Follow the upper radiator hose back to the engine, that is were the stat is. If it is a 4.0 engine as my 90 is, it should have 3 10mm headed bolts on the housing and a o-ring for a gasket.
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Allen D
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64 Galaxie 500 with 428 FE
66 F-100 4x4 With 67 GT 390 Hi Pro and Toyota Power Steering
67 F-100 2wd for parts
68 F350 crew truck
80 Bronco with a 460 engine
90 Aerostar With 4.0
91 Aero 4x4 with 4.0
93 SHO Taurus
07 Mustang with 4.0
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