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cooling fan problem b18c type r

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Old 06-28-2012, 04:30 PM
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Default cooling fan problem b18c type r
fixed
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Old 06-29-2012, 04:31 AM
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Default 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?
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Old 06-29-2012, 06:02 AM
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Default Re: cooling fan problem b18c type r
Originally Posted by whoaitzbrain
does the temp cooling sensor on the head have anything to do with the fan?
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
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Old 06-29-2012, 07:27 AM
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Default Re: cooling fan problem b18c type r
Losing coolant? Is the coolant actually flowing? Both hoses getting hot?
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Old 06-29-2012, 07:33 AM
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Default Re: cooling fan problem b18c type r
Originally Posted by grumblemarc
Losing coolant? Is the coolant actually flowing? Both hoses getting hot?
no, not losing any coolant. yes, both hoses are hot.
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Old 06-29-2012, 07:37 AM
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Default Re: cooling fan problem b18c type r
Originally Posted by dpetro1
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
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 ****!

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?
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Old 06-29-2012, 08:49 AM
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Default Re: cooling fan problem b18c type r
Originally Posted by whoaitzbrain
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 ****!

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?
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
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Old 06-29-2012, 09:37 AM
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Default Re: cooling fan problem b18c type r
Originally Posted by whoaitzbrain
is there any way to check to see if the switches are good before I go buy a new one?
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.
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Old 06-29-2012, 12:01 PM
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Default 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.
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Old 06-29-2012, 12:49 PM
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Default Re: cooling fan problem b18c type r
Originally Posted by axis11
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.
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.


Originally Posted by dpetro1
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
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.
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Old 06-29-2012, 01:13 PM
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Default Re: cooling fan problem b18c type r
yup, sounds like a bad thermal switch. Mishimoto is not the best, OEM FTW
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Old 06-29-2012, 02:33 PM
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Default 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)?
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Old 06-29-2012, 04:53 PM
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Default Re: cooling fan problem b18c type r
Originally Posted by RonJ@HT
If you jump the unplugged 2P fan switch connector, does the fan run when the key is in ON(II)?
haha RON! I was hoping you would chime in on this, yes it comes on when the key position is ON(II).
Last edited by whoaitzbrain; 06-30-2012 at 11:48 AM.
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Old 06-30-2012, 11:49 AM
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Default 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 ****! thanks for the help guys
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