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One thing to check is the inside of the heater control valve, if that vehicle has one. In my old FJ55, there was minimal heat output and it turbs out the valve was almost totapply clogged inside. A new valve and it put out heat like no tomorrow. Also, while the system is open, shove a garden hose nozzle up the heater hoses and back and forward flush the heater core (both inlet and outlet lines open). You'll be surprised at the gunk that can get flushed out of there. And finally, be sure there are no air pockets in the system. If you hear a gurling or whooshing sound when you rev the ending with the heater valve open, there may be air trapped in the system. Bleed that out and get it totally full.
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