Wipers off, scuttle panel off, it's behind that lot.

I have done a write up on here how to test these, search my old posts.

https://passionford.com/forum/ford-p...-air-only.html

If it is the heater valve, replace with gen Ford, the pattern ones might be 1/3rd of price but they are generally crap, sister had one fitted in her Sport Ka and it still blows hot air out on occasions!