Hi i have a 1996 fiesta and the heater was only blowing cold air i by passed the heater sensor valve in the engine and had hot air by the bucket loads. Bought a new heater sensor and although now blowing hot air could not change it to cold. I fitted a replacement heater panel inside in case this was the issue and now back to blowing cold only.....cant win!!
I assume the heater valve is operated by varying the voltage on the heater valve plug via the panel in the car so can anyone tell me the voltage expected on the valve plug, i did check this sometime back and it was at 7.5v and would not vary. Its a long shot but iv been cooked and frozen more times than David Attenborough.. .... its got to be something simple. Thanks