[DML] Re: Cooling System - High Pressure

["Harold McElraft" <hmcelraft@xxxxxxx>]

As the engine warms the pressure will go on up until something blows 
unless you have the proper pressure cap installed that releaves 
excess pressure and then maintains the correct pressure - 15 lbs 
psi. If you just put the tester connection on without a cap you're 
lucky you didn't blow the radiator or heater core. It sounds like 
the system is solid if you kept 14 - 16 lbs for over an hour. I have 
experienced an engine blowing out the antifreeze because of a 
leaking head gasket - I have also seen some GM cooling system 
pelletts stop it. BTW, holding a system pressure as long as you did 
would probably have allowed coolant to leak into the cylinder at the 
head gasket leaking point. The symptom then would be an engine miss 
until the coolant clears in the cylinder. I would be surprised if 
you have a leaking head gasket.

Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, BePositive2000@xxxx wrote:
> 
> 
> Hi, All,
> 
> I'm afraid I have a coolant pressure problem (too high) and am 
hoping
> one of you will have a possible easily fixed cause, other than 
blown
> head gasket.  
> 
> After having the coolant bottle cap blow (on my new SS bottle), I 
put
> a pressure gage on the cooling system.  With engine not running, I
> pressurized the system to 15 psi. It held steady at 14.5 psi for 
over
> 2 hours.  Thought I was home free.
> 
> I then started the car and watched the pressure rise slowly to 20 
psi
> before shutting off the car and doing possible damage.  This does 
not
> seem normal.  My manual does not give much info; however, I may be
> missing pages on this subject.  
> 
> The car sat for 5-6 years before I bought in on e-bay a little 
over a
> year ago.  At that time, I replaced all fuel system components,
> flushed the fuel lines, removed & cleaned the fuel tank, replaced 
all
> coolant hoses, and went thru the brakes.  After clicking the 
starter a
> few times to get the fuel pump to prime the system, the started 
almost
> immediately and seemed to run normally.  However, on my first 
drive,
> the plastic coolant bottle burst at the normal burst point.   A few
> days later, I started a new job and shortly thereafter met a 
special
> lady, so I haven't had time to work on the car again until 
recently.
> 
> Am I being paranoid about the pressure rise?  Should I 
systematically
> remove spark plugs to see of the pressure stabilizes below 14-16 
psi?
> 
> Thanks in advance for your help.
> 
> Woody
> 
> p.s., Yes, I'm still dating the lady!








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