If you're rear line is leaking your radiator can't be full. Not sure what you mean blow but yes will cause it to overheat. The rear line comes from the same radiator and you should be low. Are you looking in your overflow bottle where you add your coolant and seeing fluid in there is that why you think it is full?
codes p0171 & p0174 banks 1&2 are to lean. how do I mix the problem.sputters and...
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codes p0171 & p0174 banks 1&2 are to lean. how do I mix the problem.sputters and stalls out when idling