Heater core zero flow, cause to run hot?
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Joined: Oct 2014
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Heater core zero flow, cause to run hot? 160 stat, fan switch, new rad, new water pump, new cap, new condenser, new hoses, bled the shoebox way and still it starts to run hot. 220 mark plus. I'm not getting hot air when I turn on the heater, just cool air. I go check to hose going from the heater core to the water pump and it collapses when squeezed because nothing is in it. It just runs hot and keeps creeping up further at every light. Starts to cool off as the car moves. Next light it's hotter than the one before, repeat to 220+. Granted it's summer in PHX in rush hour stop and go for 5 miles. I just feel it should level off and stay at a temp like all my other fbodies.
Can a clogged heater core cause gradual overheating?
Can a clogged heater core cause gradual overheating?
Absolutely, you're not gettting the circulation needed in the system. I can tell you a way to clear a clogged heater core and it may work but in the end you may need to replace anyway. The rusted heater core is sending that into the rest of the cooling system.
Remove the lines from the water pump and with them upright fill the system up with CLR and allow to soak for a 20-30 mins then take you air nozzel and blow compressed air into one of the lines to clear the clog. Have plenty of towels as it can get messy. Repeat if needed and finally rinse through with distilled water.
