yes, for some reason the heat was always shitty in my CRX. Last night it got worse, i have no heat what so ever now. the fan blows cold air with no heat. Ripping around with no heat in 10-20* weather sucks ***. i have a b16 in my car, i recently learned its a HF model 1988. Is it the thermostat? could it be anything esle? i didnt do the swap, i bought he car that way, maybe one of the radiator hoses isnt correct? I looked at the hose routing, everything looks they way it should be, ive done like 10 swaps, nothing looks out of the ordinary. it has the proper coolent level in the radiator. If anyone could help me out, that would be the best, i had to drive a hour and half last night in 15* weather with no heat. talk about fun stuff

 

It could be the heater core, but I would change the thermostat first. And check the heater cable to make sure every thing looks fine there.