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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: crocha617]
#1643971
07/08/14 12:14 PM
07/08/14 12:14 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Quote:
Now the car runs cool on idle but heats up when driving. The coolant appears to be pressurizing and overflowing out of the radiator.
#1 toss the stat for a day which wont hurt the eng as it might be bad/not opening all the way. Then pump up the rad to 15 lbs when hot & let it sit (overnight if need be) but likely you will see a drop pretty quickly if there's a head gasket issue (especially with your symptoms) & I'm thinking there is. go to a rad shop & have them pump it up with their Stant pump tool right away when hot (make an appt for them to get right on it when you pull up) tho a severe leak will show a psi drop hot or cold or speedway motors has a 1&1/2" 6" metal rad hose extension piece for cheap & drill a hole and add a valve stem and 2 pieces of junk rad hose then sub that in for your top hose & air chuck pump it up to 15 & see what develops. Generally overheating "at speed" is a restricted rad if the stat is good from restricted water flow but like you said it happened after the overheating so unfortunately that sure points to a head gasket and or warped deck/head. Another option is to take off the WP belt and the stat and stat housing & top off the housing to the brim with coolant & start it up & load the eng to heat it up & see if there are any bubbles or the coolant starts rising like a geysey which if there is no combustion leak the coolant should be dead calm. Several minutes max give or take cuz as you know you have zero cooling with the pump disabled. I'd do that check before going to the rad shop as it'd be cheaper/easier for you. EDIT missed that you did a new stat so highly likely it is fine
Last edited by RapidRobert; 07/08/14 12:18 PM.
live every 24 hour block of time like it's your last day on earth
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: crocha617]
#1643973
07/08/14 12:17 PM
07/08/14 12:17 PM
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Joined: Jan 2003
Posts: 15,467
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,467
Omaha Ne
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How hot did it get???? might start with one of these web page 
Last edited by TJP; 07/08/14 12:19 PM.
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: JohnRR]
#1643976
07/08/14 06:35 PM
07/08/14 06:35 PM
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Joined: Feb 2007
Posts: 1,687
Boston, MA
crocha617
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Boston, MA
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Quote:
If you have a working radiator cap the cooling system is going to pressurize , but you knew that already 
Yeah but would coolant start blowing out between the upper radiator hose and the thermostat housing & continously pour out of the overflow? Also heard a hissing out of the passenger side exhaust manifold head area....
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: fastmark]
#1643980
07/09/14 11:08 AM
07/09/14 11:08 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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If you have an emissions testing station up there in your area you could have them stick the tailpipe probe in the dead air space below the rad cap & any hydrocarbons (a combustion leak) will show right up on their meter with it idling (power brake it to load it)
live every 24 hour block of time like it's your last day on earth
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: crocha617]
#1643982
07/09/14 11:35 AM
07/09/14 11:35 AM
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Joined: Jan 2003
Posts: 75,080
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,080
U.S.S.A.
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Quote:
Quote:
If you have a working radiator cap the cooling system is going to pressurize , but you knew that already
Yeah but would coolant start blowing out between the upper radiator hose and the thermostat housing & continously pour out of the overflow? Also heard a hissing out of the passenger side exhaust manifold head area....
The coolant coming out between the rad hose and the thermo housing is what is called a LEAK ... system can't hold pressure if it's leaking ... but you knew that . What king of clamp are you using ?
As far as it coming out of the overflow , that can be happening for one of two reasons , first you are over pressurized because it's overheating .... second is you have a cap designed for use with a coolant recovery system so it's doing exactly what it's supposed to be doing ... but you knew that too.
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: 70gtx440dana]
#1643983
07/09/14 06:31 PM
07/09/14 06:31 PM
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Joined: Feb 2007
Posts: 1,687
Boston, MA
crocha617
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Quote:
Quote:
My 440 in my Cuda got hot once while Idling when I first put the car together a few weeks ago. I believe it was probably either the 45 year radiator or the lower hose that was soft and ended up having a very small spring in it. I installed a new aluminum radiator, a new lower hose, a water pump, and a new 180 degree thermostat. Now the car runs cool on idle but heats up when driving. The coolant appears to be pressurizing and overflowing out of the radiator. The engine is also not running as well as it used to and there sounds like an exhaust leak on the passenger side now. I was going to do a compression test next but I assume at a minimum I blew the head gasket when it heated up the first time. Any other suggestions or theories will be appreciated.
