98 1.4 How to test a HCV is working? - Jason D
Hi, the heater on my fiesta is stuck on hot.

The problem arose when the heater was stuck on cold. I read some posts on honestjohn and they suggestes changing the Heater control valve.
I did this back in November. I think it worked ok, but then after a while it got stuck on hot air coming out.
The bloke in the shop suggested I should buy another one and try that.
However before splashing out another 30 quid I want to test that is the problem.

How can I test the HCV to see if it is working?
I understand it is driven by a variable phase pulse cycle. I dont have a scope, but I have got a multimeter and a variable power supply unit.

Any ideas?
Cheers#
Jason.