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zeke5 01-12-2013 08:06 AM

Electric fan temp ?
 
I have a 88 350 Chevy small block that I converted to electric cooling fans. I am running the stock 195 deg. t-stat and have a fan sensor mounted in the t-stat housing (3/8 18 thread). I was using a 210 on 190 off (a little low) sending unit supplied by an online company and they seem to have a high failure rate. I would like to use something that I can get at a local auto store. What would the best open and close temperature be for this to work properly and not get too high, and does anyone have a part number. Thanks in advance.

vinniekq2 01-12-2013 08:16 AM

you can buy a variable switch from most stores.The failures are sometimes related to poor wiring/contacts.I use a heavier guage wire and heavy fuse.

zeke5 01-12-2013 08:44 AM

Wiring is all fine. Checked temp at housing with IR gun and sender is bad. Need recommendation for fixed temp screw in sensor.

cdminter59 01-12-2013 03:09 PM

Electric fan temp.
 
This is one of the best temp sending units you can get. Be Cool Replacement Electronic Sending Units 75099 - SummitRacing.com. They also have more with different temp settings. The ones at AutoZone and Advance Auto Parts are cheap attaches to coils on radiator.

cadillacdave1 01-12-2013 04:22 PM

I believe Hayden makes a unit that has the sender that screws into the intake manifold or block. It also has a relay which a good idea with electric fans. You can buy this at Advance/Discount Auto.

zeke5 01-13-2013 07:47 AM

I have had 2 of the BeCool sender fail. The fan will turn on and will not shut off after a few months of use (checked them with IR in the engine and on the bench) They replaced one under warrantee. I am trying to find a sensor that is over the counter so if it fails I don't need to special order it. Does anyone know of a OE sensor that would work in the head or t-stat housing. I know the head temp will be higher than the housing.

NEW INTERIORS 01-13-2013 09:48 AM

I run ALL my fan's to run as soon as the key is on.. Don't have to worry about counting on a sender to do it.. Seen too many cars burn up because of a sender not working..

ap72 01-13-2013 10:07 AM

Quote:

Originally Posted by zeke5 (Post 1633896)
I have a 88 350 Chevy small block that I converted to electric cooling fans. I am running the stock 195 deg. t-stat and have a fan sensor mounted in the t-stat housing (3/8 18 thread). I was using a 210 on 190 off (a little low) sending unit supplied by an online company and they seem to have a high failure rate. I would like to use something that I can get at a local auto store. What would the best open and close temperature be for this to work properly and not get too high, and does anyone have a part number. Thanks in advance.

take one off an older Escort, I think they're 220 on, 210 off, complete with pigtail connector the junkyard charged me a grand total of nothing last time I got one. i actually need to get another one for a different car next time I go.

cadillacdave1 01-13-2013 10:37 AM

The Hayden after market unit works well. It is the heavy duty fan controller and sells for about $50 from Advance/Discount Auto. If you have a problem they will return it. I have had mine on my car several years with no problems. It turns my fan on at 180* and turns off at 165*. It has a simple dial you turn with a screw driver to set when the fans turn on and off. It is fairly simple to install. Just keep an extra relay in the car if the relay ever goes bad.

sunsetdart 01-14-2013 04:15 AM

I had a sensor on my motor that turned the fans on at 195. But I have always put in a toggle over-ride in as well. Came in handy as one day riding around the sensor stopped and the temps went soaring. Hit the over ride and stopped the over heat.
Took out the sensor and just use the toggle now.

John long 01-14-2013 05:09 AM

If you have a sensor that turns off at 190 and a 195 tstat your fan will run all the time. The thermostat can be changed to 180 or another sensor installed for the fan. I have had really good luck with the adjustable sensor I installed. Sorry, I do not remember the brand. I know my electric fan and shroud is Cooling Components and suspect I got my sensor from them.

John L


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