i just swapped my old d15b2 with a new one and now my heater doesnt work very good. anyone kno watsup?

 

you probably did not get the heater core bled well try jacking the front of the car up pretty high and bleeding the coolant. Also check and make sure that the valve under the hood is working correctly, you may have knocked the cable off.

 

+1 on the valve cable....def somethin to check. i forgot the same thing on my b16. forgot to loop the cable back on