Yet another problem with this %&@$ing car.
We did a coolant change with a new header tank yesterday. All went fine except for the fact that trying to run the heater for a few minutes as described in the OOF maintenance guide takes no heed of the fact the heater doesn't come on until after a delay (as far as I can tell).
So I tried running the engine with the heater on full as per the guide - it didn't come on because, I thought, the engine is obviously not warm enough yet and unlikely to warm up stationary for 20 minutes or so. So after ten minutes I give up and complete the rest of the coolant change.
Now, having done the change I thought all was well as the car was behaving fine.
Come this afternoon, driving back from work, I put the heaters on to test them and wait... and wait.... and wait. Nothing. The control panel lights up and all the buttons work (i.e. the correct lights light up). I have now been outside checking fuses F33, F12 and F14 - they are all fine.
Another thread says something about K146 and K34 relays but I've no idea where they are.
I tried setting all temperatures on both dials, and also on LO. Basically, I tried every combination.
If I listen intently I can hear the fan start and stop and I can hear the engine put under load. Changing the fan speed does nothing and there is no discernible output of air from the vents.
As far as I know the car was fine before I did the coolant change. There are no missing hoses.
Could it be an airlock caused by doing the coolant? I'm not convinced of that because why would the fan not try to blow air (hot or cold) even if the heater matrix had no warmth / air con pump wasn't working?
ANY HELP GREATLY APPRECIATED!