hey, i've tried searching for this problem, but can't find anything on it. a couple of days ago i swapped in a low mileage motor from attarco(D15B). while my motor was out, i never use a/c, so i decided to take out the a/c system. after i removed it all, my heater stopped working. i removed everything that has to do with the a/c. i even got an eliminator from an integra DA that had no a/c. i'm confused. do i need to have a/c to have heater? my old integra didn't have a/c, but the heater worked fine. can anyone help? its cold as hell son...lol

 

1. Check water valve and linkage on the firewall.
2. Check air doors/gates/linkage for proper operation.
3. Change thermostat (should have done that anyways)

 

hahaha, i'm such an idiot. the connection from the switch to the door wasn't connected. i feel hella dumb. my heaters hot as hell...lol thanks man.