Prev: Apple Co-founder's 2010 Toyota Prius has Sudden Acceleration Flaws
Next: Toyota struggles to stop runaway crisis
From: mark on 4 Feb 2010 20:15
I am building an airboat and have an old 350 chev. in it. It
originally had a clutch fan on it. I want to hook up an electric fan
that will turn on when the radiator gets hot and off when not needed.
Does anyone know what vehicle would have a fan switch with 3/8" NPT
pipe thread as this would thread into the chev. thermostat housing (I
assume this is where I should put it). I could use adapters if needed.
My local auto parts stores can't look up this info, they just want the
year make and model of vehicle. I already have everything wired with a
relay and the auto parts guy gave me what I think is a temp. sending
unit. I want something that is open when cool and grounds when temp is
hot. Thanks
From: twisted on 4 Feb 2010 20:26
On Feb 4, 8:15 pm, mark <markha...(a)hotmail.com> wrote:
> I am building an airboat and have an old 350 chev. in it. It
> originally had a clutch fan on it. I want to hook up an electric fan
> that will turn on when the radiator gets hot and off when not needed.
> Does anyone know what vehicle would have a fan switch with 3/8" NPT
> pipe thread as this would thread into the chev. thermostat housing (I
> assume this is where I should put it). I could use adapters if needed.
> My local auto parts stores can't look up this info, they just want the
> year make and model of vehicle. I already have everything wired with a
> relay and the auto parts guy gave me what I think is a temp. sending
> unit. I want something that is open when cool and grounds when temp is
> hot. Thanks

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Coolant-Fan-Switch-BWD_5970598-P_420_R|GRPSESWAMS_575849800___
From: twisted on 4 Feb 2010 20:32
On Feb 4, 8:15 pm, mark <markha...(a)hotmail.com> wrote:
> I am building an airboat and have an old 350 chev. in it. It
> originally had a clutch fan on it. I want to hook up an electric fan
> that will turn on when the radiator gets hot and off when not needed.
> Does anyone know what vehicle would have a fan switch with 3/8" NPT
> pipe thread as this would thread into the chev. thermostat housing (I
> assume this is where I should put it). I could use adapters if needed.
> My local auto parts stores can't look up this info, they just want the
> year make and model of vehicle. I already have everything wired with a
> relay and the auto parts guy gave me what I think is a temp. sending
> unit. I want something that is open when cool and grounds when temp is
> hot. Thanks

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Coolant-Fan-Switch-BWD_5974003-P_420_R|GRPSESWAMS_575654365___
From: mark on 4 Feb 2010 20:34
On Feb 4, 9:26 pm, twisted <thenited...(a)yahoo.com> wrote:
> On Feb 4, 8:15 pm, mark <markha...(a)hotmail.com> wrote:
>
> > I am building an airboat and have an old 350 chev. in it. It
> > originally had a clutch fan on it. I want to hook up an electric fan
> > that will turn on when the radiator gets hot and off when not needed.
> > Does anyone know what vehicle would have a fan switch with 3/8" NPT
> > pipe thread as this would thread into the chev. thermostat housing (I
> > assume this is where I should put it). I could use adapters if needed.
> > My local auto parts stores can't look up this info, they just want the
> > year make and model of vehicle. I already have everything wired with a
> > relay and the auto parts guy gave me what I think is a temp. sending
> > unit. I want something that is open when cool and grounds when temp is
> > hot. Thanks
>
> http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Co...GRPSESWAMS_575849800___

That is exacty what the guy at the parts store sold me. I ran the
engine today for 10 minutes and the rad got too hot to touch, (cap
off) and the fan did not turn on, I pulled the wire off the sensor and
grounded it to the block and it ran fine. Is it just not hot enough?
What temp. do these switches typically trip at? Thanks
From: Hachiroku ハチロク on 4 Feb 2010 20:40
On Thu, 04 Feb 2010 17:34:39 -0800, mark wrote:

> On Feb 4, 9:26 pm, twisted <thenited...(a)yahoo.com> wrote:
>> On Feb 4, 8:15 pm, mark <markha...(a)hotmail.com> wrote:
>>
>> > I am building an airboat and have an old 350 chev. in it. It
>> > originally had a clutch fan on it. I want to hook up an electric fan
>> > that will turn on when the radiator gets hot and off when not needed.
>> > Does anyone know what vehicle would have a fan switch with 3/8" NPT
>> > pipe thread as this would thread into the chev. thermostat housing (I
>> > assume this is where I should put it). I could use adapters if needed.
>> > My local auto parts stores can't look up this info, they just want the
>> > year make and model of vehicle. I already have everything wired with a
>> > relay and the auto parts guy gave me what I think is a temp. sending
>> > unit. I want something that is open when cool and grounds when temp is
>> > hot. Thanks
>>
>> http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Co...GRPSESWAMS_575849800___
>
> That is exacty what the guy at the parts store sold me. I ran the engine
> today for 10 minutes and the rad got too hot to touch, (cap off) and the
> fan did not turn on, I pulled the wire off the sensor and grounded it to
> the block and it ran fine. Is it just not hot enough? What temp. do these
> switches typically trip at? Thanks


You either have a bad switch or a bad ground!
The switch should trip about 200 degrees F.
If the fan ran when it was grounded, then run a lug from the base of the
switch to a good ground, or right to the engine, or try another switch.

On way to test the switch is to fill a pan with just enough water to cover
the sensor end, attach an ohmmeter to the leads, and boil the water. If
the ohmmeter doesn't go to about 3-4 ohms or less when the water's
boiling, you need another switch.


 |  Next  |  Last
Pages: 1 2 3 4 5
Prev: Apple Co-founder's 2010 Toyota Prius has Sudden Acceleration Flaws
Next: Toyota struggles to stop runaway crisis