Here we go with another
ing problem!!! Arrrrh, I am really dissappointed with my truck too.
I bought mine used off the lot, assuming it would be like my old "90" S-10, a rugged battle axe.
Nothing doing, this "Truck" if it can be called such, is tempermental, underpowered, and cruddy gas
mileage to boot. I will surely rethink buying a GM product again. Now to my point, those of you who can
build electronic circuits, may consider making a PWM power supply to control the fan motor. Here is a
schematic that I have used for 30 amp motors on other projects with great success.
U1=555 timer IC
D1, D2, D3=1N4001 diode
C1, C2=100 micro farad, 20V.D.C. electrolytic capacitor (Tantalum OK)
C3=1 micro farad, 20 Volt D.C. electrolytic capacitor (Tantalum OK)
R1=33,000 ohm 1/8watt resistor
R2=50,000 ohm variable resisitor
R3, R4, R5= .1 ohm, 2watt wirewound resistor
R6=1000 ohm, 1/8watt resistor
All transistors=TIP-3055 in heatsinks
It is best to house the circuit inside of a plastic enclosure with vent holes to allow air to flow over the transistors
heatsinks. Each Transistor should be sinked to a 1/8th" x 2" x 2" aluminum plate. The transistors should
be insulated electrically from the heat sinks, with special mylar film insulators. All the parts can be bought at
Radio Shack for around 35-45 dollars.