Can someone please tell me how to change the coolant temperature sensor on a 91 Civic LX? Pictures would be great.

 

Its REALLLLLLLLLY easy,


https://honda-tech.com/zerothread?id=1230480

 

There are 3 coolant temp sensors on that car.

1 for the radiator fan On/Off - LIGHT BLUE
1 for the temp gauge on the dash - LIME GREEN
1 for the ECU - RED


What's the problem/ Which one?




That's my good deed for they day......




Should be saved somewhere as this question gets asked 1000X a month.

 

could this be a reason why my fan doesnt kick in. or atleast i dont think it does.
it worked when i was running stock engine, but now with the swap ive never noticed it come on? and yes its reconnected, ive checked that numorous times.

91 dx hb with sohc d15b vtec..

 

ALSO, Coolent temp fans wont kick on till about 220. I installed a Water temp guage, cause my fans wernt kicking on when I thought they should have. I mean the radiator hoses were flippin HOT, but my temp guage was reading 160, also when your driving, just the movement thru the bumper will keep it cool enough so the fans never kick on.

SO what controll the fans is 2 things, the ECT, and the relays. thats it. those sender units(in the head) are for readings in the ECU\guages.

 

cool thanks.
ive just found it weird that the fan never kicks on. ive heard other cars run for like 5mins and the fan kicks in if its just sitting there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by d15civ &raquo;</TD></TR><TR><TD CLASS="quote">cool thanks.
ive just found it weird that the fan never kicks on. ive heard other cars run for like 5mins and the fan kicks in if its just sitting there.</TD></TR></TABLE>

what cars????

 

I'm getting a code 8 which is TDC Sensor but my distributor is brand new, does anybody know if it could be one of the other sensors in the pic. above?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by illwill33 &raquo;</TD></TR><TR><TD CLASS="quote">I'm getting a code 8 which is TDC Sensor but my distributor is brand new, does anybody know if it could be one of the other sensors in the pic. above?</TD></TR></TABLE>

Nope its the sensor inside the distributor, but make sure your timing is set at tdc also.

7PSI CRX nice pic and explanation

 

Coo, i'll check the dizzy but i doubt it, one thing i did not do was the adjust the timing belt when i replaced my alternator.