13 or 16psi cap?

[Amopower]

I just replaced all the components of the heating system in a 93 XLT. I have the choice of using a 13 or 16psi cap. It seems that 16psi is the motorcraft one currently available, but the other brands are 13. However, the original is 13psi motorcraft. I found a 13 on ebay and have it, as well as the 16. just not sure which one to use? Factory shop manual says 13 is typical, 16 is max.

 

[Maniak]

We run 16psi on our X and have for many years and thousands of miles.

Each 1 PSI raises the boiling point 3 degrees F. That means a 16psi cap will raise the boiling point of your coolant 9f more than the 13psi cap.

With the 13psi cap the X would sometimes boil over with the heat soak. Switched to the 16psi cap and it doesn't happen now..

~Mark

 

[fordnut71]

id put a 16# cap on also