Well I thought I fixed my overheating problem, but I guess not, heres what it does when I'm completely stop it starts to overheat and i don't hear the fans engage. I have replaced all of the coolant sensors and i get the one for the gauge on monday. I have drained and added new coolant new thermostat, and tested that the fans work. And after all that It still overheats. Any help on what I should do would be great! BTW this is on a 90 Accord 2Dr EX

 

Don't know/remember the history here, so some of the questions might be frustrating or repeated,,,,,sorry.

1) Does it do this all of the time. I ask as in your wording you say when you don't hear them come on? Does this mean they sometimes do come on?
2) Did you bleed the coolant with the heater control valve open?
3) Did you test the fans by jumping thermo a (t-stat) with the key on?
4) Is it possible the flow is being restricted....how did the inside of the rad look when you drained the coolant?

 

The fans come on after the car shuts off for about 2 secs and then they shut off and never come back on.

No I did not have not heard about the heater control valve. I will look into that first thing tomorrow morning.

Yes i did test the fans and they both work by grounding out the sensor.

Don't understand rad but the old coolant was pretty clean.

Thanks, I think the control valve might be my problem, how exactly would the procedure go using the control valve?

 

Sorry...bad of me for not giving more detail...working on that.

To bleed the air out of the cooling system. You will need to have the heater control selector (the "slider" inside the car, like it was 0 outside....set to heat). On the t-stat housing is the bleeder valve that needs to be open-looks just like the ones on the brake system. Look for posts about doing this....I'd give my method but don't want to start a debate.

Looking into the rad with the cap off and when the fluid was out.....did you see build up of, well, "stuff"?

 

Perfect, thanks for the information on the valve, I will for sure try that tommorow. As for the rad their was nothing, it was pretty clean like brand new clean.

 

That was not it, I had plenty of coolant and the Control valve was wide open. Heres another question I have, there is a second temp sensor on the thermostat housing, I did not replace this one but the other owner did. But this sensor is not OEM because its pink. But if i ground out those two wires both fans come on.

I have read up on some non-OEM sensors that give out false readings. Heres what I want to test, at what temperature does that sensor on the thermostat suppose to activate the fans?

 

Ah, yea.

The one on the t-stat is the one that makes the fans come when the car is on....4th gen is like 194*, the switch closes sending ground to both fan relays. Click on the below....

https://www.hondaaccordforum.com/for...similar-44973/

 

That was it, the sensor on the t-stat housing was faulty. Thanks for you help and that guide is really helpful.

 

Glad you got it...