"I have a soft spot for these early GM S trucks." My family thinks the soft spot I have is in between my ears!
Addressed some wiring today. Both cooling fans are run by a single rocker switch on the dash. No indicator light, thermal switch and no working
temperature gauge. A perfect setup to overheat the engine.
Since I recently got in running and it has been cold, no issues. I would just turn the heat on, once I felt heat, hit the switch.
Now that it is getting warm, had to fix it.
Basically what I did was split the fans and wired each to my under-hood panel. The relays are wired to close when ground is applied.
Who ever wired the fans originally used red for - ground and black for + hot. Threw me for a couple of minutes.
Since running new wires from the fans would make me pull the push bar, grill etc, the wires are marked using the appropriate color heat shrink.
Still looks weird having red wires going to my ground block!
The 2 thermal switches I installed are about 20 degrees apart so they come on and go off in stages.
I nervously let the truck idle, fan 1 came on after about 5 minutes, then 3 minutes later fan 2 kicked on. They turned off automatically, fan 2, then fan 1.
Success!
Also pulled about 50 feet of excess wire from under the hood and more to go. It is a nightmare with bad splices, wrong type of wire, etc etc.
Always fun having to undo before you can redo!
The coolant is from when I installed the them, they dont leak!
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