i swapped my h22a1 from my prelude and it was working fine when it was in lude now its in civic hatch and its overheating at idle, and fan doesnt turn on, thermostat, water pump was changed when i pulled the motor out, and my lower hose is always cold, i tried bleeding the system also and still get cold air from heather...even tried putting paper clip for fan switch to run fan all the time and car still over heats at idle
new water pump
new thermostat
tried different fan switch from jdm motor i have
tried different rad caps

the only thing i eliminated from that motor is first water sensor the one that reads temp when coolant flows in, its located at top rad hose/block(top entered for water) jdm motors dont have that sensor there so i didnt wire one up. Could that be the problem? if so why doesnt jdm motor have it.

what could it be??

 

there should be a sensor there....my jdm has it

 

thermostat not opening.

 

you sure you installed the thermostat correctly??? if the lower hose is not getting warm then the water is not getting past the thermostat. another question i have for you is, what ECU are you using? any CEL's? i have a jdm h22 and the only water temp sensor i believe there is would be on the cylinder head below the distributor. i would check the wiring to the fan switch to make sure it has power going to the switch. or check the relay to the fan

 

That sounds like the problem to me, but I admit that I couldn't really follow your description.

 

thermostat is installed correctly and its working i checked by heating it up in water but its not opening when its installed
running usdm p13
fan will only runs if i stick paper clip into fan switch sensor clip ECT switch A

im thinking of hooking up ECT switch B i just dont know were to run the wires for it, currently looking at service manual online and cant find where they go to

 

Does the car overheat without the Thermostat installed??
(not trying to call you out or anything) It kind of sounds like the thermostat is being installed upside down.

 

Thermostat installed with pin up but I'll try running it without thermostat after I try wiring up ect B and there's no cel my check engine just stays on without blinking

 

One other thought, whats the condition of the Radiator??
Could the core be blocked at all??

 

It's civics rad and it's fine

 

still have an air pocket, make sure to have the heater control valve open(heat on) while bleeding, and that radiator is too small for a h22

 

not really.

 

where did you get your ecu and wiring harness from?

 

heater on full and on hot position the air got a little warmer but didnt get warm or hot and ecu is from my prelude and wiring i made my self

 

i havent seen any h22 swaps in civics personally but if you think about it wouldnt the h22 flow to fast for that small of a radiator to cool properly, not calling you out just trying to help

 

the water flow is based on rpm output so i dont think the flow is a concern here. i've always used integra radiators because the water necks match up with the outlets on the h22s. a civic radiator off of a d-series would probably not even work since they use smaller water necks. h22s with closed decks may not ( dont quote me on this one) carry as much water/coolant as the newer h22s with larger water jackets. maybe thats what you were getting at

 

i learn something new everyday
im really liking this forum

 

just look around this forum and ull find h22 civic or press on my signature link

 

Problem solved, changed the cluster.. Car warms up good and with normal temp

 

so I’m having the exact same problem I literally just changed the radiator,water pump,took out the thermostat and bypassed the heater core but my **** says it’s over heating I don’t understand what could possibly be wrong