1 We were lucky, PSA's radiator had been replaced with a four-core copper/brass radiator in the past. The original fan shroud was broken up and most of it was missing. Most likely that's why PSA's original engine went into meltdown. We left the copper/brass radiator in until we had the new engine ready to install. No use contaminating the new Dewitts radiator. The new plan was to install electric fans with the new radiator.