94'100,2.0. Luke warm heater?

hello, grateful of any advice. Have recently changed thermostat and now runs at 90c all good. heaters will not produce anything hotter than luke warm no matter what i do?
car is standard equip no air con. any ideas? thanks, andy (a bit cold!)
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doubt if anyone reads this but i back-flushed then forward-flushed matrix about 25 times until equal flow appeared took about 30 mins to do. now heater is excellent! piece of cake! andy.
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