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Generally there are two types of
one type fits directly into the inlet manifold and the other is mounted independent of the engine connected by a vacuum pipe to the inlet manifold. I take it you checked the valve clearances before starting the engine. With adjustable type tappets you normally need to re-adjust them after a few miles driving. It may also be prudent to check the torque of the camshaft bearing bolts just in case.
Regarding the heater situation Renaults are notorious for air locking and it may take numerous attempts at bleeding the system to ensure good circulation.
Currently in madnoel10's garage:
Honda Civic 1.4l