Water Pressure in Radiator - Pontiac GTO Forum
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post #1 of 2 (permalink) Old 01-08-2019, 05:56 AM Thread Starter
 
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Water Pressure in Radiator

So...im not Mechanic but try my best to do as much as i can by myself...Theres the Problem:

I bought a 65 in Dezember 2017, when i was there to look at the car i popped the Hood and opened the Radiator Cap...Boom...the car was Cold but there was A LOT of Pressure in it.

Didn`t mind...bought the Car, drove it the whole last Year. Temperature was never higher than 190 F ( I got an Aluminium Radiator and a Big and two small Electric Fans).


A few Days ago i opened the Radiator Cap and the Same Thing happened. A lot of Pressure in the Radiator. Now i checked the Termostate, this one is completely Stuck.

Now could this be the only Reason? Heard thet a bad Head Gasket could cause this Problem too...but the Car runs perfect and i don`t have any Water in Oil.
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post #2 of 2 (permalink) Old 01-08-2019, 08:20 AM
 
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Originally Posted by ManuelB View Post
So...im not Mechanic but try my best to do as much as i can by myself...Theres the Problem:

I bought a 65 in Dezember 2017, when i was there to look at the car i popped the Hood and opened the Radiator Cap...Boom...the car was Cold but there was A LOT of Pressure in it.

Didn`t mind...bought the Car, drove it the whole last Year. Temperature was never higher than 190 F ( I got an Aluminium Radiator and a Big and two small Electric Fans).


A few Days ago i opened the Radiator Cap and the Same Thing happened. A lot of Pressure in the Radiator. Now i checked the Termostate, this one is completely Stuck.

Now could this be the only Reason? Heard thet a bad Head Gasket could cause this Problem too...but the Car runs perfect and i don`t have any Water in Oil.
Remove the thermostat or replace with a working 160 - 180* (you choose) and you should find you are fine.....

1965 GTO Convertible 3 speed tri-power drum brakes originally

Current setup:
400 cu in with tri-power
4 speed Muncie
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