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Hello, my name is***** one hose is hot and one cold that would mean the heater core is clogged. Sometimes disconnecting both of the hoses and then using a garden hose to flush out from both directions. If that doesn't help then heater core will need to be replaced. Let me know if you have more questions or if there is anything else I can do to help. Thanks.
That could still mean poor coolant flow which would be different then now flow. have you pulled off cold side to see if coolant flows to it?
Or does heat get any better at higher engine rpm?
Try at higher RPM. I do not see a HCV in system, if it works at higher RPM that points toward weak water pump. Let me know, thanks.
If heater core has been replaced it is sounding more like a water pump but nothing lost by trying the compressed air. Let me know how it turns out, thanks.
Sounds good, I'll talk to you then. Thanks.
Good to hear, I'm surprised the new heater core would already need to be cleaned. Thanks for update, let me know if there is anything else I can do to help. Thanks.