My 2006 focus ST’s heater will only blow cold air. I managed to get it blowing quite hot yesterday after fiddling with it but it has stopped working again. The temp gauge on the dash is going up as normal and settling on about half way and the coolant level looks ok, a bit above the minimum mark. Does anyone have any ideas on an easy fix or do i need to take it to a mechanic? 

What were you fiddling with?

I was fiddling with the controls inside. Turning it up and down and between hot a cold etc…

13 minutes ago, TomsFocus said:

What were you fiddling with?

I was fiddling with the controls inside. Turning it up and down and between hot a cold etc…

1 hour ago, Gaz Beasley said:

 

I was fiddling with the controls inside. Turning it up and down and between hot a cold etc…

Electronic climate or manual dials?

42 minutes ago, TomsFocus said:

Electronic climate or manual dials?

Theyre the older turny knobs not the modern electronic buttons

 

2 hours ago, TomsFocus said:

What were you fiddling with?

A Stradivari ?

3 minutes ago, Gaz Beasley said:

Theyre the older turny knobs not the modern electronic buttons

The cable has probably come off the back of the panel.  Next step would be removing the dash fascia and the heater control panel to check the cable.

If you use the search here on the forum for "Heater Cable"  https://www.fordownersclub.com/search/?q="heater cable"&quick=1&updated_after=any&sortby=relevancy  you will get about 14 results. I'm sure some of them will give you some tips on how to fix the issue.

An example of one of the threads:

 

if its not a cable, try looking at the thermistor or whatever its called