1973 Mach 1

[Oldkckr41]

Could anyone Identify this for me?
Right side under fender at outer door post

 

[manicmechanic007]

Looks like they are calling it a A/C - heater -defrost relay

 

[Mcmahst]

No, that’s part of the emission control system, used on 351 cars. The sensor pictured was an air, ambient temp sensor. Ypu can find it in the Ford Service Manual, Emission systems chapter.

Heres a pic of mine on my 73: