Pushing water out of radiator?

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Pushing water out of radiator?

Post  capncruncher1965 on February 16th 2018, 6:31 pm

Guys have a brand new 545 in a 96 mustang and its got a alluim raditor it keeps pushing water out bad with the cap off. Water will go up then down then start shooting out the top. Did the same thing with the 466 in it. This motor is all new water pump is manual.factory electric fan and shroud. Thermostat is gutted out. We just cant figure it out. Thanks
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Re: Pushing water out of radiator?

Post  STR-LGL-70 on February 16th 2018, 7:42 pm

Have you done a compression test?
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Not yet

Post  capncruncher1965 on February 16th 2018, 8:32 pm

Not yet motor runs great but we are going to check the cylinder pressure tomorrow.
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Re: Pushing water out of radiator?

Post  stanger68 on February 16th 2018, 9:16 pm

What pressure cap?

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Re: Pushing water out of radiator?

Post  cletus66 on February 16th 2018, 9:58 pm

Put the cap back on and watch the temp.
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Re: Pushing water out of radiator?

Post  rmk57 on February 16th 2018, 10:17 pm

Could be the top hose is higher than the radiator trapping air. That can cause all sorts of problems.

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Re: Pushing water out of radiator?

Post  cletus66 on February 16th 2018, 11:44 pm

rmk57 wrote:Could be the top hose is higher than the radiator trapping air. That can cause all sorts of problems.




You are correct. When I filled my 460 powered 81 Mustang's radiator up, I jacked the front end way up to get the air out, and then I never took the radiator cap off again....seriously, I should probably look in there once in a while...

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Re: Pushing water out of radiator?

Post  stanger68 on February 17th 2018, 12:54 am

Sorry I missed the cap off part.

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16lbs cap

Post  capncruncher1965 on February 17th 2018, 5:35 am

The engine is higher than the top of the radiator. Did not think about that but there's no way to raise the radiator up any higher. Anything we can do to compensate this?
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Old motor same problem

Post  capncruncher1965 on February 17th 2018, 5:39 am

Other motor did have a blowed head gasket. Pretty sure this one does not its not got over 200 degrees
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Re: Pushing water out of radiator?

Post  jasonf on February 17th 2018, 9:27 am

capncruncher1965 wrote:The engine is higher than the top of the radiator. Did not think about that but there's no way to raise the radiator up any higher. Anything we can do to compensate this?

Can you fit a remote radiator cap in the upper hose?

https://www.google.com/search?q=remote+radiator+cap&rlz=1C1CHZL_enUS748CA748&oq=remote+radiator+cap&aqs=chrome..69i57.4174j0j7&sourceid=chrome&ie=UTF-8
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Re: Pushing water out of radiator?

Post  BOSS 429 on February 17th 2018, 1:42 pm

capncruncher1965 wrote:Guys have a brand new 545 in a 96 mustang and its got a alluim raditor it keeps pushing water out bad with the cap off. Water will go up then down then start shooting out the top. Did the same thing with the 466 in it. This motor is all new water pump is  manual.factory electric fan and shroud. Thermostat is gutted out. We just cant figure it out. Thanks


if its a hi flow pump it does push water out with cap off, whats it do with the cap ON?


one of MINES A GUSHER with the cap off, also depends on how the rad was made,and where the cap location is
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Re: Pushing water out of radiator?

Post  rmk57 on February 17th 2018, 1:51 pm

jasonf may have a solution, I'd try it anyway. I know the early 60's FE Galaxies had a surge / expansion tank from the factory for the same problem your having.

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Re: Pushing water out of radiator?

Post  rmcomprandy on February 17th 2018, 3:32 pm

capncruncher1965 wrote:Guys have a brand new 545 in a 96 mustang and its got a alluim raditor it keeps pushing water out bad with the cap off. Water will go up then down then start shooting out the top. Did the same thing with the 466 in it. This motor is all new water pump is  manual.factory electric fan and shroud. Thermostat is gutted out. We just cant figure it out. Thanks

I hope for your sake, it is something simple.

It could be combustion pressure migrating into the water jacket, if there is a porous place anywhere within an area which sees cylinder presure.

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High flo pump

Post  capncruncher1965 on February 17th 2018, 7:16 pm

Thats our problem. Pump is high flo dam didn't think about that.going to run it some tomorrow will give a update tomorrow night. Really want to thank all you guys for trying to help us out.Best dam website ever!!!!
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Got it fixed

Post  capncruncher1965 on February 19th 2018, 8:01 pm

Finally got it fixed. Took out the AC condenser got the fan on high speed filled it with water dam thing ran cool. Thanks guys for all your replys.
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