the pressure maintained/created by the water pump forces the heated coolant to pass by the thermostat (via engine) and enters into the radiator through the top hose -thereby causing the cooled coolant previously in the radiator to enter the engine via the bottom hose. When that cool coolant enters the engine, the thermostat recognizes and closes - allowing the newly heated coolant in the radiator to cool. Rinse, repeat.

[67 chevelle]

Picture is worth a thousand words , YOU NEED A SHROUD , will solve your problem

[litew8]

Originally Posted by 67 chevelle

Picture is worth a thousand words , YOU NEED A SHROUD , will solve your problem

Not sure it's the root cause but should definitely help.

[special-K]

Originally Posted by 67 chevelle

Picture is worth a thousand words , YOU NEED A SHROUD , will solve your problem

I doubt that,since all 67-72 L6s came from GM without a shroud.

[litew8]

Here's one on 60-66's, but he's got A/C and it's a 66. This is what I imagined it might look like, but I guess it was only for trucks (66 only?) equipped with a/c. Strange GM would eliminate the shroud, it looks dangerous without.

[special-K]

Originally Posted by litew8

Strange GM would eliminate the shroud, it looks dangerous without.

There is a metal finger shield mounted

[Z10]

Originally Posted by 67 chevelle

Picture is worth a thousand words , YOU NEED A SHROUD , will solve your problem

You need a shroud. You're only pulling air through the radiator in front of the fan. A shroud will pull air through all of the radiator.

[sjburk]

Sorry, I had my truck in the shop welding in some new panels for quite some time. I got it back yesterday and bought an IR thermometer. I let the truck idle in the driveway, the needle went all the way to the hot side, I revved it up and it went back down and leveled at about 3/4 of the way at a steady idle. When the tsat got to around 185 the hose going to the radiator did get hotter. My temps when everything leveled out were, sending unit in head 250, head 250, block 225, tstat housing 230, tstat rad hose 175, water pump rad hose 150, incoming side of radiator 180, rest of radiator 100. That actually sounds reasonable to me, but please tell me your thoughts. Now I'm thinking the gauge or sending unit is off on readings. Thanks for your patience.

[litew8]

Auto Meter Mechanical Temp Gauge Installation -...

[slikside]

Originally Posted by myyamr7

You're wrong! And it's simple to prove yourself wrong by removing your radiator cap, start the engine and let it warm up so the t-stat opens, and you will clearly see the direction of flow. As mentioned in this thread, there's a reason the lower hose has a coil wire inside it...and it's not there to add minerals to your coolant

You can also just put your hand on the upper hose when the thermostat opens. If the motor was cold when you first started it, you can actually feel the hot coolant running FROM the engine block through the upper hose and into the radiator.

[Ridgeclimber]

Originally Posted by 67 cst swb

You have the arrows running in the incorrect direction. Reverse the direction of the arrows.
The water pump... pumps water out of the engine into the radiator thru the bottom hose.
The water flows out of the radiator thru the top hose back into the engine.

This last quote is incorrect. The picture with the arrows was correct.

[imjeff]

Originally Posted by 67 cst swb

You have the arrows running in the incorrect direction. Reverse the direction of the arrows.
The water pump... pumps water out of the engine into the radiator thru the bottom hose.
The water flows out of the radiator thru the top hose back into the engine.

Nope. I'm pretty sure it's the other way. That's why there's a spring in the bottom (suction side). Hot water goes in the top and cooler pulled off the bottom.

Jeff