what is the sensor on the head, on the passenger (left) side of an 88-91 crx just below the upper radiator hose connection on the block, there are 2 one is a single point sticking off the block that i have never used on my zc but there is another more toward the front (header) side of the block at screws onto the block, and on the inside looks like a temperature sensor, well i need to know what it is because i broke it when i just put my engine in the car after doing some work on it, not a big deal i can get one from either parts dealer or junk yard but im curious as to what it is because it seemed highly damaged b4 i ever broke it and now i see the wires are crossed.

 

There are 2 sensors on the head under the distributor. one has a single wire and is the temp sensor for the gauge. The second one is the sensor that sends a signal tot he ECU. Hope that helps as mine is a D16a6 in an Si.

 

its a double wire sensor on the front im looking for what exactly it goes to and what is its purpose.

 

its the thermo sensor for the ecu. my car had one that was broken off and the car wouldnt start till i replaced it.

 

well havent tried to start it up just replaced the alternator, water pump and did a valve job, i lost a bolt to the suspension so i gotta go get a replacement one later in order to get things back together (no big deal) but im not in a hurry. anyways, does anyone know if the thermo switch is compatable with same year civics? or integras for that case? im gonna run down to the junkyard in a few days and will just get a new one (well new to me) before i start the car up again, typically 88-91 civics use the same parts and im wondering if this is the case because the junk yards i go to rarely have any crx parts but of course have many civics especially wagons and 4 doors.

 

ok anyone know the exact name for it, at autozone they have a few sensors but the names go as follows:
engine coolant sensor (not it i believe this is the one that goes on the back of the block)
engine temperature sensor (i believe this is the right one but not entirely sure)
and then a bunch of other ones... does anyone know the exact name of the sensor or is it the thermo sensor? (is that the name that id be referring to when trying to get a replacement)? thanks for any input planning on fixing it today

 

its kind of late now, but when i called honda for my car they said it was the thermo sensor. i hope you get it fixed, good luck.

 

yah replaced it went to a specialty import store (specialized in vw bugs actually) in order to find it but it was called a radiator thermo sensor, cost about 22 bucks, direct replacement and the zc uses the same one as the si, but years are different the 88 is different than the 89 etc... and the hf's and dx's use different ones also if anyone ever needs to replace one its easiest to just take it off the block and bring it on down.

 

what causes the coolant to boil in the reserve bottle