Electric Fan Adjustable Thermostats

[morganater]

I am wondering if anyone knows a good way besides a switch to turn on a pair of electric fans... I don't like trusting my adjustable thermostat, and a switch just gets old.

Anyone else have this trust issue?

[wekelm]

I had a relay go out on my probe. I got a new sensor/ relay from JC whitney for about $20.00. I attached it to the thermostat housing with plastic straps and now the fan comes on automatically when the engine reaches operating temp. I was using switches until then what a pain.

[hardtailjohn]

It would be easy to wire in a light in series with the circuit for the fan, so that when the fan comes on, the light comes on... that way you can keep some tabs on the operation. Big trucks (class 8 ) have used fan clutches for years and they're thermostat controlled, as well as having a manual override. I've been driving for over 25 years and have yet to see one fail in normal use.. that may or may not be the case with the aftermarket stuff you use on your pickup.
John H.

[ttyR2]

Heh, the Kenworth I drive uses an air actuated fan clutch, so it's a hair more reliable than the electric setups on cars and trucks. I did have the bearings go out in it once. Fun!

[hardtailjohn]

They're air acuated, but still electrically controlled... at least all the ones I've worked on are, unless you're driving a really old truck, as the very first ones had an airline to the cab for the control (so I've been told.. but never seen one set up that way). My '65KW has a Horton and my '75KW has a Bendix.
John H.

[mrsnicks]

I came across a nice wiring diagram for dual electric fans that include an in-dash switch, as well as light.

http://www.v6-s12.com/images/Projects/F ... ng_new.jpg

Looks to be pretty nice.

Patrick