Im not sure how to check. Dont realy feel much coming out of the screen vent in eithet position. Not had a chance to take off the plates yet as dont have the tool to get em off till wkend. What would be a reason to block them up be?Sounds like a bodge job,
When you change the flap position does it alter the air flow?
Cheers
Don't be surprised if the heater box/channel is mostly rust. Easily fixed though.
Plus washer motor makes a noise but nothing comes out. Then found out the bottle leaks... would that stop them from squirting?
Your heater unit - the thing on the bulkhead on the passenger side - has no coolant pipes going to it.