[quote name='inanimate_object' date='Aug 9 2005, 10:14 AM']The radiator fan switch is totally independant of the thermostat - If it's not working or activating the fans too late the needle will continue to rise until the fans are turned on ie. what this guy is experiencing.



Mark


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I'm very much aware of the fan's being controlled independantly of the T-stat. However, both the Stock temp gauge AND the thermoswitch BOTH WAIT very long before doing what they should do (Temp gauge rising, and switching on the fans...)



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Then it sounds like you need a new thermoswitch too.



Mark

[quote name='inanimate_object' date='Aug 9 2005, 10:29 AM']Precisely.



Mark


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[quote name='PhoenixDownVII' date='Aug 9 2005, 0314 PM']Exactly.



Dan

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Indubitably https://www.nopistons.com/forums/pub...IR#>/bigok.gif



Actually, I haven't heard of the stock thermoswitch going bad very often. But like Phoenix suggested, it waits too long to turn the fans on. I think most only switch it out for the lower threshold temp of the FC or Miata switch, which IMHO, makes sense.

Where is the The radiator fan switch I my fans do not come on at all. I dont drive the car around yet. but I let it idel for around 5 - 7 min waiting to see if the fans would come one and they didnt. the stock gauge was at 9o'clock and the upper rad hose was hot so I turned it off.

[quote name='87GTR' date='Aug 10 2005, 01:44 AM']Where is the The radiator fan switch I my fans do not come on at all. I dont drive the car around yet. but I let it idel for around 5 - 7 min waiting to see if the fans would come one and they didnt. the stock gauge was at 9o'clock and the upper rad hose was hot so I turned it off.


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Have you tried just running power from the battery to make sure they work? I don't know, maybe fuse or relay? I'm not good with tracking down electrical problems.

The thermoswitch is behind the waterpump housing, difficult to see until you remove the intake tubes, upper vacuum chamber and alternator. You can then see two sensors, IIRC, the thermoswitch is the lower one. The Service Manual shows you how to test it, but if your already in there, I'd just change it out for an 89 to 91 FC thermoswitch. It will plug right in and turns the fans on at 95 deg. C, where the stock FD sensor switches them on at 108 deg. C.



BTW, if you need a Service Manual, you can download one for free here:

http://www.iluvmyrx7.com/

Good luck.