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Originally Posted by bsilverado00
Let's see, I back flushed the heater core, it's not plugged, ran it w/o cap until operating temp, as said earlier replaced thermostat, flush and fill coolant, sporadic heat, all doors on heater box functioning properly, what should I check next??????????
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have you had to add coolant ? i can go 2-3yrs before i add a couple of oz. if you have leak this is the only reason i can come up with. does heat return when cap is removed if so this once again could be leak or worse a head gasket and some exhaust gases getting into coolant... i hope not !