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Fan Switch, By Engine Temp With Wiring (185)

Fits: 1948-79 Ford F-100 Trucks (Each truck takes 1)

Part Number: 5038

Sorry, this item is no longer available. See notes and alternate parts below.

& WIRING KIT includes wire harness, engine block or intake mounted sensor,
fan relay, fuse and connectors. Temp range 190-ON 173-OFF

This kit operates on
radiator temp, if you have AC he needs 5037.  CAUTION IF USING AC SEE 5037, If switch for
radiator temp only is used it will allow heat to build up in the condenser,
then heat is transferred to radiator as water flows.  the radiator sensor will not turn fan on until
that heat is felt in radiator, letting extra heat build up in condenser so AC
system pressure can get higher and the passenger vent temperatures warmer.

Do not put over 3 amps to
it will blow. only takes 1/4 amp to trip relay 

Using thread sealant on electrical senders cou ld cause added resistance to ground which will make the gauges read lower than actual. Loctite makes an anti-seize called Graphite 50 that is electrically conductive. If you feel the temperature or oil pressure sender needs to be sealed, Loctite Graphite 50 would be an ideal choice of sealant since it will not add resistance to the sender ground.

California Prop 65 Warning

Cancer and Reproductive Harm

Part Instructions
Fan switch by engine temperature, 1 of 2 PDF
Fan switch by engine temperature, 2 of 2 PDF
Radiator fan switches PDF
Catalog History
F100 - 2017 Pg. 72 PDF
F100 - 2016 Pg. 72 PDF
F100 - 2014 Pg. 72 PDF
F100 - 2012 Pg. 78 PDF
F100 - 2011 Pg. 78 PDF

Unless otherwise noted, our parts fit only these applications:

12 volt, negative ground
6½ foot flareside (a.k.a stepside)
Body Style
F-100, F1