ok so I have an F20B in my cb

whats happening is this;

a few days ago it was getting hot about 3/4 to the top so i kicked on the heat hoped it would go back down. and it did but not right away and it went back to norm temp fast. so i continue on home. so before i get on the interstate it starts to heat back up and so i turn the heat back on and continue. during the 20ish mile high way drive home it stayed at about 3/4 the way hot and about a mile before my exit it drops back down and i get home with it fluctuating but not back to 3/4 hot again.

after home i take the t-stat out and drive it about 2 days. so then it started to get hot again. same thing 3/4 then droped.

so heres where im at. i have been letting it run in my drive way and using the bleeder valve on the t-stat to hopefully bleed out and air.

what ive noticed is that when it gets 3/4 hot the fan kicks on and with the bleed valve open the fluid stops flowing out. and the temp goes back down. i would let the system build pressure before i opened the valve so possible air would spew out. also i have plenty of coolant in the rad and the over flow take as well.

so ive also checked the weep hole on the WP(it is new, and i checked it just in case). ive seen nothing flowing out.

in the haynes manual it stated something I would not have thought of. Ignition timing can cause overheating.

and so far ive not seen any white smoke comeing out of the exhaust when i crank it up in the mornings either. ill check this trmw to make sure its not a head gasket but ive not seen any oil in the coolant system as i did drain the radiator when i took the t-stat out so i dont believe its a head gasket.

as of now im thinking ignition timing as ive not had it tuned yet.

any thoughts ideas or suggestions?

ill post a link to the other thread, but ive checked all sensors and replaced a few. i even went to the JY to get a fan switch timer and that didnt fix it, but ill be going again trmw cause its from a JY so maybe i just got a bad one.

im pretty sure its a wiring issue and an issue with the timing of the fans not coming on on time.

F20B overheating - CB7Tuner Forums

 

It could be thermoswitch A is not closing early enough to enable the fans, however my experience is these cars will not overheat as long as you're moving along at least 20-30 mph, even w/ AC on. Are you running the AC?

I would suggest buying or borrowing a IR thermal gun to shoot the thermostat housing and see what the temp is when gauge temp says 3/4 position. You could have a faulty thermister that senses temp.

good luck

 

your talking about the fan switch on the t-stat housing right? well ill tell you what ive done. ive swapped it with another sensor, didnt help then i went and bought a new one and it didnt help.

and i dont have A/C

i also found this thread and will be doing some of the test, i just dont really know how to do them and am not very experienced at doing thos kinda test. http://honda-tech.com/showthread.php?t=2889629

 

start with the basics.

how is your radiator cap?

are both fans working properly?

 

yes, ive done all the basics, cap is fine and holding presure, fans both work when i jump them. did a compression test, bleed the system, flushed the rad and the block. i here the relays when i jump the switch.i used a volt meter to test the sensors, not throwing any codes wither.

thats why i believe ive got a issue with the wiring or something along that line.

 

is there a secondery switch on those?

 

there is one.

however i just pulled the relay while they were jumped and only the cooling fan shut off. does that tell you anything?

 

i beleive there are on different relay. one is A/C other is radiator...

is coolant flowing?

 

that makes sense. lol i cant seem to fine the a/c relay, its suppoed to be in the front left corner of the car under the hood right?

 

wait....you dont have A/C....

diag car by interweb sucks donkey *****..