Hi need some wisdom if anybody knows as searching didnt match my fault

I cant seem to get any hot air from the heaters, with air con or normal air
It wasnt too bad after gym but i have a feeling its going to be chilly tomorrow,

Cant really give much more information, a pipe carrying coolant to the bulkhead split at the weekend but i sealed this straight away with silweld, highly recommend this to be an essential in the boot, but it hasnt split again and was fine for 3 days

Bump

I assume it worked OK before the split ?
In which case, I'd suspect an airlock.
If this is the case run it up to hot , with the heater controls on hot and the the expansion cap off to allow the air to escape.
Check the coolant level 1st though.