Heater Core - 1987 Mustang

Fox Body restorers seeking Ford factory heat must target the 1987-1993 HVAC ecosystem specifically. The service number E7ZZ-18476-A (superseded by F0ZZ-18476-A) fits all 5.0L E7TE and 2.3L variants from the dashboard-redesign year forward. When hunting junkyards, prioritize 1984-1992 Lincoln Mark VII LSCs sharing the Fox platform—these often contain heavy-duty brass heater cores that outlast stock Mustang aluminum units. Inspection demands checking the tube-to-header solder joints for the telltale green crust of electrolysis or seepage at the firewall grommet. Installation requires complete HVAC box removal; proactive mechanics replace the plenum seals and vacuum actuators while accessible. Critical distinction: 1979-1986 Mustangs utilize a different core geometry due to pre-facelift dash architecture. Always verify the tube exit angle matches your firewall cutout before purchase.