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| | | | Joined: Jul 2013 Posts: 20 New Guy | | New Guy Joined: Jul 2013 Posts: 20 | What is the correct psi on the radiator cap for a 1951 gmc 228 I think it's supposed to be 4 psi right now it has a 16 psi cap I have been having an issue every once and awhile with it blowing coolant out the bottom of the radiator some where can't even find out where the coolant is coming from before the thermostat opens and I am stumped any ideas | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | The 228 had a sealed cap. The pressure relief is built into the radiator. It is the round thing protruding from the aft side of the top tank on the left side. It is a 4 psi relief.
On the right aft side of that tank is a petcock. You should fill the radiator until it runs out that petcock. Put more than that in it and you can expect some to puke out the relief valve.
The 16 psi cap will hurt nothing as long as the 4 psi valve is working. | | | | | Joined: Jul 2013 Posts: 20 New Guy | | New Guy Joined: Jul 2013 Posts: 20 | The petcock is on the bottom right side of the radiator but I think I may have thermostat problem as well so I have to figure out where to start
Thanks | | | | | Joined: Jul 2013 Posts: 20 New Guy | | New Guy Joined: Jul 2013 Posts: 20 | The petcock is on the bottom right side of the radiator but I think I may have thermostat problem as well so I have to figure out where to start
Thanks
| | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 |
Does it have a GMC radiator?
| | | | | Joined: Jul 2013 Posts: 20 New Guy | | New Guy Joined: Jul 2013 Posts: 20 | I'm assuming it does but I'm not sure I bought it out of a field two years ago so honestly I don't know | | |
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