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Re: 89 GMC Cummins conversion
I found the installation instructions for the B&M trans cooler and the instructions show that the fan is suppose to come on at 176 degrees F (+ or - 5.4 F) and turn off at 140 degrees F (+ or - 5.4 F). I don't think that this is accurate but the next time I take it out I will take my infrared thermometer and check.
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1987 GMC R2500 SC 454 T400
1988 Chevy R30 CC DRW 12 valve Cummins NV4500 GearVendors
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