[Fot] Radiator Caps

[Larry Young]

It's even easier if you've got a compressor with a pressure regulator.  
Just adjust the pressure up until the cap opens.

Randall wrote:
>> Any ideas as to how much the spring should be compressed to 
>> hold the pressure?
>>     
>
> What I did was to remove the plug where the heater valve used to be, and
> temporarily put in a pipe tee with a Schrader valve on one leg and a hose
> barb on the other.  To the hose barb I connected my vacuum test gauge (which
> also reads pressure to 10 psi).  Pressurize the system with an air hose
> through the Schrader valve, then watch what the gauge does (and where the
> air/water comes out).