I had to backflush the heater core in my 93 Pace Car each year or I would barely get warm air. I think it was the piss poor design of the heater hoses that make all those nice sharp 90 degree bends trying to get from the engine to the heater core. I'd be out there on a 38 degree day flushing it out while the garden hose wasn't frozen.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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