What would cause coolant to not flow through engine even with high pressure?
What is your question?
I have replaced the radiator and thermostat. Cannot get any heat because coolant will not flow through the system. Tried back flushing with no problems, replaced the radiator cap, turned car, and heat on. Took a while to get pressure on coolant system but once I did the coolant seem to not flow past thermostat which is new. The previous radiator cracked from so much back pressure. Again, I backed flushed the system using a water hose with no problem. Why can I not get any flow to relieve pressure on the radiator?
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