The heater fan relay for a 1993 Silverado 4x4 6.5 turbo diesel can be found using the engine diagram. The engine diagram will be provided by the car manufacturer upon inquiry.
how to fix wiper relay Chevy silverado 03
fuel pump relay location
under the hood on passenger side there will be three relays one is the blower fan relay unplug them one by one and test them to see which has a current when you turn the fan on
Scudo heater relay under bonnet on drivers side in fuse box
above the a/c and heater housing, behind the glove box , right side dash
Go To Your Underhood Fuse/Relay Center Located Near The Master Cylinder. You Will Find The Relay There.
Your heater relay switch may be bad
How do I test the air intake heater relay on a 7.3 desiel
If the fuse that controls the PCM relay for the fuel heater on a 1999 diesel keeps burning out, perhaps there is a short somewhere in the wiring. There is also a possibility that the ground wire for the fuel heater is no longer attached to the frame.
turn signal relay on 2000 f250 diesel
if it's because your heater only works on high the relay you would need to change would be in the back of the glove box
Behind glove box in dash