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Unread 11-27-2006   #1 (permalink)
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Default 5.0 water flow direction....

Engines cooling systems acting odd, somewhat like a blown head gasket, yeat no water/steam seen in exhaust, and none in oil.
Im wondering the direction of water flow. By looking at the pump and the fan direction, Im thinking the water goes IN at the intake and pumps out from the waterpump, pushing the water UP through the radiator.
If this is correct, Im thinking a thermostate stuck closed may be the problem.
Its pushing water out the overflow, so its eather that or a head gasket causing the pressure.
The temp goes fine then spikes and then sometimes drops off weird.

So basically what way is the flow?
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Unread 11-27-2006   #2 (permalink)
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In mine it runs from the water pump to the top of the radiator. So it pushes in the top and it flows down through the radiator. just did a flush a week or so ago, so I know this for sure.

as a side note, I think it has to go that way, so that the water heats up in the motor, then the thermostat opens, lettin the hot water flow to the radiator, to get the proper temperature.
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Unread 11-27-2006   #3 (permalink)
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NOTE:
this engines in a BroncoII, and with this setup the radiator cap is inline in the upper hose.
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Unread 11-28-2006   #4 (permalink)
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There are two different types of waterpumps too. Standard rotation, which is typical with V-belts (it's driven by the inside of the belt), and reverse rotation, with the serpantine setup - it's driven by the outside of the belt - hence, in reverse.
I think it flows out of the engine, through the upper hose, (once the 'stat opens) through the rad, and out to the waterpump, which circulates it through the engine. There's also the 90 bypass hose which is always circulating.
Make sure you have the proper waterpump for your belt setup.
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Unread 11-28-2006   #5 (permalink)
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ohh i didn't realize that. nice call.... guess thats why you're a senior member..
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Unread 11-28-2006   #6 (permalink)
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Iv been running this for years with the same pump and no problems.
By looking at the waterpump I cant see how the water cant be coming OUT the lower hose, and into the intake. If this is right, a stuck t-stat would pressurize the upper hose causing the overflow to release the pressure....
What eer happened to the OLD manuals that showed these kind of details....
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Unread 11-28-2006   #7 (permalink)
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You're prolly right, seein how it is your car, and you should know it better than anyone ... I'd just change the thermostat, they are only a few bucks, and about half an hour-tops- to change.

I sure miss those old manuals too. Hard to come by. I had one for my 64 fairlane, that had intimate details, man that thing was handy- heavy too though.
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Unread 11-29-2006   #8 (permalink)
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Quote:
Originally Posted by mybronco2.com
Iv been running this for years with the same pump and no problems.
By looking at the waterpump I cant see how the water cant be coming OUT the lower hose, and into the intake. If this is right, a stuck t-stat would pressurize the upper hose causing the overflow to release the pressure....
What eer happened to the OLD manuals that showed these kind of details....
a sticking thermostat will pressurize the upper hose. im pretty sure the flow is as stated before, starting at the waterpump, into the upper hose, down through the radiator, in the lower hose, back into the pump, through the block and manifold, and heads, then ends at the thermostat. when it opens, it recirculates. the heater core lines are the small bypasses on the side of the pump.

are you running the V belt setup on the BII or are all the front accessories from the stang you got the 5.0 from?
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Unread 11-30-2006   #9 (permalink)
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The engine and everything bolted to it are off a '88 Mustang...well ok everything on the front of the engine is.
guess once the snows gone, I will try a idea I had....
a foot or two of thread dropped into the fill in the upper hose will tell me what way its going....with me holding the other end of course.
If you look at the waterpump, and being the hose clamps on below center and the counter clockwise direction of the fan, I dont see how the water could come in at the bottom, but maybe there is something my brain dont wanna see...DAMN BRAIN
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Unread 12-04-2006   #10 (permalink)
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Quote:
Originally Posted by lxarlo
a sticking thermostat will pressurize the upper hose.

Does everyone agree that a sticky thermostat WILL lead to abnormal upper hose pressure?
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Unread 12-04-2006   #11 (permalink)
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I think it would pressurize the rest of the cooling system as well.
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Unread 12-05-2006   #12 (permalink)
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a stuck open thermostat will pressurize the upper hose because its not supposed to be open when its cold. when you first start the car, there will be immediate pressure throughout the cooling system.
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Unread 12-05-2006   #13 (permalink)
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If its stuck anything its stuck closed, not opened...

Again the fill cap is INLINE in the upper nose.
It pushes out water cold or warm, but isnt acting anything like a head gasket, other then the pressure in the upper hose.
Last I drove it, the temp went way up as it did the time before that, but last time it suddenly dropped off to a normal temp, leading me to beleave the t-stat was stuck closed, so not to let the water curculate.
IF the water flows INTO the intake, and the t-stat was stuck CLOSED, that would cause higher then normal pressure in upper hose and would explane EVERYTHING.
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1984 BroncoII

327 HO stroker (331 w/std. bore), AFR Heads, Ported Cobra Intake, BBK 70mm TB, 30 lbs Injectors, 255 lph fuel pump, Nitrous, C4 Automatic Trans, Dana 20 Transfer case, D35 front TTB, w/ARB, 8.8" rear - 4.56 Gears, 32x10.5 Swampers, 3" lift, Safari Snorkel
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