Hi everyone' can anybody explain the awful smell I'm getting in my focus 1.6 climate change' smell's like sour milk and just came overnight' really really terrible smell ' been 6 days now and it doe's seem to be going however don't know where this smell came from (cat converter perhaps)

Is it coming from the vents?

If so it may well be bacteria build up.

In that case buy a can of aircon cleaner from Halfords and follow the instructions.

have you changed your pollen filter recently?

Is it coming from the vents?

If so it may well be bacteria build up.

In that case buy a can of aircon cleaner from Halfords and follow the instructions.

thanks guys ' going to take a look at the pollen filter' air con doesn't seem to work may need filling up will get this checked out as well.

A clogged or wet pollen filter will reduce airflow through the vents so probably the best and first point of investigation.

with the aircon not working its likely the moisture that stays in the system has turned to bacteria very nasty not advisable to be breathing that in if you get the aircon refilled and a bacterial clean then it should go away if it was the cat youde smell it at the tail pipe

Have you pumped in the car?

thanks for all replies to my post ' smell has now gone however it may return ' going to take advice from you lot and change pollen filter and also get air con checked out . cheers and thank you