I have an after market power steering/oil cooler on my 1968 Barracuda. It is mounted to the front of the AC condenser.
Prior to installing the cooler, the laser temp gauge (Craftsman) would read in the 235 degree range at the front hub of the PS unit. The oil inside the .94 Saginaw reservoir would read around 215 to 220. One day, the return power steering line popped off of the power steering unit. Hot oil went everywhere.
After installing the PS oil cooler (I think it is a Hayden), the PS pump hub runs around 180 or so and the oil runs around 175 or so. The return line has not popped off since.
Buy a laser temp sensor and see how hot the power steering hub is and how hot the PS fluid is and make your decision based on that.
Hayden oil cooler:
http://www.oreillyauto.com/site/c/detail...6&ppt=C0031Photo is a factory PS cooler that came on a 1969 GTX.
