It's possible that it is partially restricted, and at higher engine speed / pump pressure some coolant then gets thru. But that much potential clogging debris should be evident inside the radiator as viewed through the cap opening.
I suppose that if the coolant system was never serviced and the system is that mucked-up or ran w/o anti-freeze protection, it's possible that you have clogging.
'99 Grand Vitara JLX, 2.5L V-6, 4WD, 5 spd std, '00 "Limited" leather interior.
'53 Chevy 3100 Pick-up w/327 SB, TH400 trans w/78' Nova rear end.
'03 Honda Odyssey (Momma's ride)
'72 Chevy Nova. One owner, SB, A/C, power disc/drum & steering.
When engine first gets up to temp after a couple of minutes, when I put the fan switch to defrost all the way to the right, the temp control is basically meaningless. It pumps out fully hot air only, regardless of where the temp control is at.
Once the engine has been on for maybe a half-hour or more, the reverse is true. It only is cold-ish and never gets "hot" unless I put the temp control fully to the right detent which is full hot. Then I get all hot. So it's either all hot, or cold-ish...no mixing.
Your issue is different - the mixing is done using "blend doors" in the heater plenum, your's are not moving correctly - the plenum is behind the dash in the center, stick your head underneath and slide the temp control backward & forward, you should see where the other end of the cable connects, check the linkage and make sure it's working properly.
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