cooling fan problem b18c type r
 

fixed

Re: cooling fan problem b18c type r
 

bump, ac fan works. does the temp cooling sensor on the head have anything to do with the fan?

Re: cooling fan problem b18c type r
 

no.

if you jumped the fan and it turned on, that indicates a problem with the switch. install a new oem fan swtich and bleed the system. you should be all set

Re: cooling fan problem b18c type r
 

Losing coolant? Is the coolant actually flowing? Both hoses getting hot?

Re: cooling fan problem b18c type r
 

no, not losing any coolant. yes, both hoses are hot.

Re: cooling fan problem b18c type r
 

I have a spare Honda oem in now and the previous one is mishimoto low temp switch (only one year old). Maybe it possible both are bad? haha if so that's some shit!

thanks for the input guys, is there any way to check to see if the switches are good before I go buy a new one?

Re: cooling fan problem b18c type r
 

did you bleed the system after installing the spare switch?

fan troubleshooting (should work for most hondas)
https://honda-tech.com/forums/showthread.php?p=44511768

Re: cooling fan problem b18c type r
 

With the thermo switch connected on the engine & plugs off, use a multimeter to check for continuity on the 2 pins on the switch. It should be open when engine is cold, and it should be closed when coolant gets hot. If it proves to be working according to specs, check the connectors. If all of the above is ok, check for proper coolant circulation.

Re: cooling fan problem b18c type r
 

I had a mishimoto fan switch die on my shortly after install, and I talked to them and they sent me another, been fine after that.

Re: cooling fan problem b18c type r
 

Ok, I will get a hold of a meter this weekend, thanks bro. Circulation seems to be good, both hoses are hot and no fluid leaking.


Yes, I burped the system after re-install. I will check the troubleshooting guide out when I get from from work, thanks for the link! I'm sure it's going to be something really stupid in the end lol.

Re: cooling fan problem b18c type r
 

yup, sounds like a bad thermal switch. Mishimoto is not the best, OEM FTW

Re: cooling fan problem b18c type r
 

If you jump the unplugged 2P fan switch connector, does the fan run when the key is in ON(II)?

Re: cooling fan problem b18c type r
 

haha RON! I was hoping you would chime in on this, yes it comes on when the key position is ON(II).

Re: cooling fan problem b18c type r
 

turned out the to be the fan switch, got a new one and everything is fine. i guess the old honda oem one had gone bad from laying around and the mishimoto is just a piece of shit! thanks for the help guys