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  1. J

    Surging when heater turned on

    1993 k3500 7.4 tbi nv4500. Truck will surge than almost stall and repeat when heater is turned on. I recently had to replace the lower radiator hose. Since I had to drain most of the coolant anyways I thought it be a good time to replace thermostat and cts. The cts is the cheap oreillys brand...
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