I bought that ranger off here a few months ago and have been repairing it to my standards. i can not get the damn thing to warm up. the water pump took a shit so I replaced both the tstat and water pump today the tstat now twice (auto zone brand/car quest brand) i can drive it and open the hood and take the radiator cap off like nothing, no pressure, no heat, nothing. im thinking the heater core is plugged? but the operating temp shouldnt it? fuck gas vehicles