Mk4.5 smiley face

You get the engine up to operating temps and then all you get is hot air through the vents, even when the dial is turned to cold

It psychically stops when it turns at either end so I'm not sure if the cable has come off or not, but sometimes it totally cold before getting blisteringly hot again

It's got ac if that makes a difference

Any pointers?

 

Faulty HCV (Heater control valve) common problem, so check this!

Martin

 

I would if I knew what to look for

I shall google it for now and hope its correct

 

underneath the scuttle panel towards the center i think from memory.

 

As above

 

As above has 2 pipes going into it i think if it's the same as a Ka.

 

as above, 2 pipes in and 2 pipes out and a multiplug on the side. ka or puma uses the same part if you're gonna hunt around a breakers. Be careful when taking the hoses off the unit though as the dowels are prone to breaking off!

 

These are controlled by a PWM circuit, there is no cable to regulate the temperature.

Easy way to test that the control circuit is working -

Get a 12v 5w bulb and couple bits of wire (I use an old mk4 Escort side repeater bulb/holder)

Disconnect heater control valve connector and connect the bulb to it.

With engine running, and heater hot/cold in varied positions the bulb will either

Stay off in one position

Be on all the time in the opposite position.

In the middle position it will flash about once a second.

http://www.fordpartsuk.com/shop/ford..._valve_531.htm

 

i shall try that at the weekend when i've got a spare few minutes

cheers for the info lads

 

Its that if your still looking.

 

cheers
bought one, just haven't fitted it yet as it's still cold according to my mrs

 

Have you changed it if so did it stop the hot air?

 

Bloody hope so by now

 

yes, fitted and sorted, fairly easy too