Hello all i just finished swapping an obd1 ls into my 91 civic dx hatch, i was just wondering if someone can tell me where the coolant temp switch originally from the block is suppose to go or can i just route it to the coolant temp switch from the head? i also need to know if i can use the map that is on my engine instead of the firewall map, and if i can use the one on the engine what do i do about that extra plug thats on the fire wall map?

 

it is on the back of the thermostat on the obd1 ls, it is the third picture down on http://rywire.com/store/faqdesk_info...6e410182f6c602 , so just extend the wires and change the plug. You can use the map sensor on the motor. i did the same thing and just didn't plug in the other plug as it goes to all the emissions stuff i removed.

 

Ok, so the plug with 2 pins that i circled in red, i should splice with a obd1 fan switch plug?

 

yes, also you can use the MAP on your throttle body and leave the map on the firewall or remove it

 

truth ^^

 

the circled plug is the cooling fan switch. it turns on the fan. on an obd1 ls. like someone said, its a switch on the thermostat housing. just lengthen the wires