Having done a bit of research the problem is either the air mixer flap is stuck or broken or the valve that controls the water valve has an issue. The water valve is fitted to one of the pipes going into the heater and has a vacuum pipe going to it...the vacuum might not be working and stopping the valve from opening and closing to shut off the coolant or allow hot coolant into the heater. Check that your model has the same water valve.
The air mixer flap appears to be at the bottom of the heater box.
There is also a common fault where the control mechanism at right hand side gets stuck (clutch pedal side)...this needs the panels taking off at the front and the clutch pedal side for limited access. Symptoms are the air doesn't move with the different settings.
The fix is to put a peg back in place.
I would doubt that the whole heater unit needs replacing, but I haven't seen the car.
You think the price is right or they trying to fiddle the warranty ?
It's possible the price is right, there will be a lot of labour time as removing the heater box is a long winded and difficult job. Whether the second hand price is correct i couldn't say without pricing it up at breakers.
To remove the heater box and replace the broken flaps on a Peugeot 407 costs around £400 depending on who you get to do the job....that isn't replacing the whole heater box, only the flaps.
Ah , ok thanks, so it could all be right then. Is the technical name for it a "heater box?"
Cant seem to find one online with that name.
Was told the problem is some straps running from the control are broken inside it if that helps, doesn't make much sense to me though.
Heater box is my name for the heater assembly.
This is a manual aircon housing unit...
Vauxhall Opel Zafira B MK2 Heater Housing Air Distribution for Manual air con AC | eBay
zafira b heater housing - Google Search
This is the housing unit complete....Click on more images for Zafira B heater housing.
Thanks,
Ours would be for electronic climate control, so I take it that would make it more expensive
The Mrs saw what the part was today that needs sortingit's a small plastic looking thingcan't see how this would be so expensive unless it's a micro chip or processor of some kind
The electronic climate control one could be more expensive.
Here's a different view of the unit...AIR CONDITIONING, HEATER AND EVAPORATOR UNIT AND FAN VAUXHALL ZAFIRA-B
Ok,
Another update
Apparently the bit of plastic shown to the Mrs was a chunk of plastic from the actuall Heater box.
It has a hole in it so the complete unit needs replacing ... And would seem to the the cause of the problem .
Have no idea how this happened of course .
I think it's probably a problem the previous owner had .