Just a thought.....are you sure you are running the correct water pump and pulley set-up. If you are running an non a/c style pump with an a/c pulley you could be creating cavitation in your system causing an over heat condition.
Joe I think you could be onto something there. When I ordered the pump I said AC but they looked different. I think the new one I installed had 8 small blades vs. 6 large blades. BUT the situation existed before I installed the new water pump.
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: JohnRR]
#1643984
07/09/14 06:36 PM
07/09/14 06:36 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
Quote:
Quote:
If you have a working radiator cap the cooling system is going to pressurize , but you knew that already
Yeah but would coolant start blowing out between the upper radiator hose and the thermostat housing & continously pour out of the overflow? Also heard a hissing out of the passenger side exhaust manifold head area....
The coolant coming out between the rad hose and the thermo housing is what is called a LEAK ... system can't hold pressure if it's leaking ... but you knew that . What king of clamp are you using ?
As far as it coming out of the overflow , that can be happening for one of two reasons , first you are over pressurized because it's overheating .... second is you have a cap designed for use with a coolant recovery system so it's doing exactly what it's supposed to be doing ... but you knew that too.
 love it! anyway, assuming the cap is correct, is it also 45 years old? what PSI is it? if it's shot it could be opening under too little pressure or the reverse of that, putting the system under too much pressure....
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: JohnRR]
#1643985
07/09/14 06:42 PM
07/09/14 06:42 PM
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Joined: Feb 2007
Posts: 1,687
Boston, MA
crocha617
OP
top fuel
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OP
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Boston, MA
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Quote:
Quote:
Quote:
If you have a working radiator cap the cooling system is going to pressurize , but you knew that already
Yeah but would coolant start blowing out between the upper radiator hose and the thermostat housing & continously pour out of the overflow? Also heard a hissing out of the passenger side exhaust manifold head area....
The coolant coming out between the rad hose and the thermo housing is what is called a LEAK ... system can't hold pressure if it's leaking ... but you knew that . What king of clamp are you using ?
As far as it coming out of the overflow , that can be happening for one of two reasons , first you are over pressurized because it's overheating .... second is you have a cap designed for use with a coolant recovery system so it's doing exactly what it's supposed to be doing ... but you knew that too.
I checked the hoses last night and tightened everything again I actually ordered an overflow bottom last night from the radiator people so that issue may be resolved. Even if it is the radiator recovery bottle the car still runs like crap compared to how it ran originally. I may run it one more time tonight and check it all out again now that I had time to calm down.
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: floridian]
#1643987
07/10/14 12:05 PM
07/10/14 12:05 PM
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Joined: Jan 2003
Posts: 75,080
U.S.S.A.
JohnRR
I Win
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I Win
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U.S.S.A.
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Quote:
Isn't this the part of the US where Ted Kennedy kept getting reelected?........
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Re: 1969 440 HP Overheating or Coolant Pressurizing ???
[Re: floridian]
#1643989
07/15/14 04:03 PM
07/15/14 04:03 PM
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Joined: Feb 2007
Posts: 1,687
Boston, MA
crocha617
OP
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Quote:
Am I reading this correctly??
You had a fresh rebuild ( or a new motor) you installed in a car without having the radiator flushed checked, you reused your "old soft hoses", old water pump,old thermostat etc????
Isn't this the part of the US where Ted Kennedy kept getting reelected?........
NO you're not reading it correctly. It was a transplant from another car. The other car ran and drove perfectly and was rebuilt about 10,000 miles ago. I was perfect the morning of the transplant. Nothing was changed but the exhaust manifolds. The radiator hoses were never even taken off the engine. The radiator from the donor car was used temporarily in the new body. That is the baffling part. NOTHING changed except the car it was sitting in. I will post an update when I have time to mess with it. The only thing I did was install the over flow bottle I haven't really had time to do anything else with it yet.
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