I went to buy a fan clutch for my 69 c10 250 L-6 W/AC. The parts girl asked me if I needed a thermal or non-thermal fan clutch and I didn't know how to answer. Which one do I need?
Thanx in advance
Dano


69 C10 LWB 250 L-6/3spd
79 C30 Crew Cab Dually 454 V-8/TH-400

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