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Author
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Topic: sudden overheating
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65stang289
Journeyman Posts: 50
From: concord (bay area), ca
Registered: Dec 2003
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posted 03-31-2005 02:20 PM
   
Hey everyone, my poor stock 289 in my 65 coupe has been acting up. After it warms up and runs for about 5-10 minutes and is at normal temperature, the temperature will suddenly sky rocket (within 1 or 2 seconds) all the way to the H on my stock temp gauge, huge amounts of pressure will shoot into my radiatior forcing all of the coolant into my overflow resevior, which then just starts pooring out because its not big enough. The coolant within the resevoir is extremely hot and is boiling. I can hear something almost knocking around in the radiator (like the pressure is just throwing coolant around in bursts. All the hoses become incredibly hot, and its obvious that the thermostat is wide open. I'm not exactly sure what is wrong, it has disabled me from driving me car. I have put in a new radiator, thermostat, radiator cap, flushed and put new coolant in. I did all this after the first time it happened. Soemtimes it seems like all the air gets into my system and builds pressure, but how? I filled the coolant properly. Please help me figure out what is wrong with my stang. And please don't tell me its a broken head gasket. Thanks a lot and sorry for the long post.
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 03-31-2005 03:06 PM
First thing first!
Buy or borrow (many chain parts stores loan or rent them) a colling system pressure tester.
Pump it up and that will tell us all if you have a blown gasket, cracked head, or block.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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65stang289
Journeyman Posts: 50
From: concord (bay area), ca
Registered: Dec 2003
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posted 03-31-2005 07:15 PM
I got the tester and tested it. I had no leaking at all. I returned it and talked to one of the guys there about my situation. He told me it still could be a blown head gasket or a leaking cylinder head. Anyone elses thoughts? I really don't wanna do a head gasket job. Thanks.
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DidgeyTrucker
Gearhead Posts: 1190
From: Greenbrier, TN USA
Registered: Oct 99
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posted 03-31-2005 08:06 PM
My first thought is you're gonna have to get somebody else to do a head gasket job. That's where the pressure and knocking is coming from.Tracy
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74merc
Gearhead Posts: 1006
From: Demopolis AL
Registered: Jun 99
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posted 03-31-2005 08:09 PM
It does sound like something cracked or lost a head gasket.Lots of times standard pressure for cooling systems won't leak, but the pressure of running or even after it warms to operating temp can cause it to leak. a buddy of mine has something to test for exhaust gases in the coolant. I'd find one of those before pulling down the engine if there was any question... [This message has been edited by 74merc (edited 03-31-2005).]
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 03-31-2005 08:37 PM
Did you use a tester that installs on the radiator?
Did you test it with the engine running?
How high did you pump it up?
How long did it hold pressure?
If it held pressure with the engine hot there is no blown head gasket.
Did you by any chance recently rebuild the engine or the heads?------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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exlocal
Gearhead Posts: 205
From: hacienda hts., CA, USA
Registered: Dec 2004
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posted 03-31-2005 11:19 PM
Very basic stuff, but, is any of the hoses, upper/lower soft and spongy? They may collapse causing those symptoms, not allowing coolant to circulate properly. Another long shot is the intake manifold gaskets near the coolant passages. Good luck.------------------
reliving youth
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65stang289
Journeyman Posts: 50
From: concord (bay area), ca
Registered: Dec 2003
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posted 04-02-2005 04:31 PM
Did you use a tester that installs on the radiator?
yes
Did you test it with the engine running?
yes
How high did you pump it up?
13lbs
How long did it hold pressure? as long as
If it held pressure with the engine hot there is no blown head gasket.
it holds pressure, but the pressure rises rapidly.
Did you by any chance recently rebuild the engine or the heads?
the engine has 35k on it sense the rebuild. I let it do it again, this time with the cap off and keeping my distance. The coolant is fine for a while then I eventually see bubbles in the coolant as its rising rapidy, and finally out of nowhere all this pressure shoots out all the coolant in my system. This happens whither I turn the car off or not before the huge amount of pressure shoots the coolant. It still happens with the new thermostat in or not, the water pump is only 6 months old, and the radiator is new. Thanks a lot for your help. Help me fix this thing!
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DidgeyTrucker
Gearhead Posts: 1190
From: Greenbrier, TN USA
Registered: Oct 99
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posted 04-02-2005 04:37 PM
Did it start after you replaced the water pump? You might have a reverse rotation pump meant for serpentine belt applications.Tracy
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65stang289
Journeyman Posts: 50
From: concord (bay area), ca
Registered: Dec 2003
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posted 04-02-2005 07:36 PM
The water pump is fine, it ran perfectly well with the car for the last 6 months. I just did a block test to see if there are any vapors in my coolant and it said there are no vapors (combustion vapors)present, which would rule out the possibility of a head gasket, right? One thing I didn't mention is that this problem occured after I did my auto to t-5 swap, but I can't think of anything from that swap that would do this. Thanks a lot.
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 04-02-2005 07:53 PM
Is the water circulating for sure?
Have you looked in the radiator with the cap off while running?------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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65stang289
Journeyman Posts: 50
From: concord (bay area), ca
Registered: Dec 2003
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posted 04-02-2005 07:59 PM
yup, this thing is driving me crazy.
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DidgeyTrucker
Gearhead Posts: 1190
From: Greenbrier, TN USA
Registered: Oct 99
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posted 04-02-2005 08:35 PM
Us too. It should run cooler now that you've gotten the automatic transmission fluid out of the cooler in the bottom of the radiator. You have changed radiators, right? You said it started over-heating and then you changed radiators?What all did you work on when you changed the transmission? Tracy
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65stang289
Journeyman Posts: 50
From: concord (bay area), ca
Registered: Dec 2003
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posted 04-02-2005 11:16 PM
I did not touch anything in the cooling system besides take out the cooling lines for the auto tranny. I was wondering if anything in the intake would cause this. I did remember to plug the vacuum, and I didn't see anything else. Thanks for sticking with me.
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