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Help with coolant system issue on 2008 Mazda 6 GH1
I’d like to do a full coolant flush of my GH1 Mazda6. I have sourced the correct P-OAT coolant that is free of silicates, nitrites, borates and amines. I intend to flush and reverse flush radiator and engine block using radiator hoses and garden hose. But I also want to flush the heater core/matrix.
The inlet and outlet hoses on the heater core are quite far back in the engine well, up against the firewall and its quite difficult to access the clamps. I was hoping to attach some 5/8 vinyl aquarium hose to them to flush out the core. Then once the system is clean, using the vinyl hoses, top up the heater core with 50/50. Then fill the rest of the system.
Does anyone have any advice on flushing the heater core in light of the difficult to access inlet/outlet hoses. Also, can anyone confirm which is the inlet and outlet? There is this black box sitting directly in the way that I’d like to move (see pic) to give a little more working room. Anyone know what it is? Alarm maybe?
Help with coolant system issue on 2008 Mazda 6 GH1
