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look for the t-stat being bypassed with heater hose or the plumbing configuration somehow. Easy test is feel top rad hose from cold start up, is temp cold till t-stat begins to open or does temp come up before hand. With a cold system you should be able to feel where heat is coming from if you consider system as 2 sides. 2 sides are those on each side of t-stat and should be that cut n dried.
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