2002 HONDA CIVIC 1.7 L THERMOSTAT AND HOSES ; FANS WORK ONLY WHEN AC IS TURNED ON .

Asked by Mar 09, 2017 at 10:29 PM about the 2002 Honda Civic DX

Question type: Maintenance & Repair

my 2002 Honda Civic 1.7L is having issues with the cooling system , I think . The
fans won't turn on unless the AC is turned on and the hose that is connected to
my Thermostat gets really HOT BUT THE HOSE UNDERNEATH THE
THERMOSTAT stays cool . What does that mean ?  The temperature gauge
duoesn't rise up to say it's overheating it
just stays in the middle . What do I do?  Is there something wrong??

8 Answers

119,975

If the temperature gauge is in the middle then nothing is wrong. Are you losing coolant? The fans only come on when the coolant gets hot enough, they don't run when not needed.

24,435

Its about time for a radiator flush, and a thermostat change and a check both fans, one fan is for when the a/c is on (Auxiliary) and the other fan is for when the coolant reaches a certain temp (primary). If the primary is not working disconnect it and test with a jumper wires, if it works then test the relay, I will add a URL to copy & paste to show how to test relay. There is a sensor to turn on the fan and some test you can do.

24,435

http://troubleshootmyvehicle.com/honda/1.7L/radiator-fan-relay-test-1

1 people found this helpful.
24,435

ETC sensor (engine coolant sensor) replacement. urls below copy & paste

24,435

https://www.youtube.com/watch?v=xEw6hfqe3f8

24,435

https://www.youtube.com/watch?v=HO7IQuRbDIU

1 people found this helpful.
24,435

Fan switch test at thermostat housing (above uRl)

7,455

I got the the same car and I noticed that when I got it , hit the A/C and the fans go on ,any time you turn on heat fan that A/C light goes on , temp. gauge sits just below half , have put many miles on it with no problems .Haven't driven it in summer yet though .

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