No need to raise the center of gravity in you car. The cooling system is pump driven and under a lot of pressure (try taking off the rad cap when its hot). if your heater out put is poor, you may need to flush the heater core (run some rad flush for 20 mins, drain then disconect the heater hoses from the block, put a hose on the drivers side and flush (pushing the crud out in the opposite direction to regular water flow - or pull the heater box and take it to a rad shop), then 'burp' the air from the system. To burp the system (after flushing the heater core) fill with coolant, run the car to op temp. stop engine, top up rad, then squeeze the rad hoses a few times (really quickly to force the water around) top up the rad again, run motor for a few mins and check/top up when cool. Beaner7102