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Question edited for clarity and typo, and add maker.
Question moved to model category.
The AC evaporator core and the heating core are normally two separate items. It is unlikely that the heater core is completely clogged. There must be a valve in your flushing circuit.
The best way to get an answer for this go onto Youtube and they usually have fixrs for everything. Between last year and this year I have saved myself thousands of dollars repairing stuff myself through youtube.
I have a Late 1999 Chevy Silverado C1500 Z71. I had one of the heater
hose nozzle snap off this past weekend. I looks like the heater core
hase some kind connection fitting. And I had the same situation!
The right side hose coming from heater core runs into a connector. There is a hose parallel to this connector. At the end is what your looking for. If your wanting to replace this cause your heater doesnt work id recommend flushing your heater core first. My heat didnt work at all flushed it yesturday and works like a charm.
Number one you didn't get Freon in your charge. So if you paid for Freon which is super expensive you got ripped off. It takes r134. And just cause you. Charged the system did you have the system tested. If not tested by a good hvac shop you may have clogged filters or other issues including your bad controls. Also it may have leaked out again if there is a leak
Feel the hoses going into the heater on the firewall. If one is hot and the other is cool, then the heater control valve is not working for whatever reason. Check the flow valve.
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